Fast Operating Switchable Operational Amplifier Driven Circuits.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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Faster switching speeds for switchable noise filters and faster sampling speeds for sample and hold circuits are realized by means of an operational amplifier driven circuit in which excess feedback loop gain of the operational amplifier is used to reduce the effective value of resistance in the devices capacitor charging circuit. Two operational feedback loops are used, one or the other of which is switched into the circuit to effect either an open loop or a closed loop condition. The time required to charge the devices capacitor is a function of the ratio of the operational amplifiers closed loop gain divided by its open loop gain. Author
- Electrical and Electronic Equipment