Invention Grant
- Patent Title: Phase frequency detector linearization using switching supply
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Application No.: US15710593Application Date: 2017-09-20
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Publication No.: US10534025B2Publication Date: 2020-01-14
- Inventor: Jingcheng Zhuang
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Qualcomm Incorporated/Seyfarth Shaw LLP
- Main IPC: G01R23/02
- IPC: G01R23/02 ; G01R25/00 ; H03L7/089

Abstract:
A phase frequency detector (PFD) isolates supply (e.g., voltage supply) to a reference path and a feedback path of a phase locked loop (PLL) such that the power supply to the reference path is independent of the power supply to the feedback path. This isolation improves linearity. In one instance, the PFD includes a supply voltage, one or more switches, a reference capacitor and a feedback capacitor. The reference capacitor is selectively coupled to the supply voltage via the one or more switches and the feedback capacitor is selectively coupled to the supply voltage via the one or more switches.
Public/Granted literature
- US20180356451A1 PHASE FREQUENCY DETECTOR LINEARIZATION USING SWITCHING SUPPLY Public/Granted day:2018-12-13
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