Circuit for bandswitching a voltage controlled oscillator

Details Circuit for bandswitching a voltage controlled oscillator Circuit for bandswitching a voltage controlled oscillator

1985-04-19

1986-07-22

LaRoche, Eugene R.

Oscillators

With frequency adjusting means

Step-frequency change

331167, 331177V, 334 55, 455176, 455180, H03B 000

Patent

active

046022228

ABSTRACT:
A circuit is provided which is capable of band switching a voltage controlled oscillator (VCO) while maintaining the relative sensitivity of the voltage controlled device and, hence, the control line voltage itself. The circuit includes an array of capacitors, including a pair of capacitors and a voltage variable capacitor (varactor), a switch, and a tuning coil. When the switch is in the open position, the pair of capacitors are connected in parallel with the varactor. When the switch is closed, the pair of capacitors are connected to ground, arraying themselves on opposite sides of the varactor. In this closed position, the overall capacitance of the tuned circuit increased, thus lowering the tuned frequency of the circuit. Since the switched capacitance (i.e., the capacitance which changes the tuned frequency of the circuit) is arrayed on both sides of the varactor, the varactor maintains its relative sensitivity.

REFERENCES:
patent: 3117293 (1964-01-01), Mortley
patent: 3573683 (1971-04-01), Marshall et al.
patent: 3813615 (1974-05-01), Okazaki
patent: 3825858 (1974-07-01), Amemiya et al.
patent: 3866138 (1975-02-01), Putzer
patent: 3980957 (1976-09-01), Putzer
patent: 4247953 (1981-01-01), Shinagawa et al.
patent: 4339827 (1982-07-01), Torres et al.
patent: 4363135 (1982-12-01), Moon

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