Limiter circuit with means to eliminate offset and an optional s

Details Limiter circuit with means to eliminate offset and an optional s Limiter circuit with means to eliminate offset and an optional s

1991-10-10

1992-11-24

Howell, Janice A.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307261, 307359, 307555, 307546, H03K 500, H03K 508, H03K 5153

Patent

active

051666324

ABSTRACT:
A limiter circuit utilizes an RC circuit to provide negative feedback of the average value of the output signal of an amplifier, which may be an op-amp or a comparator, to the inverting input of the amplifier. The midpoint of the amplifier supply voltage is applied to the non-inverting input so that the amplifier operates in the linear range. This, combined with the elimination of the effects of offset produced by the negative feedback, results in a limiter circuit with increased sensitivity to small input signals and therefore extended dynamic range. Where a following circuit would be adversely affected by noise, hysteresis provided by positive feedback applied to the non-inverting input of the amplifier causes the limiter circuit to oscillate, at a frequency determined by the magnitude of the positive feedback and the time constant of the RC circuit providing the negative feedback, for input signals having an amplitude below a threshold set by the magnitude of the positive feedback.

REFERENCES:
patent: 3916342 (1975-10-01), Higuchi et al.
patent: 3917993 (1975-11-01), Picmaus et al.
patent: 4233563 (1980-11-01), Schanbacher
patent: 4564821 (1986-01-01), Reichart
patent: 4634983 (1987-01-01), Schemmel et al.

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