Oscillators – Solid state active element oscillator – Transistors
Patent
1986-11-26
1988-05-10
LaRoche, Eugene R.
Oscillators
Solid state active element oscillator
Transistors
331177V, 455195, 455318, H03B 500
Patent
active
047438665
ABSTRACT:
A local oscillator is arranged in a Colpitts type configuration in which an amplifying device such as a bipolar transistor or field effect transistor having a control electrode (base or gate electrode) is coupled to a first electrode (emitter or source electrode) defining the end of a conduction channel through an oscillation conditioning network conditioning the device to oscillate in a given range and also to a frequency determining network including a first varactor diode responsive to the tuning voltage and an inductance element coupled in series between the control electrode and signal ground, and in which the output is taken at a second electrode (collector or drain) defining the other end of the conduction channel. A range extending circuit including a second varactor diode responsive to the tuning voltage is coupled between the control electrode and signal ground for ensuring that the oscillator operates reliably at both ends of the tuning range.
REFERENCES:
patent: 4288875 (1981-09-01), Carter
patent: 4316108 (1982-02-01), Rogers, Jr.
patent: 4494081 (1985-01-01), Lea et al.
patent: 4564822 (1986-01-01), Saitoh et al.
patent: 4593257 (1986-06-01), Wignot
patent: 4596955 (1986-06-01), Horvat et al.
Partial Schematic of the MTT001A (Tuner-RF Section) of RCA CTC 130 Television Chassis on pp. 2-11 and the Parts List on pp. 1-11 of the "1985 CTC 130 RCA Television Basic Service Data".
Partial Schematic of a Japanese Tuner.
The Schematic on p. 25 of Sams Photofact for the Sharp Model 13J41 Television receiver, Set 2395, Folder 2, Dated 3-86.
A Schematic for the UHF/VHF Tuner for Panasonic Models CTF-2077R and CTG-2077R Television Receivers from Sams Photofact #2426.
Emanuel Peter M.
LaRoche Eugene R.
Pascal Robert J.
Rasmussen Paul J.
RCA Corporation
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