Resistor and switch-minimized variable analog gain circuit

Details Resistor and switch-minimized variable analog gain circuit Resistor and switch-minimized variable analog gain circuit

2006-06-06

2006-06-06

Pascal, Robert (Department: 2817)

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

C330S282000

Reexamination Certificate

active

07057454

ABSTRACT:
A DSM variable high-gain circuit includes a differential amplifier and a negative feedback loop comprising low resistance poly resistors and switches configured in a T-structure having a junction point as part of the negative feedback loop. A third resistor branch of the T-structure includes a switch that connects the junction point through the third resistor branch to ground when in a closed state and that turns the third resistor branch into an open circuit when in an open state The switch of the third resistor branch, when in the closed state, produces a gain at the output of the variable high-gain circuit.

REFERENCES:
patent: 4354159 (1982-10-01), Schorr et al.
patent: 5973566 (1999-10-01), Leiby
patent: 6703682 (2004-03-01), Aswell

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