WEBVTT 00:00.240 --> 00:07.120 This is three video series on single diode mixer design and its optimization using Microwave Office. 00:07.320 --> 00:14.080 In this video, we are going to create the matching network between bias diode circuit and RF isolator 00:14.080 --> 00:14.560 circuit. 00:14.560 --> 00:20.240 And in the second section of this video we are going to design the RF isolator circuit using Wilkinson 00:20.240 --> 00:21.040 Power combiner. 00:21.080 --> 00:22.200 So let's get started. 00:22.200 --> 00:27.400 In the first step of this video we are going to download the demo files using the link given in the 00:27.400 --> 00:31.720 description and open our design environment from your start menu. 00:31.720 --> 00:34.400 Then we'll go to File Open Project. 00:34.920 --> 00:37.480 In my case I have saved the file on desktop. 00:37.760 --> 00:41.720 Select the single diode mixer amp file and click on open button. 00:41.720 --> 00:47.600 So if I recall it from previous tutorial till here we have designed the DC bias circuit for a diode. 00:47.600 --> 00:52.080 In the next step we are going to create the matching circuit for the diodes input port. 00:52.120 --> 00:54.520 To do that first we are going to create a new schematic. 00:54.520 --> 00:57.840 So go back to your project panel circuit schematic. 00:57.840 --> 01:04.560 Right click click on new schematic I'm going to name it Matching circuit and click over create button. 01:04.640 --> 01:09.280 Now here we are going to place the Subcircuit block from the diode bias circuit module. 01:09.320 --> 01:11.560 To do that just click on this Subcircuit block. 01:11.640 --> 01:15.720 Now from here make sure you have selected the Diode biasing and click on okay button. 01:15.720 --> 01:18.280 And next we are going to assign the ports to it. 01:18.360 --> 01:23.920 So first before designing the matching circuit I just want to run the simulation for return loss. 01:23.920 --> 01:30.600 So from that we can able to visualize the ports are not matched to 50 ohm. 01:30.640 --> 01:32.040 We'll place another port here. 01:32.080 --> 01:36.160 Now to plot the S1 one parameter we need to create a new graph. 01:36.160 --> 01:41.520 But before that I want to set the frequency for this project so that it will simulate for the input 01:41.520 --> 01:44.360 frequency which is 4.25GHz in our case. 01:44.360 --> 01:44.680 Right. 01:44.720 --> 01:49.840 So instead of assigning the frequency or a single point frequency to the entire project, I'm going 01:49.840 --> 01:51.840 to assign it for a for the schematic. 01:51.840 --> 01:53.680 So right click go to options. 01:53.840 --> 01:57.440 Now here we'll just uncheck this use project defaults. 01:57.960 --> 01:59.200 Click a single point. 01:59.480 --> 02:03.160 Make it 4.25GHz and click on okay button. 02:03.160 --> 02:05.160 So now the frequency single point is set. 02:05.200 --> 02:07.600 Next we are going to create the new graph. 02:07.600 --> 02:12.200 To do that you'll simply click over this Create or Add New Graph button. 02:12.200 --> 02:15.200 Now I'm going to name it let's say s11 RF. 02:16.320 --> 02:21.000 Make sure it should be selected at Smith Chart and click over create button. 02:21.000 --> 02:22.480 Now I'm going to add the measurement. 02:22.520 --> 02:24.760 To do that we'll just simply right click here. 02:24.800 --> 02:26.240 Go to add new measurement. 02:26.240 --> 02:29.600 From here you have to go to linear then port parameters. 02:29.600 --> 02:33.600 Then make sure you've selected S here and source will be matching circuit. 02:33.600 --> 02:34.640 So let's select that. 02:34.640 --> 02:36.400 We are going to plot for S1 one. 02:36.440 --> 02:37.920 So it's also selected. 02:38.000 --> 02:42.720 And we are going to plot for a complex number so that it will have some real and imaginary number. 02:42.720 --> 02:47.720 But from that from Smith chart we can easily see if it will be not at the center line. 02:47.720 --> 02:52.240 Then there will be some impedance mismatch and we are going to tune that using a matching network. 02:52.240 --> 02:54.440 Click on okay and run analysis. 02:55.400 --> 03:01.280 So as you can see at 4.25GHz we have this location on Smith chart. 03:01.320 --> 03:07.680 If I'm going to check the real and imaginary value on that, we can simply add marker and we can clearly 03:07.680 --> 03:13.480 see the real part is 0.5338 and imaginary part is 0.418. 03:13.520 --> 03:16.160 Ideally, we want this point at the center line. 03:16.160 --> 03:21.000 Then our input impedance will be matched to port impedance which is 50 ohm. 03:21.040 --> 03:21.320 Right. 03:21.360 --> 03:25.960 And input impedance I'm talking about the input impedance of a diode bias circuit. 03:25.960 --> 03:32.360 So here we are going to use single step matching technique to match the input port to diode circuit 03:32.360 --> 03:34.280 at 4.25GHz. 03:34.280 --> 03:36.800 Create a single stub matching network. 03:36.800 --> 03:41.800 First we are going to add the microstrip line in series to the input port of the subcircuit. 03:41.800 --> 03:44.960 Let's go back to our matching circuit schematic. 03:44.960 --> 03:47.000 Go to elements from elements. 03:47.120 --> 03:52.320 You have to search for microchip, and from here we'll just select our line and search for Emlin. 03:52.760 --> 03:58.800 So let's select this Emlin drag and drop here we'll make some space, delete this connection and place 03:58.800 --> 04:01.480 it in series with the port. 04:04.280 --> 04:08.600 Now the microstrip line should have some sort of substrate definition, which should be exactly similar 04:08.600 --> 04:09.960 as your PCB. 04:10.000 --> 04:10.360 All right. 04:10.400 --> 04:13.680 To do that I'm just going to define a global definition of the substrate. 04:13.680 --> 04:16.200 So we'll just go to global definition double click here. 04:16.200 --> 04:18.680 And here we are going to add the substrate element. 04:18.680 --> 04:20.520 Again go back to your element panel. 04:20.800 --> 04:23.960 Here you have to search for substrate I'm just going to close it. 04:24.080 --> 04:25.240 Search for substrate. 04:25.920 --> 04:28.000 Select that and place Msub. 04:30.280 --> 04:33.600 All right I'm going to zoom out a bit. 04:33.640 --> 04:34.200 Here we go. 04:34.200 --> 04:37.160 Now we are going to add the parameters of Msub. 04:37.160 --> 04:38.440 So I'll just double click here. 04:38.560 --> 04:40.880 Now er in our case will be 2.2. 04:41.240 --> 04:45.920 Height of the substrate will be 0.787. 04:45.960 --> 04:49.200 Thickness of copper will be 35 micron. 04:49.200 --> 04:51.000 So it will be 0.035. 04:51.160 --> 04:56.440 And then tangent loss will be 0.0007. 04:56.640 --> 04:58.200 This will be 2.2 as well. 04:58.400 --> 04:59.960 And the name should be sub one. 05:00.120 --> 05:01.280 We'll click on okay. 05:01.560 --> 05:02.840 And here we go. 05:02.880 --> 05:09.880 Now we'll just save the project, go back to project and go back to our schematic which is matching 05:09.880 --> 05:10.400 circuit. 05:10.560 --> 05:14.720 Now here we have to assign the substrate to this microstrip transmission line. 05:14.760 --> 05:18.520 To do that we'll just double click on that click on MSB. 05:18.520 --> 05:20.880 And from here make sure selected sub one. 05:20.880 --> 05:24.800 So we have automatically assigned the properties from the substrate to this microstrip line. 05:24.840 --> 05:27.160 Next we are going to define some variables. 05:27.160 --> 05:33.360 So let's say the width of the substrate will be the w 50 ohm. 05:33.360 --> 05:36.640 So that will calculate using the transmission line tool. 05:36.680 --> 05:37.600 I'll show you later. 05:37.720 --> 05:41.720 And let's make the length another variable which will be L line. 05:41.720 --> 05:43.640 And this is what we are going to tune. 05:43.640 --> 05:45.440 So we'll just set some initial value. 05:45.440 --> 05:47.080 And later on we'll tune that. 05:47.080 --> 05:51.440 And similarly we'll just place these variables here as an equation. 05:51.560 --> 05:58.160 Now before doing that I'm just going to calculate the value of the width using the substrate parameters. 05:58.160 --> 06:00.160 So we'll go to tool transmission line. 06:00.160 --> 06:02.000 And here we are going to change the properties. 06:02.000 --> 06:04.400 So make sure the dielectric constant should be 2.2. 06:04.440 --> 06:11.440 It's the same value which you have set for the substrate conductor should be copper frequency 4.25GHz. 06:12.120 --> 06:13.240 Uh, yeah. 06:13.280 --> 06:13.760 Impedance. 06:13.760 --> 06:16.280 We are looking for 50 ohm. 06:16.320 --> 06:17.320 This doesn't matter. 06:17.480 --> 06:18.560 Height should be this. 06:18.640 --> 06:22.160 And the thickness we want is 0.035. 06:22.480 --> 06:23.920 Make sure it should be selected as. 06:23.960 --> 06:25.800 Mhm. 06:25.840 --> 06:28.880 So then this will be 0.035. 06:28.920 --> 06:29.560 All right. 06:29.560 --> 06:30.960 And then we'll calculate it. 06:31.080 --> 06:34.640 So the calculated width is 2.38mm. 06:34.840 --> 06:35.360 Right. 06:35.360 --> 06:38.920 And if we'll do that for the substrate we'll get the impedance of 50 ohm. 06:38.960 --> 06:43.320 So let's remember that now we are going to create the equations. 06:43.680 --> 06:45.800 So we'll just click on this equation button. 06:45.840 --> 06:46.840 Let's place it here. 06:47.360 --> 06:51.720 So w 50 will be 2.38. 06:52.160 --> 06:53.240 Copy and paste. 06:54.680 --> 06:59.720 Next equation will be for the length of the line which is L line. 07:00.280 --> 07:03.600 For now I'm just making it 16.85mm. 07:04.000 --> 07:09.960 Why so specific that we'll see later, but this is a tunable parameter which will tune to make sure 07:09.960 --> 07:16.320 that the impedance or the input impedance of the diode bias circuit should be 50 ohm. 07:16.360 --> 07:16.880 All right. 07:16.920 --> 07:20.000 So for now I'll just leave it 16.85. 07:20.360 --> 07:24.320 Next we are going to add the stub next to this microstrip transmission line. 07:24.360 --> 07:25.960 To do that we'll go to elements. 07:26.280 --> 07:32.280 And instead of placing the sub we'll just go to again microstrip line. 07:34.640 --> 07:36.000 Select line from here. 07:36.000 --> 07:38.880 And if you scroll down you'll find MLF. 07:39.040 --> 07:44.520 So if you check the description of that this is an open microstrip line with an end effect. 07:44.520 --> 07:48.200 So this is a stub which we are going to place it here. 07:48.200 --> 07:49.600 I'm just going to connect it. 07:49.840 --> 07:55.160 And as you can see the substrate for this stub transmission line is a sub one. 07:55.160 --> 07:58.160 This is the same substrate which we have created a couple of minutes ago. 07:58.160 --> 08:03.560 And now the width of the transmission line will be same as the 50 ohm width which we have calculated 08:03.560 --> 08:04.960 using the transmission line tool. 08:05.240 --> 08:08.680 Line of the of the substrate will just make it another variable. 08:09.080 --> 08:11.960 Let's make it elstub. 08:12.000 --> 08:13.720 And we'll copy paste here. 08:14.160 --> 08:17.840 So this is another tunable parameter which we are going to tune. 08:18.160 --> 08:21.360 For now I'm just placing the value here which is the exact value. 08:21.400 --> 08:24.840 We want to make it time efficient. 08:24.880 --> 08:26.440 Let's make it 19.5. 08:26.560 --> 08:31.720 Now we are going to run the simulation again and see if it is match to 50Ω or not. 08:31.800 --> 08:32.840 So we'll run the analysis. 08:32.840 --> 08:36.440 And as you can see the imaginary part is almost zero. 08:36.760 --> 08:38.800 And it is on the line right. 08:38.840 --> 08:40.640 So the impedance is 50 ohm. 08:40.680 --> 08:47.120 Now how this you have to do from scratch because I got these values L and L line from the tuning. 08:47.200 --> 08:49.760 So you can just create the tunable parameter for yourself. 08:49.800 --> 08:52.080 And just click on this tune tool. 08:52.320 --> 08:53.840 Select these two variables. 08:54.120 --> 08:58.000 Go back to your plot and click on this tuner. 08:58.000 --> 09:02.480 Here you can see the lowest value is set to 9.75. 09:02.600 --> 09:06.160 Maximum value is set to let's say 39 right. 09:06.200 --> 09:06.840 So you So you can just. 09:06.880 --> 09:07.600 Yeah check it. 09:07.600 --> 09:10.040 And as you can see it's moving right. 09:10.080 --> 09:12.920 Similarly you can move it in this direction. 09:12.960 --> 09:13.200 All right. 09:13.240 --> 09:20.560 So as you can see on this particular value only you can able to place it correctly at the center line. 09:20.600 --> 09:21.040 All right. 09:21.080 --> 09:26.320 So you can just go through with this and play along with these tunable parameters and see if you can 09:26.320 --> 09:28.640 able to match it to 50 ohm or not. 09:28.680 --> 09:29.160 All right. 09:29.200 --> 09:30.640 So this is what I did. 09:30.680 --> 09:37.280 And from that I got these values 19.5 and 16.85. 09:37.320 --> 09:40.600 So if I just enter here it is correctly matched right. 09:40.640 --> 09:42.400 So our matching circuit is ready. 09:42.440 --> 09:47.680 Next we are just going to create an independent matching circuit which we can use it as a sub circuit 09:47.680 --> 09:49.840 when we'll be creating the mixer connection. 09:49.880 --> 09:50.200 All right. 09:50.240 --> 09:52.360 At later stage we will be creating the mixer circuit. 09:52.360 --> 09:55.720 We'll be using all these schematic which we have created right. 09:55.760 --> 10:04.720 So to do that I'm just going to create a new schematic and let's name it RF Match Network and click 10:04.720 --> 10:05.680 on create button. 10:05.720 --> 10:08.270 We'll just copy our matching circuit here. 10:08.550 --> 10:09.830 So I'll just copy it. 10:09.950 --> 10:17.830 Ctrl c, go back to RF match network Ctrl V and we'll just delete this diode circuit block. 10:18.550 --> 10:19.070 There we go. 10:19.270 --> 10:24.110 So this is our independent matching circuit which we can use as a sub circuit. 10:24.150 --> 10:24.310 Right. 10:24.310 --> 10:25.630 Because it's a two port network. 10:25.630 --> 10:29.590 In the next step we are going to design a RF isolation circuit. 10:29.590 --> 10:34.470 So there are different type of isolator circuit or network or structure are possible. 10:34.470 --> 10:37.750 So we can use to isolate two input ports. 10:37.750 --> 10:43.310 But in this case we are simply going to use power combiner structure as an RF isolator. 10:43.310 --> 10:44.990 So first we will just create a new schematic. 10:45.030 --> 10:46.230 Go to your project panel. 10:46.230 --> 10:47.470 Right click on schematic. 10:47.470 --> 10:48.510 Click on new schematic. 10:48.510 --> 10:53.190 We are going to name it RF isolator and click on create button. 10:53.190 --> 10:55.590 Then we'll go back to elements from elements. 10:55.590 --> 10:58.150 We have to go to microstrip line here. 10:58.150 --> 11:00.830 Instead of selecting the line we'll select Power Divider. 11:00.830 --> 11:04.270 And here we have this Wilkinson Power splitter and divider. 11:04.310 --> 11:07.550 We'll just select this will key one. 11:07.670 --> 11:08.830 We'll just drag and drop. 11:09.230 --> 11:10.350 Rotate it like this. 11:11.910 --> 11:13.390 Now to edit the parameters. 11:13.510 --> 11:16.390 The width of this Wilkinson divider will be 50 ohm. 11:16.630 --> 11:19.910 So we'll make it w 50. 11:19.950 --> 11:24.630 This is the branch length so we'll just make it WB later assign the parameters to it. 11:24.750 --> 11:27.790 Length will be we call it quad length. 11:27.790 --> 11:33.110 So we'll just name another parameter here L quad R will be 100 and substrate will be sub one. 11:33.150 --> 11:37.710 Next we are going to define all the equations or the values to these variables. 11:37.870 --> 11:41.110 So w 50 as we have calculated it was 2.38. 11:42.990 --> 11:44.150 Copy and paste. 11:45.270 --> 11:48.190 WB will be 1.34. 11:49.910 --> 11:53.710 You can simply calculate that based on the impedance of 15 root two. 11:53.750 --> 11:54.070 All right. 11:54.070 --> 11:56.510 So you can just go back to your tool. 11:56.510 --> 11:59.510 Enter the the value of impedance 50 root two. 11:59.550 --> 12:02.150 And based on that the width will come out 1.34. 12:02.310 --> 12:03.950 And L quad will be lambda by four. 12:04.230 --> 12:08.030 So we'll just copy paste here. 12:09.830 --> 12:14.510 just name it El Quad and its value will be 14.8. 12:16.310 --> 12:16.630 Right. 12:16.670 --> 12:18.590 So this is the parameter which we need to tune. 12:18.670 --> 12:20.830 So I'm just putting a rough value here. 12:22.030 --> 12:23.350 And this will be WB. 12:23.710 --> 12:25.710 So we have entered all these parameters. 12:25.750 --> 12:27.350 Next we are going to add ports. 12:27.510 --> 12:28.670 So port will be. 12:28.670 --> 12:30.150 So this will be first port. 12:30.150 --> 12:31.910 And I will just copy paste this one. 12:33.110 --> 12:34.630 This is second port. 12:36.990 --> 12:37.150 Okay. 12:37.190 --> 12:40.230 Don't go with these these uh numbers here. 12:40.270 --> 12:40.510 All right. 12:40.550 --> 12:42.430 I'm assigning just ports based on. 12:45.030 --> 12:47.630 The RF flow and RF flow parameters. 12:47.670 --> 12:50.910 So this will be our RF input, the port one. 12:50.910 --> 12:54.110 So I'll double click here and make this ID to RF. 12:55.510 --> 12:55.830 Right. 12:55.870 --> 12:56.750 Double click here. 12:57.030 --> 13:00.950 This will be our low input and the output will be RF plus a low. 13:00.990 --> 13:05.310 So let's make it RF plus low and click on okay button. 13:05.630 --> 13:10.470 Uh before going further I just want to arrange these ports Sports parameters a bit, so there will be 13:10.470 --> 13:12.950 no overlap and clearly see things. 13:13.030 --> 13:13.510 All right. 13:13.550 --> 13:17.150 Next we are going to plot the response and tune the alcohol. 13:17.470 --> 13:20.830 So to do that we are going to create the new plot. 13:20.910 --> 13:25.110 But before that I'm just going to add the frequency sweep on that. 13:25.350 --> 13:27.590 So we'll go to project right click here. 13:27.630 --> 13:29.190 Go back to options here. 13:29.230 --> 13:32.990 Make sure you have uncheck this use Project defaults. 13:32.990 --> 13:36.670 This will be our sweep and start frequency will be three gigahertz. 13:37.070 --> 13:40.390 Stop will be let's say 5.5GHz. 13:40.390 --> 13:44.070 And step size will be 0.05GHz will apply. 13:44.070 --> 13:46.070 And we can see there are 51 points. 13:46.070 --> 13:49.310 We are going to simulate and click on okay button. 13:49.350 --> 13:51.230 Next we are going to add the graph. 13:51.310 --> 13:53.510 Just click on this Add new graph button. 13:53.510 --> 13:57.950 Let's name it as parameter of RF flow. 13:58.790 --> 14:01.030 And this time this will be our rectangular plot. 14:01.070 --> 14:02.390 Click on create button. 14:02.390 --> 14:04.350 Right click add new measurement. 14:04.350 --> 14:07.350 Our measurement will be same port as parameters. 14:07.350 --> 14:10.910 From here we have to select the RF isolator this time. 14:11.310 --> 14:15.150 And so we are going to simulate for S21. 14:15.150 --> 14:16.710 So two port. 14:16.950 --> 14:18.710 And this will be port two. 14:19.070 --> 14:23.270 Make sure the amplitude will be in db and click on add if you want. 14:23.270 --> 14:28.350 You can also simulate for S11 but that's not required and we'll just close it. 14:28.670 --> 14:30.390 Next we are going to run the analysis. 14:30.630 --> 14:36.990 And as you can see there is this isolation of more than 50dB between the port one and two. 14:37.030 --> 14:39.390 But it is coming at certain frequency. 14:39.390 --> 14:40.950 So I'm just going to add a marker. 14:40.950 --> 14:46.470 Here it is at 3.552MHz. 14:46.470 --> 14:50.390 But in our case we want this at 3.75GHz. 14:50.390 --> 14:51.990 If we go back to our design notes. 14:52.110 --> 14:54.950 So the low frequency is 3.75GHz. 14:54.950 --> 14:58.590 And we want the isolation between these two ports at that frequency. 14:58.750 --> 15:01.470 So then that means we have to tune the parameter. 15:01.470 --> 15:04.070 So we'll go to our RF isolator circuit. 15:04.070 --> 15:05.550 And we have to tune the quad. 15:05.590 --> 15:08.590 So we'll just select this go back to plot. 15:08.750 --> 15:09.670 Open the tuner. 15:09.950 --> 15:13.550 and I'm just going to remove other tuners. 15:13.630 --> 15:17.270 So we'll just uncheck from here and keep the code. 15:17.470 --> 15:24.390 So from the tuning parameters the chord length which is coming close to 13.8. 15:24.390 --> 15:27.190 So we'll just we'll just go below. 15:27.990 --> 15:29.630 You can see it's moving in that direction. 15:29.630 --> 15:30.750 That is what we want. 15:31.030 --> 15:39.350 And at 13.8 the frequency will be pretty much if I just add another marker to this point. 15:39.710 --> 15:43.430 So as you can see this is approx 3.8GHz right. 15:43.470 --> 15:44.910 You can just tune it further. 15:44.910 --> 15:46.630 But again that's a time taking. 15:46.630 --> 15:53.230 And you can just increase the value up to some certain decimal and it will be fully matched. 15:53.270 --> 15:53.470 Right. 15:53.510 --> 15:58.910 So we want this notch ideally at 3.75GHz which is here right. 15:58.950 --> 16:05.270 And the isolation between port one and port two at this frequency is approx 50dB. 16:05.310 --> 16:05.710 Right. 16:05.750 --> 16:06.950 So we'll just close it. 16:06.950 --> 16:08.590 So that's it for the isolation circuit. 16:08.630 --> 16:13.150 Next we are going to add everything together to create the mixer circuit for simulation. 16:13.230 --> 16:15.590 Next we are going to create the mixer circuit. 16:15.630 --> 16:18.150 To do that, we'll again go back to our project panel. 16:18.270 --> 16:19.710 Right click and create new Schematic. 16:19.710 --> 16:23.750 I'm just going to name it mixer and click on create button. 16:23.790 --> 16:29.830 Now here, if you recall that our mixer circuit consists of three blocks flow isolator matching network 16:29.830 --> 16:30.990 and diode biasing circuit. 16:30.990 --> 16:33.230 And all the three blocks we have created here. 16:33.270 --> 16:33.590 Right. 16:33.630 --> 16:37.950 So we'll just add our first sub circuit which will be our flow isolator. 16:38.350 --> 16:41.830 So we'll just place it here I'm just going to rotate it. 16:41.990 --> 16:45.430 So here we have this RF flow and RF flow output. 16:45.430 --> 16:47.670 This will go to our matching network. 16:47.990 --> 16:51.670 So we'll place another sub circuit that will be our matching circuit. 16:51.750 --> 16:52.110 Alright. 16:52.150 --> 16:57.150 So make sure you are using the independent matching circuit that we have created without diode. 16:57.190 --> 16:57.590 Right. 16:57.630 --> 16:58.630 We just place it here. 16:58.630 --> 17:01.710 And next we are going to add the diode bias sub circuit. 17:01.870 --> 17:05.030 So we'll click on Diode biasing and click on okay. 17:05.350 --> 17:05.870 Here we go. 17:05.870 --> 17:09.430 So this is our mixer circuit I'm just going to connect all these ports. 17:09.590 --> 17:14.270 In the next step we are going to add input and output ports to this mixer circuit. 17:14.310 --> 17:16.630 To do that, we will again go back to elements. 17:16.790 --> 17:23.030 From elements, we'll go to ports and select harmonic balance ports from the harmonic balance port. 17:23.070 --> 17:27.390 I'm going to add the one tone HB source right. 17:27.430 --> 17:29.390 So we'll just place it on. 17:31.470 --> 17:34.230 So first port I'm going to assign to RF. 17:34.230 --> 17:36.830 So just rotate it right. 17:36.870 --> 17:41.390 Then I'm going to add the output port which will be port number two. 17:41.830 --> 17:48.150 And then I'm going to add just copy this place another harmonic balance port at the L0. 17:48.190 --> 17:49.670 That will be our port three. 17:49.990 --> 17:52.910 Next we are going to configure the parameters of these ports. 17:53.110 --> 17:56.230 But before that I'm just going to set the frequency of the project. 17:56.230 --> 17:58.990 So let's go back to the schematic right click option. 17:59.390 --> 18:04.510 We are going to run the simulation for a single point frequency which is an input frequency of RF signal 18:04.510 --> 18:06.470 which is 4.25GHz. 18:06.590 --> 18:07.430 And click on okay. 18:07.950 --> 18:11.350 So that will be the frequency of this RF port. 18:11.550 --> 18:17.550 Now to set the frequency of the yellow port, we have to double click on this and go to port parameter. 18:17.750 --> 18:21.110 From here let's say second tone and click on okay. 18:21.110 --> 18:23.110 Now as you can see we are getting the frequency option. 18:23.110 --> 18:25.150 Here it is in megahertz. 18:25.310 --> 18:28.350 And the low frequency is 3.75GHz. 18:28.350 --> 18:31.470 So it will be 3.750MHz. 18:31.470 --> 18:35.070 And the low power I'm just going to make it a variable. 18:35.070 --> 18:40.990 So let's make it yellow which we are going to tune when we'll see the spectrum or when we plot for spectrum, 18:40.990 --> 18:45.230 we'll just tune the power yellow and see what is happening in the amplitude of the signal. 18:45.390 --> 18:48.070 And similarly we are going to define this variable here. 18:48.230 --> 18:50.710 For now I'm just going to make it zero DBM. 18:50.710 --> 18:54.510 So p underscore low will be zero. 18:54.550 --> 18:55.070 All right. 18:55.190 --> 18:57.630 So that's pretty much for this video. 18:57.630 --> 19:02.830 In the next video we are going to simulate this and see the spectrum of this mixer output. 19:02.830 --> 19:08.670 And later we'll optimize that spectrum by changing the PLO power and adding some bandpass filter to 19:08.670 --> 19:11.790 remove all the extra frequencies, which is not required. 19:11.830 --> 19:12.030 Right. 19:12.070 --> 19:13.350 So that we'll discuss in next video.