Precision differential amplifier having fast overdrive recovery

Details Precision differential amplifier having fast overdrive recovery Precision differential amplifier having fast overdrive recovery

1986-10-15

1987-12-22

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330252, 330259, H03F 345

Patent

active

047148969

ABSTRACT:
A precision differential amplifier having unity-gain buffer amplifier input stages on each side of the amplifier includes a primary feedback path between the collector and base of the inside buffer amplifier transistor which operates when the differential amplifier is operated within its linear operating range. Under an overdrive signal condition, the primary feedback path is opened and a secondary feedback is activated to control the collector and base of the inside buffer amplifier transistor, thus preventing saturation of the inside buffer amplifier transistor and cutoff of the outside transistor. The primary and secondary feedback paths consist of only semiconductor junctions, minimizing heat and loading effects, reducing power supply voltage requirements, and facilitating rapid overdrive recovery.

REFERENCES:
patent: 4528515 (1985-07-01), Gross
Robert J. DeKok et al., Monolithic Instrumentation Amplifier, Electrical Engineering, vol. 3, No. 3, Jul. 1978, pp. 225-236.

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