Frequency and/or phase characteristic control circuit having con

Details Frequency and/or phase characteristic control circuit having con Frequency and/or phase characteristic control circuit having con

1991-02-06

1992-05-19

Pascal, Robert J.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307511, 358337, 358227, H03G 100

Patent

active

051151545

ABSTRACT:
A frequency and/or phase characteristic control circuit comprising a current multiplier and an operational amplifier, the current multiplier containing a pair of diode junctions and a transistor arrangement for differential amplification, the operation amplifier having a capacitor connected to the out-of-phase input terminal thereof. The multiplying ratio of the current multiplier is varied so as to control the frequency and/or phase characteristic. This makes the circuit conducive to being implemented in an IC (integrated circuit). This circuit is particularly suitable for use as a circuit that switches the servo circuits of a laser disc player and a compact disc player.

REFERENCES:
patent: 4010424 (1977-03-01), Faulkner
patent: 4890065 (1989-12-01), Laletin

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