Automatic gain control circuit
First Claim
1. An automatic gain control circuit including:
- a variable gain amplifier adapted to receive a received signal and to output an amplified signal to an analog to digital converter,and a gain controller which is connected to said variable gain amplifier for receiving said amplified signal and for controlling a gain of said variable gain amplifier, wherein the gain controller is adapted to;
determine an occurrence of a threshold event each time the amplified signal has reached a predetermined threshold,decrease the gain of the variable gain amplifier at each occurrence of a threshold event,measure a delay since the last threshold event,increase the gain of the variable gain amplifier if the delay is greater than a delay specified value and if the gain of the variable gain amplifier is not maximum.
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Accused Products
Abstract
An automatic gain control circuit including a variable gain amplifier (11) adapted to receive a received signal (R) and to output an amplified signal (A) to an analog to digital converter (20), and a gain controller (12) which is connected to said variable gain amplifier (11) for receiving said amplified signal (A) and for controlling a gain of said variable gain amplifier (11). The gain controller (12) is adapted to determine an occurrence of a threshold event each time the amplified signal (A) has reached a predetermined threshold, decrease the gain of the variable gain amplifier (11) at each occurrence of a threshold event, measure a delay since the last threshold event, increase the gain of the variable gain amplifier (11) if the delay is greater than a delay specified value and if the gain of the variable gain amplifier (11) is not maximum.
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Citations
17 Claims
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1. An automatic gain control circuit including:
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a variable gain amplifier adapted to receive a received signal and to output an amplified signal to an analog to digital converter, and a gain controller which is connected to said variable gain amplifier for receiving said amplified signal and for controlling a gain of said variable gain amplifier, wherein the gain controller is adapted to; determine an occurrence of a threshold event each time the amplified signal has reached a predetermined threshold, decrease the gain of the variable gain amplifier at each occurrence of a threshold event, measure a delay since the last threshold event, increase the gain of the variable gain amplifier if the delay is greater than a delay specified value and if the gain of the variable gain amplifier is not maximum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for automatic gain control of a variable gain amplifier amplifying a received signal and outputting an amplified signal comprising:
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determining an occurrence of a threshold event each time the amplified signal has reached a predetermined threshold, decreasing the gain of the variable gain amplifier at each occurrence of a threshold event, measuring a delay since the last threshold event, increasing the gain of the variable gain amplifier if the delay is greater than a delay specified value and if the gain of the variable gain amplifier is not maximum. - View Dependent Claims (13)
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14. A method for automatic gain control of a variable gain amplifier amplifying a received signal and outputting an amplified signal comprising:
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determining an occurrence of a threshold event each time the amplified signal has reached a predetermined threshold, decreasing the gain of the variable gain amplifier at each occurrence of a threshold event; measuring a delay since the last threshold event, increasing the gain of the variable gain amplifier if the delay is greater than a delay specified value and if the gain of the variable gain amplifier is not maximum; and providing a gain controller, and adapting the gain controller to command the change of gain of the variable gain amplifier between two samples of an analog to digital converter conversion. - View Dependent Claims (15, 16, 17)
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Specification