Method and apparatus of a fast digital automatic gain control circuit
First Claim
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1. An automatic gain control circuit comprising:
- an amplifier having at least a received signal and an analog gain control signal as separate inputs, wherein the amplifier amplifies the received signal by a amplification factor which is controlled by the analog gain control signal;
an analog-to-digital converter configured to convert the amplified signal from analog format to digital format;
a signal strength estimator configured to measure the signal strength of the amplified signal;
a gain adjusting factor device configured to generate a gain adjusting factor;
a multiplier configured to multiply a digital gain control signal by said gain adjusting factor; and
a digital-to-analog converter configured to convert a gain control signal from digital format to analog format.
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Abstract
An automatic gain control circuit with a very wide operational range, less hardware, and faster response, and more flexibility includes a signal strength estimator, a gain adjusting factor device and a multiplier. After the signal strength estimator finds signal strength, the gain adjusting factor device will generate a gain adjusting factor corresponding to the signal strength. Then the multiplier will update gain by multiplying it the gain adjusting factor.
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Citations
20 Claims
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1. An automatic gain control circuit comprising:
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an amplifier having at least a received signal and an analog gain control signal as separate inputs, wherein the amplifier amplifies the received signal by a amplification factor which is controlled by the analog gain control signal;
an analog-to-digital converter configured to convert the amplified signal from analog format to digital format;
a signal strength estimator configured to measure the signal strength of the amplified signal;
a gain adjusting factor device configured to generate a gain adjusting factor;
a multiplier configured to multiply a digital gain control signal by said gain adjusting factor; and
a digital-to-analog converter configured to convert a gain control signal from digital format to analog format. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An automatic gain control circuit, comprising:
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an amplifier having at least a received signal and an analog gain control signal as separate inputs, wherein the amplifier amplifies the received signal by amplification factor which is controlled by the analog gain control signal;
a signal strength estimator configured to measure the strength of the amplified signal;
a first memory device configured to store a plurality of signal strengths;
a gain generating device configured to generate a gain; and
a second memory device configured to store a plurality of gains. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for automatically varying a gain control signal for a receiver, comprising the steps of
a) amplifying a received signal according to an adjustable amplification factor, wherein the adjustable amplification factor is determined by an analog gain control signal; -
b) converting the amplified signal from analog to digital format;
c) calculating the strength of the amplified signal;
d) generating new gain based on previous gains and signal strengths; and
e) converting the new gain from digital format into analog format to generate analog gain control signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification