Control device for a phase lock loop vernier frequency synthesizer United States Patent 04234929

04234929 is referenced by 27 patents and cites 4 patents.

Disclosed is a device for controlling the selection of divider factors in a vernier frequency synthesizer employing a pair of phase lock loops coupled through a mixer to supply a synthesized output signal frequency. The control device generates a pair of divider factors for the respective programmable dividers of the two loops which will generate a particular synthesized output frequency and avoids predetermined divider factors such as those which are not processable by programmed dividers of the loops or which would generate frequencies within the loops causing spurious mixing products with other signals. The control device preferably takes the form of a microprocessor.

Title
Control device for a phase lock loop vernier frequency synthesizer
Application Number
6/78210
Publication Number
4234929
Application Date
September 24, 1979
Publication Date
November 18, 1980
Inventor
William J Riley Jr
Rochester
NY, US
Agent
L Lawton Rogers III
Assignee
Harris Corporation
FL, US
IPC
G06F 7/68
View Original Source

Citations: 27 (view full list)

  1. Paul W Dent: Dual-mode satellite/cellular phone with a frequency synthesizer. Ericsson GE Mobile Communications, Burns Doane Swecker & Mathis, July 9, 1996: US05535432 (191 worldwide citation)
  2. Walter L Davis, Barry W Herold, Wendell L Little: Synthesized clock microcomputer with power saving. Motorola, Vincent B Ingrassia, Anthony J Sarli Jr, January 9, 1990: US04893271 (144 worldwide citation)
  3. Paul W Dent: Satellite/cellular phone using different channel spacings on forward and return links. Ericsson, Burns Doane Swecker & Mathis, September 28, 1999: US05960364 (49 worldwide citation)
  4. Paul W Dent: Dual loop frequency synthesizer having fractional dividers. Ericsson, Burns Doane Swecker & Mathis L, March 11, 1997: US05610559 (38 worldwide citation)
  5. John G Freed: Electronically adjustable balanced-to-unbalanced converters (balun). Ericsson, Myers Bigel Sibley & Sajovec, December 28, 1999: US06009318 (23 worldwide citation)
  6. Steve S Yang: Wide band, low noise, fine step tuning, phase locked loop frequency synthesizer. Hughes Aircraft Company, Randall M Heald, Charles D Brown, Wanda K Denson Low, May 31, 1994: US05317284 (18 worldwide citation)
  7. Steve S Yang, Keith P Arnold: Low noise fine frequency step synthesizer. Hughes Aircraft Company, C D Brown, R M Heald, W K Denson Low, September 22, 1992: US05150078 (18 worldwide citation)
  8. Albert T Crowley: Precise digitally programmed frequency source. RCA Corporation, Samuel Cohen, Joseph S Tripoli, Donald W Phillion, September 14, 1982: US04349887 (17 worldwide citation)
  9. Joel Remy: Frequency synthesizer including a fractional multiplier. Adret Electronique, William A Drucker, July 3, 1984: US04458329 (14 worldwide citation)
  10. Benedict A Itri: Frequency synthesizer incorporating vernier phase adjuster. PairGain Technologies, Freilich Hornbaker Rosen, October 26, 1993: US05256980 (14 worldwide citation)

References: 4

  1. Mayer Ferdy: Parametric device for multiplying frequencies. October 30, 1973: US3769597 (8 worldwide citation)
  2. Gerken William G: Digital frequency synthesizer. General Dynamics, Lukacher Martin, May 6, 1975: US3882403 (27 worldwide citation)
  3. Bosselaers Robert Jan: Phase locked loop including an arithmetic unit. RCA Corporation, Norton Edward J, Wright Carl M, Tripoli Joseph S, October 14, 1975: US3913028 (31 worldwide citation)
  4. November, 1967: US3353104