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Type: Posts; User: usx

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1. ## Thread: Magnitude function analog circuit (square root of sum of two squares)

by usx
Replies
3
Views
332

### Closed: Re: Magnitude function analog circuit (square root of sum of two squares)

By 10% duty cycle I mean that the my I&Q signals are on for 10% of the time. I'll see what happens when I multiply I by Q.
2. ## Thread: Magnitude function analog circuit (square root of sum of two squares)

by usx
Replies
3
Views
332

### Closed: Magnitude function analog circuit (square root of sum of two squares)

I have output of quadrature mixer and I need it's magnitude for current application. I want to build a circuit that does A = sqrt(I^2+Q^2), and it should also have duty cycle of 10%, so it should be...
3. ## Thread: How to estimate TSS of a mixer+LNA given noise figure and voltage conversion gain?

by usx
Replies
3
Views
672

### [SOLVED]Closed: Re: How to estimate TSS of a mixer+LNA given noise figure and voltage conversion gain

Thanks for answering. I'm looking at TSS figure you've calculated and can't make sense of it. A really good Schottky diode will have TSS of -60 dBm and this implies this device is 30 dB more...
4. ## Thread: How to estimate TSS of a mixer+LNA given noise figure and voltage conversion gain?

by usx
Replies
3
Views
672

### [SOLVED]Closed: How to estimate TSS of a mixer+LNA given noise figure and voltage conversion gain?

https://www.infineon.com/dgdl/Infineon-BGT24LTR11N16-DS-v01_03-EN.pdf?fileId=5546d4625696ed7601569d2ae3a9158a

I'm evaluating BGT24LTR11 RF transceiver and I want to do theoretical calculation of...

by usx
Replies
4
Views
441

### [SOLVED]Closed: Re: Modulation scheme of this pulsed/two-frequency radar system

Apologies for this thread, I have triggered oscilloscope to output, not delta f so there were two waves on top of each other. There's just one downconverted signal, all is explained.

by usx
Replies
4
Views
441

### [SOLVED]Closed: Modulation scheme of this pulsed/two-frequency radar system

153672

I'm trying to figure out how does this radar system works. Transmit Gunn diode is driven by mixing oscillator logic 3% duty cycle pulse with delta f logic,...
7. ## Thread: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

by usx
Replies
11
Views
1,015

### Closed: Re: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

Yes, spectrum looks clean, there's one CW tone, problem is with power.
8. ## Thread: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

by usx
Replies
11
Views
1,015

### Closed: Re: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

I measured power at CW. As for other topic, I had port type set to "Direct" instead of "Transmission Line".

by usx
Replies
3
Views
501

### [SOLVED]Closed: Re: Impedance matching in ADS encountering error!

I'm having exactly the same question... What the hell is P1?
10. ## Thread: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

by usx
Replies
11
Views
1,015

### Closed: Re: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

Port 2 is known to be 50 Ohm, port 1 is unknown it is not "set to 50 ohms"; it can be set to 100 ohm or 200 ohm. If port 1 is before taper (connected to MS2 on your setup), then it sees 93-13j...
11. ## Thread: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

by usx
Replies
11
Views
1,015

### Closed: Re: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

According to my simulation using ADS Momentum, output impedance was 100-34j Ω. I made assumption that it will not change if I change dielectric thickness, and I scaled their matching structure to...
12. ## Thread: Keysight ADS significant discrepancy between circuit simulation and Momentum 11 GHz!

by usx
Replies
6
Views
1,133

### Closed: Re: Keysight ADS significant discrepancy between circuit simulation and Momentum 11 G

Yes, I set metal to 17 microns. I added a 50Ω feed line. I set both ports to TML using edge pin. I also kept seeing that my Momentum is consistently off by 5-5.6 GHz from ADS circuit so I adjusted...
13. ## Thread: Keysight ADS significant discrepancy between circuit simulation and Momentum 11 GHz!

by usx
Replies
6
Views
1,133

### Closed: Re: Keysight ADS significant discrepancy between circuit simulation and Momentum 11 G

Thanks, I've corrected my setup. Now, circuit setup is off from Momentum by 3-5 GHz. Now I'm struggling to tune the values for ADS layout; when I change values of high impedance elements, frequency...
14. ## Thread: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

by usx
Replies
11
Views
1,015

### Closed: Re: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

I've used MOM simulator to analyze this matching structure and it showed a reactive component in addition to real 110Ω impedance. I'll look through my files and attach a setup here later today.
15. ## Thread: Keysight ADS significant discrepancy between circuit simulation and Momentum 11 GHz!

by usx
Replies
6
Views
1,133

### Closed: Keysight ADS significant discrepancy between circuit simulation and Momentum 11 GHz!

I'm designing a basic stepped impedance LPF, with -3dB at 34GHz. I simulated it with transmission lines first, then with microstrip lines. I get -3dB at 34GHz, as expected. Next, I import it into...
16. ## Thread: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

by usx
Replies
11
Views
1,015

### Closed: Re: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

Sounds about right but if you want to be more precise, you can use smith chart. I had a bit of reactance and real part was higher than 100Ω.
17. ## Thread: How to terminate microstrip line with Z0 = 50Ω?

by usx
Replies
4
Views
502

### Closed: Re: How to terminate microstrip line with Z0 = 50Ω?

My schematic consists of unterminated 50Ω microstrip line and I need to terminate it somehow with non-radiating element so no antenna.

- - - Updated - - -

There's no other wave to match 50Ω...
18. ## Thread: How to terminate microstrip line with Z0 = 50Ω?

by usx
Replies
4
Views
502

### Closed: How to terminate microstrip line with Z0 = 50Ω?

If I have a microstrip line with characteristic impedance of Z0 = 50Ω, how do I terminate it with 50Ω to ground? In the literature it's always assumed load exists but how do I implement it, ideally...
19. ## Thread: Keysight ADS - patch antenna input impedance (possible incorrect EM setup)

by usx
Replies
2
Views
560

### [SOLVED]Closed: Re: Keysight ADS - patch antenna input impedance (possible incorrect EM setup)

I placed a 100Ω line and terminated it with 100Ω sources on both sides and impedance changes significantly as I change the length. I checked the equations used for transmission line and my values are...
20. ## Thread: Keysight ADS - patch antenna input impedance (possible incorrect EM setup)

by usx
Replies
2
Views
560

### [SOLVED]Closed: Keysight ADS - patch antenna input impedance (possible incorrect EM setup)

I'm simulating a patch antenna array but I don't understand the output. Keysight ADS LineCalc and Rogers MWI-2019 were used for synthesis and ADS Momentum was used for far-field radiation/pattern...
21. ## Thread: Patch antenna "series-shunt" feed array impedance matching

by usx
Replies
3
Views
577

### Closed: Re: Patch antenna "series-shunt" feed array impedance matching

Yes, I measured output impedance out of leftmost patch and measured 177Ω, thank you.
22. ## Thread: Patch antenna "series-shunt" feed array impedance matching

by usx
Replies
3
Views
577

### Closed: Patch antenna "series-shunt" feed array impedance matching

I'm trying to understand how is attached feedline matched. Thin lines are 100Ω transmission line. Matching structure looks somewhat similar to one shown here:
...
23. ## Thread: Data acquisition hardware for a ~50 kHz signal to import it to PC/do FFT

by usx
Replies
3
Views
1,014

### Closed: Data acquisition hardware for a ~50 kHz signal to import it to PC/do FFT

As the title says, I have FMCW system and it outputs single-ended IF signal, frequency ranges from 1 kHz to 50 kHz (and a sync). Now, I want to capture it on PC, import it to Matlab and do an FFT or...

by usx
Replies
2
Views
773

### [SOLVED]Closed: Significant discrepancy between ADS and Momentum simulations

I designed a simple 90 degree branchline coupler in ADS, tuned it to my liking (my values were very close to theoretical). Now, I simulate the structure in Momentum and my curves are all off, I get 3...
25. ## Thread: Simulating X-band antenna in ADS Momentum, is it accurate to assume sheet metal?

by usx
Replies
1
Views
533

### Closed: Simulating X-band antenna in ADS Momentum, is it accurate to assume sheet metal?

Due to skin effect of 0.6 um, most of the current flows on the edge, so will it be a good idea to assume sheet metal to reduce simulation time drastically? I've simulated several single-patch...
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