Oscillators – Solid state active element oscillator – Transistors
Patent
1986-11-17
1988-03-29
LaRoche, Eugene R.
Oscillators
Solid state active element oscillator
Transistors
331162, H03B 532
Patent
active
047346574
ABSTRACT:
A channel switching oscillator circuit (230) in which the oscillator frequency is selected from one of a predetermined number of frequencies by switching into the oscillator circuit (230) one of a plurality of tank circuits (L4, L5, L6). The tank circuit (L4, L5, L6) is resonant with one of a plurality of crystals (Y2, Y3, Y4) in the oscillator (230) to generate a carrier signal at the predetermined frequency. The crystals (Y2, Y3, Y4) remain in the oscillator circuit (230) with no switching thereof as the frequencies at which the crystals (Y2, Y3, Y4) oscillate are sufficiently far apart, coupled with the high Q of the tank circuit (L4, L5, L6), that only one of the crystals (Y2, Y3, Y4) is resonant with each tank circuit (L4, L5, L6).
REFERENCES:
patent: 3614667 (1971-10-01), Fletcher
AMP Incorporated
LaRoche Eugene R.
Pascal Robert J.
Smith David L.
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