Invention Grant
- Patent Title: Phase locked loop design with reduced VCO gain
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Application No.: US15966134Application Date: 2018-04-30
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Publication No.: US10911053B2Publication Date: 2021-02-02
- Inventor: Nitin Gupta , Kapil Kumar Tyagi
- Applicant: STMicroelectronics International N.V.
- Applicant Address: NL Schiphol
- Assignee: STMicroelectronics International N.V.
- Current Assignee: STMicroelectronics International N.V.
- Current Assignee Address: NL Schiphol
- Agency: Crowe & Dunlevy
- Main IPC: H03L7/085
- IPC: H03L7/085 ; H03L7/099

Abstract:
A PLL includes a phase frequency detector (PFD) receiving an input signal and feedback signal, and producing a control signal. A charge pump receives the control signal and produces an initial VCO control. A loop filter generates a fine VCO control and intermediate output based upon the initial VCO control. A coarse control circuit includes an integrator having a first input receiving the intermediate output, a second input, and generating a coarse VCO control, a first switch coupling a reference voltage to the second input, a buffer buffering output of the integrator, and a second switch coupling output of the integrator to the second input of the integrator. A VCO receives the fine VCO control and the coarse VCO control, and generates an output signal having a frequency based thereupon. A feedback path receives the output signal and produces the feedback signal.
Public/Granted literature
- US20190334530A1 PHASE LOCKED LOOP DESIGN WITH REDUCED VCO GAIN Public/Granted day:2019-10-31
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