Low power crystal oscillator with automatic gain control

Details Low power crystal oscillator with automatic gain control Low power crystal oscillator with automatic gain control

1991-04-22

1992-05-12

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331 75, 331116FE, 331158, 331183, H03B 536, H03L 100

Patent

active

051131560

ABSTRACT:
A crystal oscillator uses automatic gain control to minimize the operating current through its inverting amplifier. The power supply potential to switching transistors of the amplifier is reduced by the automatic gain control to a level substantially equal to the sum of the switching thresholds thereof which minimizes simultaneous conduction through the switching transistors and associated operating current. The low level output signal of the amplifier becomes sinusoidal about a DC bias point operating at the resonant frequency of the crystal which eliminates undesirable harmonicas interfering with the crystal's natural vibration. The sinusoidal output signal may be buffered and level-shifted to a useable state.

REFERENCES:
patent: 3725822 (1973-04-01), Eaton, Jr.
patent: 3935546 (1976-01-01), Morozumi et al.
patent: 4128816 (1978-12-01), Shimotsuma

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