Time to voltage conversion to get fixed gain in differential input structure.

Discussion in 'General Electronics Chat' started by sumeet123, Sep 10, 2014.

  1. sumeet123

    Thread Starter New Member

    Sep 10, 2014
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    I have a differential input Vin1 and Vin2 to PMOS P1 and P2. Vin2 is constact (1.5V) and have a capacitor (0.5pF) below transistor P2. ISS is 1uA and gm of Vin1 is about 5u. P2 is connected via switch and I want to control the gain by turning on the P2 for certain time. But I give time 1us gain is not as expected. I am taking the output in between P2 and capacitor. I expect gain to be (gm x time /C). What is wrong in my calculation.
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,016
    3,235
    You need to post a schematic of your circuit so we can understand what you are referring to.
     
    sumeet123 likes this.
  3. sumeet123

    Thread Starter New Member

    Sep 10, 2014
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    thank you for the reply.

    This the rough schematic I want to implement. where first discharge the cap Cs by turning on the phi1 and then charge for certain time by turning P2.
     
  4. sumeet123

    Thread Starter New Member

    Sep 10, 2014
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    Sorry for bad English in my previous post. I want to know the Vo equation in terms of gm, time (P2 ON), capacitance and Vin, VR
     
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