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Recent content by impulse123

  1. I

    Gain Boosting with folded cascode

    Hi All, I have to design a PGA where 1st stage of my circuit is a folded casocde and second stage is a common source. There is a resistive feedback in my circuit . I have to design it to meet the following specs a) 100 Mhz 3db BW b) SNR >= 70 db c) Phase Margin >= 60 degree d) IM3 at 20Mhz >=...
  2. I

    2 stage cascode opamp phase margin

    Hi jgk2004, I am attaching my closed loop and open loop transient response. My closed loop transient response look fine. but open loop has a ring, and my phase margin is also too less. I am not able to understand where are things getting wrong? My design has resistive feedback in fully...
  3. I

    2 stage cascode opamp phase margin

    Hi jgk2004, Thanks for your reply. Yes you are correct. I am looking at closed loop response. I was just wondering if closed loop response gives me correct picture of phase margin or not? Also, my closed loop gain varies from -12db to 6db. So I would have a look at the open loop response now...
  4. I

    2 stage cascode opamp phase margin

    Hi all, I am designing a 2 stage cascode opamp. My specs are 100 MHz 3-db Bandwidth, phase margin of >= 60 degree. Also, I have to meet linearity specs. H I have attached my schematic and gain and phase plots. However, I am not able t0 understand the phase plot. Can anybody let me know if its...
  5. I

    the ideal model of fully differential opamp in ADS

    I am trying to design a Programmable Gain Amplifier, which contains resistive feedback and a fully differential opamp. For the first step, I want to start with ideal switches and an ideal Opamp(voltage controlled current source with RL and CL). But I don't know how to represent a ideal fully...
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