Voltage controlled oscillator with phase control circuits

Details Voltage controlled oscillator with phase control circuits Voltage controlled oscillator with phase control circuits

1977-03-02

1978-12-05

Grimm, Siegfried H.

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

329122, 331 8, 331 34, 331116R, 358 28, H03B 304, H04N 946

Patent

active

041288173

ABSTRACT:
A tank circuit including a quartz vibrator and a phase shifter connected to the tank circuit for forming a vector signal e.sub.1 from the tank circuit and a vector signal e.sub.2 delayed a predetermined angle from the signal e.sub.1. A differential circuit is used to subtract e.sub.1 from e.sub.2 thus forming a difference signal e.sub.3. The delayed signal e.sub.2 is inverted by a phase inverting circuit to obtain two signals e.sub.2 and -e.sub.2 which are applied to an addition circuit where their relative amplitude ratio is controlled. The addition cicuit adds signal e.sub.3 to the signals e.sub.2 and e.sub.3 whose relative amplitude ratio has been controlled for producing a sum signal which is fed back to the tank circuit.

REFERENCES:
patent: 3691475 (1972-09-01), Mouri et al.
patent: 3743764 (1973-07-01), Wittmann
patent: 3780219 (1973-12-01), O'Toole
patent: 3806634 (1974-04-01), Abbott et al.
patent: 3973221 (1976-08-01), Jett, Jr.
patent: 4020500 (1977-04-01), Harwood

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