Methods and apparatus for automatic gain control in broadband tuners
First Claim
1. An automatic gain control (AGC) for applying a variable gain to a broadband signal, the AGC comprising:
- a variable gain amplifier adapted to receive the broadband signal as an input, the variable gain amplifier configured to apply a variable gain to the broadband signal based on a value of a gain signal to provide an amplified broadband signal; and
a controller to provide the gain signal to the variable gain amplifier, the controller adapted to determine the value of the gain signal based on at least one characteristic of the amplified broadband signal.
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Abstract
In one aspect, an automatic gain control (AGC) for applying a variable gain to a broadband signal is provided. The AGC comprises a variable gain amplifier adapted to receive the broadband signal as an input, the variable gain amplifier configured to apply a variable gain to the broadband signal based on a value of a gain signal to provide an amplified broadband signal, and a controller to provide the gain signal to the variable gain amplifier, the controller adapted to determine the value of the gain signal based on at least one characteristic of the amplified broadband signal. In a further aspect, the one or more characteristic is a power characteristic of the broadband signal that facilitates control of the broadband signal within a desired power range.
27 Citations
39 Claims
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1. An automatic gain control (AGC) for applying a variable gain to a broadband signal, the AGC comprising:
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a variable gain amplifier adapted to receive the broadband signal as an input, the variable gain amplifier configured to apply a variable gain to the broadband signal based on a value of a gain signal to provide an amplified broadband signal; and
a controller to provide the gain signal to the variable gain amplifier, the controller adapted to determine the value of the gain signal based on at least one characteristic of the amplified broadband signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of controlling a gain applied to a broadband signal received by a tuner, the method comprising acts of:
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receiving, as an input, the broadband signal;
applying a first gain to the broadband signal to provide an amplified broadband signal;
detecting at least one characteristic of the amplified broadband signal; and
determining a second gain to be applied to the broadband signal based, at least in part, on the at least one characteristic. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A tuner for selecting a desired channel from a broadband signal having a plurality of channels, the tuner comprising:
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a pre-amplifier coupled to receive, as an input, the broadband signal, the pre-amplifier adapted to apply a variable gain to the broadband signal to provide an amplified broadband signal, wherein the pre-amplifier determines values of the variable gain based on at least one characteristic of the amplified broadband signal; and
at least one circuit coupled to received the amplified broadband signal as an input and adapted to select the desired channel by substantially removing other channels in the amplified broadband signal to provide a single channel signal. - View Dependent Claims (38, 39)
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Specification