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Recent content by cooleyn

  1. C

    HFSS package simulation

    Maybe PCB ground or exposed pad under mound.
  2. C

    What is the exact expression for adjacent channel rejection ratio ?

    question about ACR In Receiver, it also means adjacent channel selectivity(ACS), which depends on LO's phase noise, linearity and channel filter..
  3. C

    where can find the all equation definition in ads or RFDE?

    Search the equation or function in ADS, and the help documents are enough.
  4. C

    Large signal measurement in ADS

    HB solver is suitable for large signal oscillator simulation in ADS.
  5. C

    Need SMA connector without elbow design in HFSS

    sma connector Any HFSS model please upload.. I also need it..
  6. C

    Designing a broadband matching network

    broadband matching ads First of all, bode-fano rule should be investigated that to what extent we can do for this broadband matching. The reflection coefficient should meet : |Tao|min=exp(-pi*Q0/Qs). In your case, assume 10% bandwidth achieve for matching, Q0=10, For RLC series source...
  7. C

    Ansoft Designer Vs Ansoft HFSS

    hfss 10 compatible nexxim version Designer: circuit simulator and planar EM simulator(2.5D MoM method). HFSS : 3D structure EM simualtor(FEM method)
  8. C

    Designing a broadband matching network

    smith.exe smith chart You could refer to some filter design/synthesis book. You have to put L and C as part of bandpass filter.Since R is so small(Q valueis high), I think it's difficult.If you accept loss matching, it becomes more easy. What're the specific values for L and C?
  9. C

    Designing a broadband matching network

    broadband matching How wide bandwidth do u want to achieve for the matching? and the S11? For achieving above 10% band width bandpass filter maybe need for the matching.. Since R is so small, it's hard to do matching..
  10. C

    GPS Frontend with 2-bit ADC output IF

    ieee gps adc 1-bit 2-bit Please refer some paper about GPS baseband algorithm. 1bit A/D leads to about 2dB SNR demodulation loss, while 2bit A/D only leads to 0.6dB. For interference rejection performance, 2 bit A/D is better than sinlge bit(>5dB). So many ICs use 2bit A/D for GPS BB with...
  11. C

    I/Q mismatch in receiver.

    In low-IF, I/Q mismatch causes the degradation of the image rejection. Since the adjacent channel is the image frequency in low-if receiver if 1/2 bandwidth is choosen as low-if frequency, if I/Q mismatch(SSB, gain/phase imbalance in quadrature mixer) is -30dB and the adjacent channel is +30dB...
  12. C

    why i/q downconverter or upconverter mixer is used

    I/Q is used to perform complex modulation/demodulation. In low -IF， I/Q down mixer is used to do spectrum shifter and reject image at negnative frequency with polyphase filter.
  13. C

    A question about phase noise

    But how to define the phase noise spec of a buffer?
  14. C

    Low pass filter design

    I think you could try broadband matching network for antenna to a around-fix load impedance in your band(30-250MHz), says 55Ohm. Then the LPF can be fixed.
  15. C

    Direct Conversion of 802.11a receiver

    Most of the wlan TRx products use direct-conversion architecture today, such as Maxim's, Airoha's, broadcom's, TI's, Realtek's.., ZIF architecture is very suitable for broadband application shuch as WLAN.
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