Oscillator having controllable frequency compensation for suppre

Details Oscillator having controllable frequency compensation for suppre Oscillator having controllable frequency compensation for suppre

1992-10-16

1994-07-19

Grimm, Siegfried H.

Oscillators

Electromechanical resonator

Crystal

331160, 331175, 331183, H03B 532, H03L 300

Patent

active

053312961

ABSTRACT:
A low-power crystal oscillator circuit is disclosed that includes an amplifier section having a switchable compensation network. In one embodiment, the oscillator circuit incorporates inverter amplifiers to generate a square-wave output signal that can be used, for example, as a clock signal to drive microprocessors and other digital circuitry. The invention takes advantage of the observation that, if the uncompensated bandwidth is not too excessive, compensation is only needed at start-up to ensure oscillation at the desired crystal frequency. Once the desired oscillation is attained, most of the oscillation cycle occurs during the non-linear regions of the amplifier. These non-linear regions are characterized by low gain, thus suppressing any spurious oscillation. The compensation network is removed after start-up to reduce power consumption.

REFERENCES:
patent: 4321562 (1982-03-01), Igarashi
patent: 5050085 (1991-09-01), Wright
patent: 5101178 (1992-03-01), Komoda

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