Invention Grant
- Patent Title: High gain detector techniques for high bandwidth low noise phase-locked loops
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Application No.: US17461996Application Date: 2021-08-31
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Publication No.: US11784649B2Publication Date: 2023-10-10
- Inventor: Michael Henderson Perrott , Robert Karl Butler
- Applicant: Texas Instruments Incorporated
- Applicant Address: US TX Dallas
- Assignee: TEXAS INSTRUMENTS INCORPORATED
- Current Assignee: TEXAS INSTRUMENTS INCORPORATED
- Current Assignee Address: US TX Dallas
- Agent Frank D. Cimino
- Main IPC: H03L7/06
- IPC: H03L7/06 ; H03L7/08 ; H03L7/107 ; H03L7/081 ; H03L7/187 ; H03L7/04 ; G11C11/4093 ; G11C11/4099 ; H03M1/06 ; H03M1/08 ; H03M1/18

Abstract:
In described examples, a phase locked loop (PLL) has a first phase detector cell (PD) that has a gain polarity. The first PD cell has a phase error output and inputs coupled to a reference frequency signal and a feedback signal. A second PD cell has an opposite gain polarity. The second PD cell has a phase error output and inputs coupled to the reference frequency signal and the feedback signal. A loop filter has a feedforward path and a (lossy) integrating path coupled to an output of the filter. The feedforward path has a third PD cell that has phase error output AC-coupled to the filter output. The integrating path includes an opamp that has an inverting input coupled to the first PD cell phase error output and a non-inverting input coupled to the second PD cell phase error output.
Public/Granted literature
- US20220224343A1 High Gain Detector Techniques for High Bandwidth Low Noise Phase-Locked Loops Public/Granted day:2022-07-14
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