Patent ID: 7145490
Filing Date: 2006-12-05
Classification: H03M

Abstract:
1. An automatic gain control system comprising: at least one variable gain stage, the or each variable gain stage having an output, a signal input and a control input, said at least one variable gain stages being connectable in series; at least one sensor, the or each sensor having an input and an output, the input of the or each sensor being connectable to a respective output of said at least one variable gain stage; an analogue-to-digital converter having an input connectable to the output of one of said at least one variable gain stages, and an output; a control unit having an output and an input, the input of the control unit being connectable to the outputs of the sensors and to the output of the analogue-to-digital converter; and a digital-to-analogue converter having an input connectable to the output of the control unit, the digital-to-analogue converter further having at least one output, the control inputs of each of the at least one variable gain stages being connectable to an output of the digital-to-analogue converter, the outputs of the digital-to-analogue converter controlling the gain of the at least one variable gain stages.