Limiter circuit

Details Limiter circuit Limiter circuit

1975-09-05

1976-08-10

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307264, 328168, 328171, 328175, 330 29, 330145, H03K 508, H03K 114, H03G 330

Patent

active

039744000

ABSTRACT:
Signal voltage to be limited is applied across a voltage divider comprising a resistor and a controllable impedance element that includes a pair of transistors. The emitter-collector circuit of the transistors is connected in parallel but in opposite polarity, and the output signal voltage is obtained across the controllable impedance element. For limiter operation, a feedback circuit produces a control current based on a signal voltage and applies the control current to the bases of the transistors to control the impedance thereof. When limiter operation is not desired, elements in the feedback circuit are grounded to reduce the controlled current to leakage value. Even the leakage current is prevented from reaching the bases of the transistors by means of a circuit rendered non-conductive in series with the control current circuit. In addition, a bypass path, which is only conductive when limiter operation is not desired, diverts the leakage control current to ground and away from the transistors of the controllable impedance circuit.

REFERENCES:
patent: 3560768 (1971-02-01), Rimkus
patent: 3835401 (1974-09-01), Tomita et al.

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