Voltage-controlled crystal oscillator with variable phase feedba

Details Voltage-controlled crystal oscillator with variable phase feedba Voltage-controlled crystal oscillator with variable phase feedba

1988-09-28

1989-12-19

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331158, H03B 536

Patent

active

048885673

ABSTRACT:
A voltage-controlled oscillator in which a phase shifter is connected to a ceramic piezoelectric resonator. The phase shifter has a first circuit branch containing an amplifier. A second circuit branch is connected in parallel with the first circuit branch and includes a low-pass filter connected in series with a controllable amplifier and switch. The output of the controllable amplifier is applied to a first input of the switch, and a source of reference potential is connected to a second input of that switch. The switch has an output connected to a summing element at a first input of the summing element. A second input of that summing element is connected to the amplifier in the first circuit branch. The output of the summing element is fed back to the ceramic piezoelectric resonator.

REFERENCES:
patent: 3691475 (1972-09-01), Mouri et al.
patent: 4733200 (1988-03-01), Ecklund et al.

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