Title:
LOW NOISE MICROWAVE SYNTHESIZER EMPLOYING HIGH FREQUENCY COMBS FOR TUNING DRIFT CANCEL LOOP
Document Type and Number:
WIPO Patent Application WO2002101403
Kind Code:
A3
Abstract:
A microwave synthesizer includes a drift-cancel loop having a narrow-band input (252), a low-frequency comb input (256), a wide-band input (254), and an output for providing an adjustable-frequency output signal. A narrow-band synthesizer is coupled to the narrow-band input, and a comb generator is coupled to the low-frequency comb input. Instead of using a wide-band synthesizer to drive the wide-band input, as conventional topologies have done, the instant invention employs a highly stable, low noise high frequency oscillator (222). The output of the oscillator is mixed with the output of the comb generator to produce low-noise, high frequency combs. The low-noise, high frequency combs are then used to drive the wide-band input of the drift-cancel loop. Significant reductions in phase noise can be achieved as compared with conventional designs.
Inventors:
CUDDY BERNARD M
Application Number:
PCT/US2002/015710
Publication Date:
February 27, 2003
Filing Date:
May 15, 2002
Export Citation:
Assignee:
TERADYNE INC (US)
International Classes:
G01R31/28; H03L7/18; H03B21/00; (IPC1-7): G01R31/28; G01R29/26
Foreign References:
| US3049674A | 1962-08-14 | |||
| US6057690A | 2000-05-02 |
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