Low noise oscillator

Details Low noise oscillator Low noise oscillator

1984-11-23

1986-04-01

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Transistors

331109, 331183, 331116FE, H03B 500

Patent

active

045801096

ABSTRACT:
A circuit configuration is provided for reducing noise sidebands in the output of an oscillator due to modulation of the oscillation signal by characteristic noise produced by the amplifying element. A gallium arsenide field-effect transistor that produces characteristic noise is operated as a linear amplifier. Positive feedback to the input of the amplifier is provided by a resonator. The amplitude of the oscillation signal is limited by a distinct limiting circuit in the feedback loop, the input to which is isolated from the amplifier by a high pass filter, thereby divorcing the non-linear limiting function of the oscillator from the amplifying function where noise is generated.

REFERENCES:
patent: 3996530 (1976-12-01), Feistel et al.

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