Low level LC oscillator

Details Low level LC oscillator Low level LC oscillator

1979-06-19

1981-01-06

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331186, H03B 512

Patent

active

042439540

ABSTRACT:
A local oscillator suitable for integrated circuit construction in a radio receiver maintains low level voltage oscillations across a tank circuit which may include a varactor diode. An emitter-coupled pair of transistors with a small switch-over voltage has the collector of the second transistor connected to the base of the first. Third and fourth matching transistors have emitters connected to the bases of the second and first transistors, respectively, and grounded collectors. The base of the third transistor is connected through a diode to ground; while the base of the fourth transistor is connected through a matching diode and the tank circuit to ground. A source of electric power having a voltage greater than two diode drops above ground is effective to supply current through resistors to the bases of the first and second transistors. The small switch-over voltage of the emitter coupled pair and the current reduction from emitter to base of the fourth transistor provide for small voltage swings across the tank circuit to minimize mistracking with the RF tuned circuits.

REFERENCES:
patent: 3579115 (1971-05-01), Goncharoff et al.
patent: 3649929 (1972-03-01), Thompson
patent: 4058771 (1977-11-01), Ohsawa et al.

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