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Recent content by ccw27

  1. C

    Help needed in UWB design

    Receiver or Transmitter or Synthesizer? I suggest you do some background reading and a good place to start is by reading IEEE JSSC and conferences such as RFIC and ISSCC.
  2. C

    Meaning of BJT Vce(sat)

    vcesat It seems Vce,sat is not equivalent to Vd,sat in MOS case. Or is it?
  3. C

    Meaning of BJT Vce(sat)

    vce sat Sorry I did not understand. BJT in saturation == MOS in triode. So if Vce exceeds Vce(sat) the BJT will be in active region?
  4. C

    Meaning of BJT Vce(sat)

    vce saturation voltage What is the meaning of Vce(sat)? If Vce(sat) of a BJT is 0.6V does it mean that the Vce must exceed 0.6V to ensure the transistor is in active region? Thanks
  5. C

    LNA differential as single ended

    I am talking about both simulation and measurement. However, I don't see this in spice simulation. So the gain and NF seem to vary with the impedance connected on the AC ground path. I believe the causes are mutual inductance, coupling between the differential inputs and non-ideal ground. Any...
  6. C

    LNA differential as single ended

    One of the input of the LNA is bypassed using a capacitor to ground, the other one is matched to 50 ohms. The gain is dependent on whether I add a 50 ohms in series with the bypass capacitor. Without 50 ohms I see Differential Gain -6dB, with 50 ohms I see Differential Gain -3dB.
  7. C

    LNA differential as single ended

    I think I should clarify. I would like to obviate the need of a balun so for a differential input LNA, I connect one of the input to AC ground whereas the other input is matched to 50 ohms. From the measurement I found out that the AC grounded input also needs to be connected to a 50 ohms to get...
  8. C

    LNA differential as single ended

    I am simulating a differential LNA as single-ended by connecting one of the input to AC ground. When running Pnoise I see noise contribution from transistors in the AC ground path. How is that possible?
  9. C

    idc temperature coefficient

    I did a fitting of my circuit bandgap current in matlab. Basically I exported the current data to matlab and fit the data into a second order equation. Then you can use idc component in analogLib and enter the dc current, tc1 and tc2. Overall it fits pretty well with the actual circuit, maybe...
  10. C

    idc temperature coefficient

    cadence temp temperature Hi, How does the temperature coefficient work for idc component in analoglib of cadence? I am trying to emulate a ptat and a bandgap current using this component. Thanks Added after 41 minutes: I got it I=Inom*(1+TC1(T-Tnom)+TC2(T-Tnom)² Does anyone know a smart...
  11. C

    RF receiver Input Matching

    I am measuring the RF receiver without any input matching and see a very noisy downconverted signal instead of a single tone. Is the circuit oscillating? How do I determine whether the circuit is oscillating or not? Thanks
  12. C

    Estimating Metal Line Capacitance per unit area

    Hi, How do I calculate or estimate roughly the metal line capacitance per unit area? Someone told me it is roughly 1fF/um² in modern process. Anyone? Thanks
  13. C

    DEEP nWELL for negative voltages

    deep n-well in mixed signal layout Is ok for 2 NMOS to share N-Well instead of connecting two N-Wells together by metal? It seems ok to me though ideally connecting them by metal would be closer to the model provided by foundry. Anyone? Thanks
  14. C

    Capacitance between nwell to substrate??

    If you are using RF CMOS model then it should be included for you. Just check the report provided by the foundry.
  15. C

    The stability of LNA?

    lna stability equations I added a 20f capacitance between the output node and Vdd in the simulation. The LNA still works fine in simulation but will it in real silicon?
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