Automatic gain control
First Claim
1. A method for controlling gain of an amplifier for received radio signals in a radio receiver, the radio receiver having a controllable gain responsive to an automatic gain control signal, the method comprising:
- amplifying the received radio frequency signals;
level detecting at least two down converted signals resulting from the amplified radio frequency signals; and
generating the automatic gain control signal such that the controllable gain maintains at least two down converted signal levels at less than a predetermined limit level, wherein generating the automatic gain control signal comprises;
varying a time constant of the automatic gain control signal in response to a time derivative parameter of the at least two down converted signals such that the automatic gain control signal is adapted to a power variation rate of the received radio frequency signals, the time constant varied using a combination of the at least two down converted signal levels.
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Accused Products
Abstract
A method for controlling gain of an amplifier includes amplifying one or more received signals to produce one or more amplified signals. The method also includes generating a plurality of down converted signals using the one or more amplified signals. The method further includes amplifying the plurality of down converted signals based on a gain control signal. In addition, the method includes varying a time constant of the gain control signal based on a time derivative parameter associated with the plurality of down converted signals.
8 Citations
41 Claims
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1. A method for controlling gain of an amplifier for received radio signals in a radio receiver, the radio receiver having a controllable gain responsive to an automatic gain control signal, the method comprising:
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amplifying the received radio frequency signals;
level detecting at least two down converted signals resulting from the amplified radio frequency signals; and
generating the automatic gain control signal such that the controllable gain maintains at least two down converted signal levels at less than a predetermined limit level, wherein generating the automatic gain control signal comprises;
varying a time constant of the automatic gain control signal in response to a time derivative parameter of the at least two down converted signals such that the automatic gain control signal is adapted to a power variation rate of the received radio frequency signals, the time constant varied using a combination of the at least two down converted signal levels.
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2. A method for controlling gain of an amplifier, comprising:
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amplifying one or more received signals to produce one or more amplified signals;
generating a plurality of down converted signals using the one or more amplified signals;
amplifying the plurality of down converted signals based on a gain control signal; and
varying a time constant of the gain control signal based on a time derivative parameter associated with the plurality of down convened signals by generating a plurality of signal levels based on the down converted signals, combining the plurality of signal levels, and using the combined signal levels to generate the gain control signal. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A receiver, comprising:
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at least one first amplifier operable to amplify one or more received signals;
a down converter operable to generate a plurality of down converted signals using the one or more amplified signals;
at least one second amplifier operable to amplify the plurality of down converted signals based on a gain control signal; and
a gain control loop operable to vary a time constant of the gain control signal based on a time derivative parameter associated with the plurality of down converted signals by generating a plurality of signal levels based on the down converted signals, combining the plurality of signal levels, and using the combined signal levels to generate the gain control signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A computer readable medium, having a program recorded thereon, wherein the program is operable when executed to:
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vary a time constant of a gain control signal based on a time derivative parameter associated with a plurality of down converted signals by generating a plurality of signal levels based on the down converted signals, combining the plurality of signal levels, and using the combined signal levels to generate the gain control signal;
wherein the plurality of down converted signals are generated using one or more amplified received signals, and the plurality of down converted signals are further amplified based on the gain control signal. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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35. A computer program loadable into the internal memory of a digital computer, comprising:
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computer readable program code for varying a time constant of a gain control signal based on a time derivative parameter associated with a plurality of down converted signals by generating a plurality of signal levels based on the down converted signals, combining the plurality of signal levels, and using the combined signal levels to generate the gain control signal;
wherein the plurality of down convened signals are generated using one or more amplified received signals, and the plurality of down converted signals are further amplified based on the gain control signal. - View Dependent Claims (36, 37, 38, 39, 40, 41)
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Specification