I need to design a unity gain amplifier for a sample and hold circuit. I've decided to use the circuit shown in the attachment. Now I know the gain = 0.5(Gm2*R1)[(Gm3*R2)/(1 + Gm3*R2)]. The 2N7000 has a Gm of 0.1, so that gets me the values of R1 and R2. I don't know if these are good values to use. Components Q1, M1, R3, and R4 comprise the bias current source. Obviously, I'm not understanding the theory behind the circuits. I hope someone here can help me understand this better.
Thanks a lot,
Mike
Thanks a lot,
Mike
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