Low noise oscillator circuit

Details Low noise oscillator circuit Low noise oscillator circuit

1978-07-31

1979-06-12

Kominski, John

Oscillators

Solid state active element oscillator

Transistors

325473, 330277, H03B 512

Patent

active

041581822

ABSTRACT:
A low noise, high frequency oscillator (50) is disclosed which includes a JFET (100) having a tuned circuit (102) connected in a feedback arrangement with it. The JFET is operated in a self-biasing mode and includes a gate biasing circuit (104) comprised of a capacitor (114) and a resistor (116). The capacitor (114) and resistor (116) are selected such that the gate bias circuit (104) represents a low impedance path to low frequency noise components. These low frequency noise components are therefore shunted to ground, and do not modulate the operation of the JFET (100). This significantly reduces noise in the oscillator output signal. A hot carrier diode (118) is connected across the gate-to-source junction of the JFET (100) to reduce loading on the tuned circuit (102) by the JFET (100).

REFERENCES:
patent: 3281699 (1966-10-01), Harwood
patent: 3436681 (1969-04-01), Hart
patent: 3534294 (1970-10-01), Aver
patent: 3775698 (1973-11-01), Nugent et al.

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