Craig Walter Nelson
Engineers in Boulder, CO
License number
Colorado 58082
Issued Date
Jun 18, 1990
Renew Date
Jun 18, 1990
Type
Engineer Intern
Address
Address
2075 Goss 12, Boulder, CO 80302
Professional information
High Spectral Purity Microwave Oscillator Using Air-Dielectric Cavity
US Patent:
7075378, Jul 11, 2006
Filed:
Jul 7, 2004
Appl. No.:
10/885118
Inventors:
David A. Howe - Louisville CO, US
Amitava Sen Gupta - New Delhi, IN
Craig Nelson - Boulder CO, US
Fred L. Walls - Boulder CO, US
Amitava Sen Gupta - New Delhi, IN
Craig Nelson - Boulder CO, US
Fred L. Walls - Boulder CO, US
Assignee:
The United States of America as represented by the Secretary of Commerce, the National Institute of Standards and Technology - Gaithersburg MD
International Classification:
H03B 5/18
US Classification:
331 96, 331117 D, 331107 DP, 331175, 331107 G, 331 68
Abstract:
A high spectral purity microwave oscillator is provided. The Oscillator uses an air-dielectric cavity and employs the known carrier-suppression technique. In one embodiment, the oscillator employs a high-Q cavity to self-sustain an oscillating signal formed by feeding back into its input a power-amplified output signal of the cavity in which residual phase noise in the amplifier stages is suppressed. A bandpass filter selects the cavity mode. FIG. illustrates this embodiment. Another embodiment suppresses the noise of a voltage-controlled oscillator whose frequency and power-amplified output interrogates the cavity mode. FIG. illustrates this embodiment.