Invention Grant
- Patent Title: Phase-locked-loop circuit employing a hybrid loop filter with sample and hold capacitors for reduced signal jitter, and related methods
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Application No.: US17646700Application Date: 2021-12-31
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Publication No.: US11722140B2Publication Date: 2023-08-08
- Inventor: Ping Lu , Charles Boecker , Bupesh Pandita
- Applicant: Microsoft Technology Licensing, LLC
- Applicant Address: US WA Redmond
- Assignee: Microsoft Technology Licensing, LLC
- Current Assignee: Microsoft Technology Licensing, LLC
- Current Assignee Address: US WA Redmond
- Agency: Withrow & Terranova, PLLC
- Main IPC: H03L7/093
- IPC: H03L7/093 ; H03L7/091 ; H03L7/099 ; H03L7/089

Abstract:
A phase-locked loop (PLL) circuit generates an analog signal in phase-lock with a reference signal at a reference frequency. The PLL circuit includes a charge pump circuit, a loop filter circuit, a feedback divider, and a voltage controlled oscillator (VCO). The charge pump circuit charges a sample capacitor of the loop filter circuit to a sample voltage based on a phase difference between the generated analog signal and the reference signal. The loop filter circuit stores the sample voltage as a proportional control voltage in a hold capacitor to reduce or avoid ripple in the control voltage that causes jitter in the analog signal. The loop filter circuit also provides the sample voltage to an integral component circuit comprising a comparator and digital accumulator producing an integral control. The VCO generates the analog signal at a frequency based on the proportional control voltage and the integral control voltage.
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