Crystal controlled square wave oscillator

Details Crystal controlled square wave oscillator Crystal controlled square wave oscillator

1976-10-18

1977-08-23

Kominski, John

Oscillators

Solid state active element oscillator

Transistors

310361, 310366, 310369, 331 59, 331163, H03B 536

Patent

active

040443175

ABSTRACT:
A crystal controlled square wave oscillator requiring a minimum number of components, exhibiting high frequency stability, and operating at substantially a 50% duty cycle. A quartz crystal dual monolithic resonator is provided having a pair of signal electrodes and a reference electrode. The resonator is capable of oscillating in symmetric and anti-symmetric modes, points of minimum attenuation, the symmetric mode exhibiting a 180.degree. phase shift, and the anti-symmetric mode exhibiting a phase shift of 0.degree.. An integrated circuit logic gate is connected between the signal electrodes, the logic gate being of the type having low input and output impedances so as not to degrade the Q of the resonator. The logic gate provides a phase shift of 180.degree. or 0.degree. causing the resonator to oscillate in its symmetric or anti-symmetric modes, respectively, the gate switching between its two logic levels to produce a square wave output at the frequency of the excited mode.

REFERENCES:
patent: 3815129 (1974-06-01), Sweany
patent: 3911378 (1975-10-01), Buchanan
patent: 3916345 (1975-10-01), Eberlein et al.

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