Gain stage circuit with automatic level control

Details Gain stage circuit with automatic level control Gain stage circuit with automatic level control

1993-01-04

1995-07-11

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

330279, 327306, 323316, G05F 110

Patent

active

054323894

ABSTRACT:
A gain stage circuit having automatic level control is provided. In particular, the gain stage circuit provides an output voltage signal that is a predetermined multiple of the input voltage signal when the input voltage is less than a predetermined threshold. Moreover, the gain stage circuit provides an output voltage that is maintained at a constant predetermined level and independent of the input voltage signal for input voltages that are above a predetermined threshold. The gain stage circuit includes a rectification circuit, a variable gain stage circuit, a current switch and an operational amplifier. The current switch circuit of the present invention provides either an output current of the rectification circuit or a constant current to a reference input of the variable gain stage circuit. Moreover, the variable gain circuit includes a gain input that is coupled to receive a constant reference current.

REFERENCES:
patent: 4234853 (1980-11-01), Yamaguchi
patent: 4479066 (1984-10-01), Embree
patent: 4513253 (1985-04-01), Schroder
patent: 4878031 (1989-10-01), Main
patent: 5012139 (1991-04-01), Sasak et al.
patent: 5132632 (1992-07-01), Russell et al.
patent: 5204637 (1993-04-01), Trinh

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