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Recent content by vivekroy

  1. V

    TLIN (ADS) equivalent model in CADENCE VIRTUOSO

    There is the new RFTline library available in Cadence. Please see the link...
  2. V

    Center Tapped Transformer Model Command on Cadence, Synopsys

    You need four inductances and two mutual inductances LP1 in_p center_tap 0.25u LP2 center_tap in_n 0.25u LS1 out_p center_tap_s 0.25u LS2 center_tap_s out_n 0.25u K1 LP1 LS1 1 K2 LP2 LS2 1
  3. V

    What advice would you give?

    My advice: Perseverance. Do not expect that you will be given a ton of independence on day 0. People need to trust you before they will give you responsibility. One mistake on your part can cost a company millions. Read, read and read. There is no substitute for reading papers. Recreate the...
  4. V

    OP-Amp non linearity in verilog A model

    I am not going to edit your code for you. Sorry but that is not happening. You need to find the parameters of the third order equation that describes the non-linear behavior. For that you would need the input 1dB compression point in terms of voltage. Once you have that, you can get the...
  5. V

    What should be Vref in CMFB?

    Well, if you have two ideal current sources connected in series, and you are controlling the current through one of them, then you have an infinite gain amplifier. Throw in the output transconductance of the current sources, and you have a finite gain and then it should be fine.
  6. V

    How to make an inverter less sensitive to PVT variations?

    If it is a real variation, as opposed to a possible model issue described above, then your only solution would be to calibrate. 200fs is not trivial though.
  7. V

    Inverter output

    Charge feedthrough causes those spikes.
  8. V

    CMRR of 2 stage differential input and differential output op-amp

    You should short the inputs and connect it to a voltage source. Put in the appropriate DC voltage, put in AC Magnitude as 1 and sweep the frequency through an AC simulation. If there are no systematic mismatches, then Vo+ and Vo- will show identical output. Else you will see a difference in the...
  9. V

    Deep Nwell process in cadence 65nm (nmos_rf_6t)

    No, all three of them should be in the same well.
  10. V

    OP-Amp non linearity in verilog A model

    module opamp_nonlinear(in_p,in_n, out_p,out_n,vcm_out); voltage in_p, in_n,out_p,out_n,vcm_out; parameter real Rin = 50 from (0:inf]; parameter real Rout = 50 from (0:inf]; parameter real Gp_dB = 10 from [-100:100]; parameter real a2 = 0 from [0:inf]; parameter real IP1dB =0 from [-100:100]...
  11. V

    Deviation of dain current of PA between simulation and measurement

    How are you measuring the drain current in simulation? How are you measuring Pin in your lab measurements? Are you actually measuring the input power to your amplifier or is it the setting on your instrument? The reason I ask this is because your S11 is very poor.
  12. V

    Is there such a thing as an RF CMOS pdk?

    PDKs with RF ”devices” are normal transistors but with additional modelling like the substrate, a more exhaustive gate model etc. There are also more restrictions on how these devices can be placed.
  13. V

    [SOLVED] Type of probes required for HP1200B

    Yes, I do see that the inputs are differential. Please see the attached image and my reasoning behind using a single ended probe. It appears each of the terminals of the differential input can be turned off/ac coupled or dc coupled. Am I missing something obvious here?
  14. V

    [SOLVED] Type of probes required for HP1200B

    Thanks FvM. I did not follow the last line. Can you please explain it? A side query, it looks like the terminals of the differential input can be turned off (connected to GND) from the schematics. Do you reckon I can use single ended probes by turning it off?
  15. V

    [SOLVED] Type of probes required for HP1200B

    Folks, I have come to seek your help. I found this really old HP1200B oscilloscope. It was literally free. I got it. I am looking for probes for it. It does not appear to be using the standard BNC or SMA connector. Here is a picture. Can anyone tell me what type of connector is this?
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