Invention Application
WO2017030849A3 FULLY DIFFERENTIAL CHARGE PUMP WITH SWITCHED-CAPACITOR COMMON-MODE FEEDBACK 审中-公开
充分差动电荷泵与开关电容器共模反馈

FULLY DIFFERENTIAL CHARGE PUMP WITH SWITCHED-CAPACITOR COMMON-MODE FEEDBACK
Abstract:
Certain aspects of the present disclosure provide methods and apparatus for implementing a fully differential charge pump circuit that eliminates a source of noise and power consumption by using a low-noise switched-capacitor common-mode feedback (CMFB) circuit, rather than a continuous-time amplifier-based CMFB circuit. The fully differential charge pump circuit presented in this disclosure includes the switched-capacitor CMFB (SC-CMFB) unit connected to differential output nodes of the charge pump and provides a feedback signal to the charge pump to control a common-mode voltage of the differential signals based on a reference common-mode voltage. In certain aspects, a replica phase-frequency detector (PFD), a frequency divider, and a non-overlapping clock generator provides control signals for the SCCMFB circuit.
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