Phase-locked loop for communication between integrated circuit systems, has charge pump receiving control signals generated in response to comparison of reference clock signal and feedback signal

摘要

The loop (21) has a charge pump (22) receiving two control signals generated in response to a comparison of phases of a reference clock signal and a feedback signal. An operational amplifier with an input that receives a signal of the charge pump, and other two inputs receive the two control signals, respectively. A voltage controlled oscillator receives a control voltage signal and generates a feedback clock signal. Independent claims are also included for the following: (A) a memory system comprising a memory controller and memory modules with memory device (B) a method for receiving charge pump control signals.