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Browse Prior Art Database

Gated Operational Amplifiers

IP.com Disclosure Number: IPCOM000090632D
Original Publication Date: 1969-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Moerschell, GE: AUTHOR

Abstract

In drawing A, operational amplifier 1, a Miller type pulse integrator, is switched from inoperative to operative status by gate signals applied to diode bridge gate 2. The components of the bridge provide precise and rapid on-off switching of amplifier 1 while minimizing the effects of noise signals transferred from the bridge circuits to the amplifier circuits.

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Gated Operational Amplifiers

In drawing A, operational amplifier 1, a Miller type pulse integrator, is switched from inoperative to operative status by gate signals applied to diode bridge gate 2. The components of the bridge provide precise and rapid on-off switching of amplifier 1 while minimizing the effects of noise signals transferred from the bridge circuits to the amplifier circuits.

The diodes in the four legs of the bridge are normally forward biased when there is no gating pulse signal 3 in gate pulse transformer network 4. This effectively short-circuits feedback elements 5 leaving amplifier 1 in its inoperative state.

When the transformer is pulsed, the bridge diodes are reverse biased and amplifier 1 assumes operative status for the entire gating pulse interval t0-t1. In this interval, amplifier 1 operates upon signal 6 to derive output signal 7. This at a predetermined sampling instant of time ts, represents a particular function of the input. In the example, this is the integral function taken over the interval t0-ts.

When the sampled output signal tends to have a small range of variation and resolution is critical, it is important to minimize effects of noise signal transferal from the bridge circuits to the amplifier circuits. This is accomplished by providing a diode bridge with unsymmetric reverse recovery properties. The input leg diodes 8, connected to the amplifier input, and the output leg diodes 9, connected to the amplifier output, are se...