Invention Grant
- Patent Title: Cancellation of spurious tones within a phase-locked loop with a time-to-digital converter
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Application No.: US14448458Application Date: 2014-07-31
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Publication No.: US09762250B2Publication Date: 2017-09-12
- Inventor: Michael H. Perrott
- Applicant: Silicon Laboratories Inc.
- Applicant Address: US TX Austin
- Assignee: Silicon Laboratories Inc.
- Current Assignee: Silicon Laboratories Inc.
- Current Assignee Address: US TX Austin
- Agency: Zagorin Cave LLP
- Main IPC: H03L7/06
- IPC: H03L7/06 ; H03L7/08 ; H03L7/093 ; H03M1/08 ; H03M1/66 ; G04F10/00 ; H03L7/099 ; H03M3/00 ; H03L7/085 ; H02M3/07 ; H03M7/30

Abstract:
A phase-locked loop (PLL) includes a spur cancellation circuit that receives a residue signal indicative of a first frequency and receives a residual phase error signal and generates a spur cancellation signal. A summing circuit combines the spur cancellation signal and a first phase error signal corresponding to a phase difference between a reference signal and a feedback signal in the PLL and generates a second phase error signal with a reduced spurious tone at the first frequency.
Public/Granted literature
- US20150145567A1 CANCELLATION OF SPURIOUS TONES WITHIN A PHASE-LOCKED LOOP WITH A TIME-TO-DIGITAL CONVERTER Public/Granted day:2015-05-28
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