Low phase noise oscillator using negative feedback
AssigneeKeysight Technologies, Inc.
InventorDean Nicholson
Life of this patent
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Abstract
An oscillator includes a resonator and a first loop circuit. The first loop circuit includes an amplifier and a first coupler. That first loop circuit is electrically coupled to the resonator. The oscillator is configured to produce negative feedback for the amplifier in a cavity mode relative to short circuit terminations or open circuit terminations of a cavity modelling the oscillator at frequencies offset from a carrier frequency. The oscillator has a loss of less than 4.00 dB for a bidirectional trip through the cavity at the frequencies offset from the carrier frequency.
Claims20
An oscillator, comprising:
- a resonator;
- and
- a first loop circuit that includes an amplifier and a first coupler, and that is electrically coupled to the resonator, wherein the oscillator is configured to produce negative feedback for the amplifier in a cavity mode relative to short circuit terminations or open circuit terminations of a cavity modelling the oscillator at frequencies offset from a carrier frequency, and wherein the oscillator has a loss of less than 4.00 dB for a bidirectional trip through the cavity at the frequencies offset from the carrier frequency.
An oscillator, comprising:
- a resonator;
- a first loop circuit that includes an amplifier and a first coupler, and that is electrically coupled to the resonator;
- and
- a second loop circuit that produces negative feedback for the amplifier,
- wherein the oscillator is configured to produce negative feedback for the amplifier in a cavity mode relative to short circuit terminations or open circuit terminations of a cavity modelling the oscillator at frequencies offset from a carrier frequency, and wherein the oscillator has a loss of less than 4.00 dB for a bidirectional trip through the cavity at the frequencies offset from the carrier frequency.
Dependencies are inferred from the claim text.