High performance voltage controlled oscillator that is cost effi

Details High performance voltage controlled oscillator that is cost effi High performance voltage controlled oscillator that is cost effi

1996-05-08

1999-07-27

Kinkead, Arnold

Oscillators

Phase shift type

331117R, 331 23, 329325, 329337, 348726, 455260, 455263, 455264, H03B 508, H03B 500

Patent

active

059297166

ABSTRACT:
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.

REFERENCES:
patent: 5187450 (1993-02-01), Wagner et al.
patent: 5311149 (1994-05-01), Wagner et al.
patent: 5434544 (1995-07-01), Van Veenendaal

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