Sony Corporation

Yoshito Kogure

Kenji Komori

Atsushi Hirabayashi

Kosuke Fujita

A high-performance voltage controlled oscillator without use of variable capacitance (varicap) diodes which is easy in fabrication in an semiconductor IC form. The voltage controlled oscillator includes:a differential amplifier having a differential pair of transistors (Q.sub.1, Q.sub.2); an LC resonance circuit having a coil (L.sub.0) and a capacitor (C.sub.0); a phase shift circuit for receiving a differential output of the differential amplifier via a buffer of transistors (Q.sub.3, Q.sub.4) and for providing its output for the differential amplifier in a positive feedback mode; and a current control circuit for variably controlling an operating current (Ie) of the phase shift circuit according to a controlled voltage applied from a circuit other than those in the voltage controlled oscillator.

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Tokyo, Japan

Yoshito Kogure