Patent ID: 6882693
Filing Date: 2005-04-19
Classification: H04L

Abstract:
1. A digital signal receiver comprising: an input terminal for receiving a digital modulation input signal; at least two variable gain amplifiers coupled in series to said input terminal for controlling the level of the input signal; an analog-to-digital (A/D) converter for receiving an output of said variable gain amplifier; a level comparator coupled to an output of said A/D converter for comparing a level of the output of said A/D converter and a reference level; a loop filter coupled to said level comparator; and a control voltage generator for generating control voltages for controlling said variable gain amplifiers based on an output of said loop filter, wherein an operation-starting point of any said variable gain amplifier is shifted using the control voltages when a level fluctuation response speed of any of said variable gain amplifiers is lower than a reference level.