Low noise oscillator

Details Low noise oscillator Low noise oscillator

H - Electricity

03

B

331/66

H03B 5/18 (2006.01) H03B 1/04 (2006.01)

Patent

CA 1261411

-12- LOW NOISE OSCILLATOR ABSTRACT A low noise oscillator. A circuit config- uration 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.

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