James D. Strom,Grant P. Kesselring,Ann Chen Wu,Scott R. Trcka
申请号：
US16442827
公开号：
US10644709B2
申请日:
2019.06.17
申请国别(地区):
US
年份:
2020
代理人:
摘要：
A differential charge pump circuit for use in a phase-locked loop (PLL) circuit is disclosed. The circuit includes a reference current, two sense amplifiers, a common mode control amplifier, and an h-bridge circuit. The h-bridge circuit is coupled to the reference current and the common mode control amplifier. The reference current drives a first portion of the h-bridge circuit and the common mode control amplifier controls a second portion of the h-bridge circuit. The h-bridge circuit also includes first and second nodes. The circuit controls a voltage at the first node so that it is substantially equal to a voltage at the second node for a plurality of voltages at the second node.
