Invention Grant
US07750701B2 Phase-locked loop circuits and methods implementing multiplexer circuit for fine tuning control of digitally controlled oscillators
失效
锁相环电路和实现多路复用电路的方法，用于数字控制振荡器的微调控制
- Patent Title: Phase-locked loop circuits and methods implementing multiplexer circuit for fine tuning control of digitally controlled oscillators
- Patent Title (中): 锁相环电路和实现多路复用电路的方法，用于数字控制振荡器的微调控制
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Application No.: US12173159Application Date: 2008-07-15
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Publication No.: US07750701B2Publication Date: 2010-07-06
- Inventor: Herschel A. Ainspan , Daniel J. Friedman , Alexander V. Rylyakov , Jose A. Tierno
- Applicant: Herschel A. Ainspan , Daniel J. Friedman , Alexander V. Rylyakov , Jose A. Tierno
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agency: Tutunjian & Bitetto, P.C.
- Agent Anne V. Dougherty, Esq.
- Main IPC: H03L7/06
- IPC: H03L7/06
Abstract:
Circuits and methods are provided in which fine tuning control of a DCO (digitally controlled oscillator) circuit in a digital PLL circuit is realized by dither controlling a multiplexer circuit under digital control to selectively output one of a plurality of analog control voltages with varied voltage levels that are input to a fractional frequency control port of the DCO to drive tuning elements of the DCO at fractional frequency resolution and achieve continuous fine tuning of the DCO under analog control.
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