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  1. U

    Heterodyne detection, non-linear mixer and minimum detectable signal (2-way radar)

    I can make measurement with corner reflector, but this empirical approach won't get me meaningful information. If I could figure out whether I have enough power to achieve the required minimum SNR, I would continue with test. As you rightly pointed out, there are too many variables involved.
  2. U

    Heterodyne detection, non-linear mixer and minimum detectable signal (2-way radar)

    I've been working on a transceiver system with BGT24LTR11 chips at it's core and I was unable to achieve necessary signal to noise ratio. I want to know whether it's theoretically possible and for that I need to understand how the terms in the title all intertwined. The following...
  3. U

    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.
  4. U

    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 triggered by that function. Can someone point me to a resource (website, book, journal, etc.)...
  5. U

    [SOLVED] 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 sensitive. I'm not sure this makes sense to me.
  6. U

    [SOLVED] 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 how well it behaves as a detector and I need to find it's TSS for that. All what's specified in the...
  7. U

    [SOLVED] 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.
  8. U

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

    https://imgur.com/aW3aDLV 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, triggered on the falling edge of oscillator logic by a circuit with two MOSFETs, several resistors and one MOSFET...
  9. U

    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.
  10. U

    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".
  11. U

    [SOLVED] Impedance matching in ADS encountering error!

    I'm having exactly the same question... What the hell is P1?
  12. U

    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 looking towards antenna. If you change your port 1 impedance to 93-13j, your circuit will be matched...
  13. U

    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 match 100-34j at different thickness (we use 20 mil instead of 10 mil). We got the boards today and...
  14. U

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

    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 and tuned my circuit accordingly. I did however ran into issue of running this structure at higher...
  15. U

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

    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 response shifts right but it also introduces a 1-2 dB ripple in passband.
  16. U

    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.
  17. U

    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 Momentum, use appropriate ports but my -3dB corner now shows at 22.8, that is, I am off from circuit...
  18. U

    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.
  19. U

    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 line, other than using a resistor?
  20. U

    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 with non-radiating microstrip/vias. Would putting 50Ω RF resistor work too? Resistor would add...

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