High gain, low drift operational amplifier for sample and hold c

Details High gain, low drift operational amplifier for sample and hold c High gain, low drift operational amplifier for sample and hold c

1985-08-23

1987-01-06

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330255, 330257, 330258, 330260, 307353, H03F 345

Patent

active

046349936

ABSTRACT:
A sample and hold circuit includes a high gain, low drift closed loop operational amplifier that isolates the sampling capacitor and provides low output impedance, and a low, stable, input offset voltage and very high bandwidth. The operational amplifier includes N-channel FET source followers coupled by balanced bias and level shifting circuitry to an NPN differential amplifier stage. Symmetrical, buffered cross-coupling from each of the source follower FETs to the opposite level shifting circuitry increases the amplification thereof and results in low DC offset voltage, high input impedance, and high gain and bandwidth.

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