Variable high frequency crystal oscillator

Details Variable high frequency crystal oscillator Variable high frequency crystal oscillator

1975-06-25

1977-01-04

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331177V, 332 26, 332 30V, H03B 536, H03C 322

Patent

active

040017249

ABSTRACT:
A Colpitts type oscillator having a tank circuit including a crystal, a voltage variable capacitor and split capacitors with a first inductance including a coil connected in series with the crystal and a second inductance including a coil connected in parallel with the series connected coil and crystal and a second coil connected in series with one of the capacitors and the series combination connected in parallel with the first coil of the second inductance, said first and second inductances operating to neutralize the C.sub.o of the crystal, providing an impedance transformation between the crystal and the tank circuit, and improving the stability of the oscillator over a substantially increased warp range.

REFERENCES:
patent: 3569865 (1971-03-01), Healy
patent: 3845410 (1974-10-01), Steel

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