Multiband local oscillator

Details Multiband local oscillator Multiband local oscillator

1985-02-28

1986-06-03

LaRoche, Eugene

Oscillators

Solid state active element oscillator

Transistors

3581951, H03B 500, H04N 550

Patent

active

045932573

ABSTRACT:
A multiband local oscillator of a television tuner comprises a common collector transistor amplifier, a capacitive feedback circuit for conditioning the amplifier to oscillate in the wide range of frequencies for VHF broadcast and cable channels and a multiband tuning circuit coupled to the base electrode of the transistor. Bandswitching signals are applied to the multiband tuning circuit to produce tuned circuit configurations for the various frequency bands. When one band is selected, the corresponding bandswitching signal is coupled to the capacitive feedback network to modify it so as to inhibit out-of-band oscillations due to parasitic elements of the tuning circuit.

REFERENCES:
patent: 3324412 (1967-06-01), Boomgaard
patent: 3889210 (1975-06-01), Matsuura et al.
patent: 4387400 (1983-06-01), Borg
The schematic on pp. 31 and 32 of "RCA Color Television Basic Service Data-CTC 121 Series", File 1982.

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