Oscillator circuit

Details Oscillator circuit Oscillator circuit

2010-01-27

2011-10-25

Johnson, Ryan (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S160000, C331S109000, C331S183000

Reexamination Certificate

active

08044731

ABSTRACT:
There is provided an oscillator circuit including: a current source; a resonant unit; an oscillation amplification unit connected to the current source and connected in parallel to the resonant unit; a feedback resistor connected in parallel to the oscillation amplification unit; a switch unit having a first end connected to the current source side of the oscillation amplification unit; a replica circuit connected between a second end of the switch unit and a ground side of the oscillation amplification unit and having a configuration identical to a configuration of the oscillation amplification unit; and a level detecting unit that detects an input voltage of the oscillation amplification unit, and, when the detected input voltage is higher than a bias voltage level at a time of oscillation, cause the switch unit to allow a current from the current sources to bypass through the replica circuit.

REFERENCES:
patent: 7471163 (2008-12-01), Chuah et al.
patent: 7683730 (2010-03-01), Cetin et al.
patent: 6120732 (1994-04-01), None

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