| 摘要 |
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. |
