Automatic gain control system and method
First Claim
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.
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Accused Products
Abstract
An automatic gain control system,comprises a number of variable gain stages connected in series and a number of sensors, the input of each sensor being connected to a respective output of the variable gain stages. The input of an analogue-to-digital converter is connected to the output of one of the variable gain stages. The input of a control unit is connected to the outputs of the sensors and to the output of the analogue-to-digital converter. The input of a digital-to-analogue converter is connected to the output of the control unit, and the control inputs of each of the variable gain stages is connected to an output of the digital-to-analogue converter. The outputs of the digital-to-analogue converter are used to control the gains of the variable gain stages. Also disclosed is a method for automatically controlling gain in a receiver system.
20 Citations
18 Claims
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1. An automatic gain control system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for automatically controlling gain in a receiver system comprising:
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amplifying an incoming signal using at least one variable gain stage connected in series, the at least one variable gain stages each having an output signal and a gain;
comparing the output signal of each of the variable gain stages with a reference level using at least one sensor to determine if the output signal is greater than or less than the reference level, each of said at least one sensors having an output;
if the output signal is greater than the reference level, setting the output of one or more of the at least one sensors;
passing the output signal from one of the at least one variable gain stages to an analogue-to-digital converter to digitise the output signal to form a digitised signal;
passing the digitised signal together with the output from one or more of the at least one sensors into a control logic unit to produce a digital signal; and
converting said digital signal to at least one analogue signal to control the gain of one or more of the variable gain stages. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification