Integrated crystal VCO

Details Integrated crystal VCO Integrated crystal VCO

1983-10-26

1985-05-14

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Transistors

331158, 331177R, H03B 500

Patent

active

045175330

ABSTRACT:
An integrated crystal voltage controlled oscillator (VCO) with only two terminals for the crystal network and no additional terminals for decoupling, bypass capacitors, etc., as well as no internal capacitors is disclosed. A negative feedback loop having both AC and DC gain for increased amplification stability as well as a separate positive feedback path having little or no DC gain but sufficient AC gain at the desired oscillating frequency to compensate for the negative feedback are provided in the crystal VCO which is capable of low voltage, e.g., 5 VDC, and high frequency, i.e., greater than 10 MHz, operation and thus is particularly adapted for digital applications utilizing emitter coupled logic (ECL).

REFERENCES:
patent: 3839685 (1974-10-01), Borsa et al.
patent: 4484157 (1984-11-01), Helle et al.

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