Patent ID: 7782095
Filing Date: 2010-08-24
Classification: G01R,H03F,H03K

Abstract:
1. A signal comparison circuit, comprising: a first amplifier, receiving and amplifying a data signal, wherein the first amplifier is a zero-peaking amplifier; a second amplifier, receiving and amplifying a reference voltage, wherein the data signal passes through a first path in the first amplifier and the reference voltage passes through a second path in the second amplifier, the first path and the second path are equivalent; a peak detector, coupled to the first amplifier and the second amplifier, detecting and maintaining maximum values of respectively the amplified data signal and the amplified reference voltage and outputting the maintained data signal and the maintained reference voltage; and a comparator, coupled to the peak detector for comparing the maintained data signal with the maintained reference voltage, and outputting a comparison result therefrom, wherein a maximum gain of the first amplifier for the data signal is located according to a data transmission rate of the data signal and the first amplifier generates the maximum gain for compensating output voltage droop of the peak detector caused by internal current leakage of the peak detector.