Voltage-controlled oscillator and electronic device using same

Details Voltage-controlled oscillator and electronic device using same Voltage-controlled oscillator and electronic device using same

2005-08-23

2005-08-23

Mis, David (Department: 2817)

Oscillators

Solid state active element oscillator

Significant distributed parameter resonator

C331S1170FE, C331S179000

Reexamination Certificate

active

06933794

ABSTRACT:
A voltage-controlled oscillator includes a voltage-controlled phase-shift circuit for outputting a signal in which the phase of an input signal is shifted by a predetermined amount in accordance with an external control voltage; a plurality of SAW resonators, each of which resonates at a predetermined resonance frequency; switching means for selecting one of the plurality of SAW resonators in accordance with the external control signal; frequency selection means for selecting a predetermined resonance frequency from the selected SAW resonator; an oscillation differential amplifier for amplifying the resonance signal of the predetermined resonance frequency; and a feedback-buffer differential amplifier for inputting the output signal from the oscillation differential amplifier, wherein the voltage-controlled phase-shift circuit, the selected SAW resonator, the frequency selection means, the oscillation differential amplifier, and the feedback-buffer differential amplifier form a positive-feedback oscillation loop.

REFERENCES:
patent: 5475391 (1995-12-01), Spencer
patent: 07-297640 (1995-11-01), None
patent: 08-213838 (1996-08-01), None
patent: 2002-290153 (2002-10-01), None
patent: 2002-335127 (2002-11-01), None
patent: 2002-359521 (2002-12-01), None

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