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Frequency synthesizer utilizing phase shifted control signals

IPC분류정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판)
  • H03B-005/08
  • H03L-007/06
  • H03L-007/087
  • H03L-007/091
  • H03L-007/16
출원번호 US-0621803 (2000-07-21)
발명자 / 주소
  • Welland David R.
  • Wang Caiyi
출원인 / 주소
  • Silicon Laboratories, Inc.
대리인 / 주소
    O'Keefe, Egan & Peterman, LLP
인용정보 피인용 횟수 : 19  인용 특허 : 77

초록

A method and apparatus for synthesizing high-frequency signals, such as wireless communication signals, includes a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage controlled oscillator (VCO) that has a discretely variable capacitance in conjunction with a continuous

대표청구항

[ We claim:] [1.]1. A wireless communication frequency synthesizer having a phase locked loop, comprising:a controllable oscillator having an output frequency dependent at least in part upon a plurality of different frequency control signals;a first clock node coupled to an output of the controllabl

이 특허에 인용된 특허 (77)

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  28. Rosen Arye (Cherry Hill NJ), GaAs Dual-gate FET frequency discriminator.
  29. Ogura Yoichi (Hino JPX), Gain-variable amplifier circuit.
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  31. Benson James A. (Huntingdon Valley PA), High speed frequency agile FSK modulator.
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  34. Martin Frederick L. (Plantation FL), Low voltage VCO having two oscillator circuits of different frequencies.
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  39. Welland David R. ; Scott Jeffrey W., Method and apparatus for providing analog and digitally controlled capacitances for synthesizing high-frequency signals for wireless communications.
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  47. Rousselin Samuel,FRX, Oscillator having correction element switchable by a fuse.
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  77. Nakano Kazuhiro,JPX, Voltage-controlled variable tuning circuit.

이 특허를 인용한 특허 (19)

  1. van der Valk,Robertus Laurentius; Dijkstra,Gerrit; Ching,Philip, Analog PLL with switched capacitor resampling filter.
  2. Lim,Lysander; Wang,Caiyi; Welland,David R.; Kerth,Donald A.; Behrens,Richard T.; Scott,Jeffrey W.; Vishakhadatta,G. Diwakar; Tuttle,G. Tyson; Srinivasan,Vishnu S., Apparatus and methods for generating radio frequencies in communication circuitry using multiple control signals.
  3. Lim,Lysander; Wang,Caiyi; Welland,David R.; Kerth,Donald A.; Behrens,Richard T.; Scott,Jeffrey W.; Vishakhadatta,G. Diwakar; Tuttle,G. Tyson; Srinivasan,Vishnu S., Apparatus for generating multiple radio frequencies in communication circuitry and associated methods.
  4. Kasahara,Masumi; Osawa,Hirotaka; Henshaw,Robert Astle, Communication semiconductor integrated circuit device and a wireless communication system.
  5. Kasahara,Masumi; Osawa,Hirotaka; Henshaw,Robert Astle, Communication semiconductor integrated circuit device and a wireless communication system.
  6. Kuiri, Tapio, Controlling phase locked loop in a mobile station.
  7. Staszewski, Robert B.; Leipold, Dirk, Digital phase locked loop.
  8. Staszewski, Robert Bogdan; Leipold, Dirk, Digital phase locked loop.
  9. Staszewski, Robert Bogdan; Leipold, Dirk, Digital phase locked loop.
  10. Janesch,Stephen T.; Martyniuk,Paul G., Digitally controlled oscillator.
  11. Sohn, Young-Soo; Park, Kwang-II, Dividing circuit and phase locked loop using the same.
  12. Lim,Lysander; Maligeorgos,James, Frequency modification circuitry for use in radio-frequency communication apparatus and associated methods.
  13. Lim,Lysander, Frequency synthesizer for a wireless communication system.
  14. Hofmann,Karl, Method and circuit for producing a control voltage for a VCO.
  15. Saito, Syuichi, Oscillator circuit of internal power generator circuit and control method thereof.
  16. Maligeorgos,James; Marques,Augusto M.; Lim,Lysander; Tuttle,G. Tyson; Rafi,Aslamali A.; Paulus,Tod; Uehara,Gregory T.; Scott,Jeffrey W.; Behrens,Richard T.; Kerth,Donald A.; Vishakhadatta,G. Diwakar;, Partitioning of radio-frequency apparatus.
  17. Maligeorgos,James; Marques,Augusto M.; Lim,Lysander; Tuttle,G. Tyson; Rafi,Aslamali A.; Paulus,Tod; Uehara,Gregory T.; Scott,Jeffrey W.; Behrens,Richard T.; Kerth,Donald A.; Vishakhadatta,G. Diwakar;, Partitioning of radio-frequency apparatus.
  18. Lim,Lysander; Maligeorgos,James, Systems and methods for providing an adjustable reference signal to RF circuitry.
  19. Al-Shahrani, Saad Mohammad, Wideband programmable phase shifting circuit.
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