Frequency and/or phase characteristic control circuit having...

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

H - Electricity

03

L

328/28

H03L 7/00 (2006.01) G11B 7/09 (2006.01) H03H 11/48 (2006.01)

Patent

CA 2035370

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 conductive to being implement 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.

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