Oscillator circuit having switched gain amplifiers and a circuit

Details Oscillator circuit having switched gain amplifiers and a circuit Oscillator circuit having switched gain amplifiers and a circuit

1998-06-17

2000-09-12

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331158, H03B 536

Patent

active

061183482

ABSTRACT:
An oscillator circuit for preventing noise from occurring in an output clock signal. The oscillator circuit contains an amplifying unit and a control signal generator. The amplifying unit contains a first amplifying circuit having a first gain and a second amplifying circuit having a second gain connected in parallel. The amplifying unit inputs an oscillating input signal and amplifies it based on an overall gain of the amplifier unit to produce an oscillating output signal. The control signal generator inputs an input control signal and generates an output control signal, and the operational state of the first amplifying circuit is switched when a value of the output control signal switches. The overall gain is based on the first gain when the first operational state of the first amplifying circuit is an enabled state and is not based on the first gain when the operational state of the first amplifying circuit is a disabled state. Also, the control signal generator delays switching the value of the output control signal in response to a switching of a value of the input control signal so that noise generated when the value of the input control signal switches does not influence the oscillating output signal.

REFERENCES:
patent: 4965535 (1990-10-01), Neuman
patent: 5041802 (1991-08-01), Wei et al.
patent: 5208558 (1993-05-01), Shigehara et al.
patent: 5557243 (1996-09-01), Ho
patent: 5909152 (1999-06-01), Li et al.

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