Oscillators – Solid state active element oscillator – Transistors
Patent
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.
Emanuel Peter M.
LaRoche Eugene
Rasmussen Paul J.
RCA Corporation
Wan G.
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