Circuit oscillator

Details Circuit oscillator Circuit oscillator

1987-04-09

1989-04-11

LaRoche, Eugene R.

Oscillators

Electromechanical resonator

Crystal

331175, 331177V, H03B 532, H03L 100

Patent

active

048210013

ABSTRACT:
A variable capacitive semiconductor element is connected to a piezo-electric resonator for controlling the oscillating frequency thereof according to the variable capacitance of the capacitive element. The variable capacitive semiconductor element comprises a floating electrode disposed on and electrically isolated from a semiconductor substrate for storing electric charge to form a capacitance region in the semiconductor substrate, a control electrode for injecting electric charge into the floating electrode to determine the amount of capacitance, and a terminal electrode for connecting the variable capacitive element to the piezo-electric resistor. A bias circuit is connected to apply a given voltage to the terminal electrode to adjust the amount of capacitance according to the given voltage.

REFERENCES:
patent: 4097829 (1978-06-01), Cohen

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