Amplifier compression adjustment circuit
First Claim
1. A radio frequency (RF) power amplifier system, comprising:
- a power amplifier coupled to receive and amplify an RF input signal to generate an RF output signal; and
a power amplifier controller including;
an amplitude control loop determining an amplitude correction signal indicative of an amplitude difference between an amplitude of the RF input signal and an attenuated amplitude of the RF output signal;
a variable gain amplifier receiving the amplitude correction signal and adjusting the amplitude of the RF input signal to the power amplifier based upon the amplitude correction signal;
a frequency selection module blocking frequency components of the amplitude correction signal below a predetermined frequency to output AC components of the amplitude correction signal;
a summation module summing a compression control signal and the AC components of the amplitude correction signal to generate a modified amplitude correction signal; and
a power supply adjusting a supply voltage or bias to the power amplifier based upon the modified amplitude correction signal.
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Accused Products
Abstract
An RF power amplifier system adjusts the supply voltage to the power amplifier based upon an amplitude correction signal indicating the amplitude difference between the amplitude of the RF input signal and an attenuated amplitude of the RF output signal of the power amplifier. A variable gain amplifier (VGA) adjusts the amplitude of the RF input signal, thus providing a second means of adjusting the amplitude of the output of the power amplifier. The gain of the VGA or the supply voltage to the power amplifier is controlled based on the AC components of the amplitude correction signal, while the DC components of the amplitude correction signal are blocked from controlling the VGA or the supply voltage to the power amplifier. The DC level of the gain control of the VGA, the average supply voltage to the power amplifier, or the closed loop gain of the overall amplitude correction loop is controlled separately by a compression control signal.
29 Citations
9 Claims
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1. A radio frequency (RF) power amplifier system, comprising:
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a power amplifier coupled to receive and amplify an RF input signal to generate an RF output signal; and a power amplifier controller including; an amplitude control loop determining an amplitude correction signal indicative of an amplitude difference between an amplitude of the RF input signal and an attenuated amplitude of the RF output signal; a variable gain amplifier receiving the amplitude correction signal and adjusting the amplitude of the RF input signal to the power amplifier based upon the amplitude correction signal; a frequency selection module blocking frequency components of the amplitude correction signal below a predetermined frequency to output AC components of the amplitude correction signal; a summation module summing a compression control signal and the AC components of the amplitude correction signal to generate a modified amplitude correction signal; and a power supply adjusting a supply voltage or bias to the power amplifier based upon the modified amplitude correction signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A radio frequency (RF) power amplifier system, comprising:
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a power amplifier coupled to receive and amplify an RF input signal to generate an RF output signal; and a power amplifier controller including; an amplitude control loop determining an amplitude correction signal indicative of an amplitude difference between an amplitude of the RF input signal and an attenuated amplitude of the RF output signal; a variable gain amplifier receiving the amplitude correction signal and adjusting the amplitude of the RF input signal to the power amplifier based upon the amplitude correction signal; and a power supply adjusting a supply voltage or bias to the power amplifier based upon the amplitude correction signal, wherein a closed loop gain of the amplitude control loop is adjusted by a compression control signal. - View Dependent Claims (9)
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Specification