Invention Grant
- Patent Title: Fractional-N offset phase locked loop
- Patent Title (中): 小数N偏移锁相环
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Application No.: US11047258Application Date: 2005-01-31
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Publication No.: US07098754B2Publication Date: 2006-08-29
- Inventor: Scott Robert Humphreys , Ryan Lee Bunch , Barry Travis Hunt, Jr. , Alexander Wayne Hietala
- Applicant: Scott Robert Humphreys , Ryan Lee Bunch , Barry Travis Hunt, Jr. , Alexander Wayne Hietala
- Applicant Address: US NC Greensboro
- Assignee: RF Micro Devices, Inc.
- Current Assignee: RF Micro Devices, Inc.
- Current Assignee Address: US NC Greensboro
- Agency: Withrow & Terranova, PLLC
- Main IPC: H03C3/00
- IPC: H03C3/00 ; H04L27/20

Abstract:
A fractional-N offset phase locked loop (FN-OPLL) is provided. The FN-OPLL includes a fractional divider, a phase detector, a loop filter, a voltage controlled oscillator (VCO), and feedback circuitry. Combiner circuitry combines an initial fractional divide value and a modulation signal to provide a combined fractional divide value. Based on the combined fractional divide value, the fractional-N divider divides a reference frequency and provides a divided reference frequency to the phase detector. The phase detector compares a phase of the divided reference frequency to a phase of a feedback signal to provide a comparison signal. The comparison signal is filtered by the loop filter to provide a control signal to the VCO, where the control signal controls a frequency of an output signal of the VCO. The output signal is processed by the feedback circuitry to provide the feedback signal to the phase detector.
Public/Granted literature
- US20060170505A1 FRACTIONAL-N OFFSET PHASE LOCKED LOOP Public/Granted day:2006-08-03
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