Providing automatic power control for a power amplifier
First Claim
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1. An apparatus comprising:
- a power control circuit to receive a feedback signal from a power amplifier (PA) and to generate a first control signal to control a variable gain amplifier (VGA) based on the feedback signal, wherein the VGA is coupled to an input to the PA, the power control circuit including;
a mute circuit to generate a mute signal to be provided to the VGA when the first control signal is less than a first level; and
a clamp circuit to clamp a second control signal from exceeding a threshold level, the second control signal used to generate the first control signal.
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Abstract
A power control circuit is coupled to receive a feedback signal from a power amplifier (PA) and generate a control signal to control a variable gain amplifier (VGA) coupled to an input to the PA based on the feedback signal. The power control circuit may include, in one embodiment, a mute circuit to generate a mute signal to be provided to the VGA when the control signal is less than a first level and a clamp circuit to clamp a control voltage used to generate the control signal from exceeding a threshold level.
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Citations
20 Claims
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1. An apparatus comprising:
a power control circuit to receive a feedback signal from a power amplifier (PA) and to generate a first control signal to control a variable gain amplifier (VGA) based on the feedback signal, wherein the VGA is coupled to an input to the PA, the power control circuit including; a mute circuit to generate a mute signal to be provided to the VGA when the first control signal is less than a first level; and a clamp circuit to clamp a second control signal from exceeding a threshold level, the second control signal used to generate the first control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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receiving a feedback signal from an output of a power amplifier (PA); combining a feedback current generated from the feedback signal with an offset current and a ramp current to obtain a current sum, and providing the current sum to an integrator having an integrator output; providing a control signal to a variable gain amplifier (VGA) and amplifying a radio frequency (RF) signal using the VGA and at least one gain stage coupled between the VGA and the PA when the integrator output is within a first range; and providing a mute signal that prevents a feed through signal from being amplified in at least one of the VGA and the at least one gain stage when the integrator output is within a second range in which the control signal is not provided. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A system comprising:
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a processor; a transmitter coupled to the processor and including; a variable gain amplifier (VGA) to receive and amplify a radio frequency (RF) signal; at least one gain stage coupled to an output of the VGA to further amplify the RF signal; a power amplifier (PA) coupled to the at least one gain stage to amplify the RF signal for transmission from the transmitter; and a power control circuit to receive a feedback signal from the PA to control the VGA based on the feedback signal, wherein the power control circuit is to enable the VGA during an on-keying state, and to disable the VGA during an off-keying state, and to further provide a mute signal to the VGA during the off-keying state to prevent a feed through signal from being amplified by the VGA. - View Dependent Claims (19, 20)
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Specification