Systems and methods for switching mode power amplifier control
First Claim
1. A power-amplifier system, comprising:
- a driver amplifier that is operative to receive an input signal and generate an amplified input signal;
a circuit for receiving a power control signal and generating a first control bias signal for adjusting an operation of the driver amplifier;
a power amplifier that is operative to receive the amplified input signal and generate an output signal; and
a feedback loop that receives the power control signal and generates a second control bias signal for adjusting an operation of the power amplifier, wherein the feedback loop comprises;
a sensing block that detects a parameter associated with the output signal of the power amplifier, anda comparator that compares the detected parameter or a variation of the detected parameter to the received power control signal, wherein based upon the comparison, the comparator generates a compensation signal associated with the second control bias signal, wherein the sensing block comprises a current sensing block for detecting current associated with the output signal, wherein the detected current is converted to a detected voltage, and wherein the comparator compares the detected voltage to the power control signal in generating the compensation signal associated with the second control bias signal.
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Accused Products
Abstract
Embodiments of the invention may provide for enhancement systems and methods for a power amplifier output control system. In an example embodiment, driver amplifier control may be provided in conjunction with power amplifier control to improve the power efficiency and/or dynamic range of the transmitter system. Furthermore, control over the driver amplifier may allow for relaxed power control slope, which may lessens the burden of digital to analog converters (DACs) in transmitter systems such as cellular transmitter systems. Also, systems and methods in accordance with example embodiments of the invention may provide a less sensitive solution to operational environment variations such as temperature, battery power voltage and implementation IC process.
148 Citations
24 Claims
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1. A power-amplifier system, comprising:
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a driver amplifier that is operative to receive an input signal and generate an amplified input signal; a circuit for receiving a power control signal and generating a first control bias signal for adjusting an operation of the driver amplifier; a power amplifier that is operative to receive the amplified input signal and generate an output signal; and a feedback loop that receives the power control signal and generates a second control bias signal for adjusting an operation of the power amplifier, wherein the feedback loop comprises; a sensing block that detects a parameter associated with the output signal of the power amplifier, and a comparator that compares the detected parameter or a variation of the detected parameter to the received power control signal, wherein based upon the comparison, the comparator generates a compensation signal associated with the second control bias signal, wherein the sensing block comprises a current sensing block for detecting current associated with the output signal, wherein the detected current is converted to a detected voltage, and wherein the comparator compares the detected voltage to the power control signal in generating the compensation signal associated with the second control bias signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A power-amplifier system, comprising:
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a driver amplifier that amplifies a radio frequency (RF) input to generate an amplified input signal, wherein a first control of the driver amplifier is responsive to a power control signal in delivering a first bias signal to the driver amplifier; and a power amplifier that amplifies the amplified input signal to generate a RF output, wherein a second control of the power amplifier is responsive to the power control signal and a detected parameter associated with the RF output in delivering a second bias signal to the power amplifier, wherein the first control is operative to vary the first bias signal at a lower range of the power control signal, and wherein the first control is operative to hold the first bias signal substantially constant at a higher range of the power control signal. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A power-amplifier system, comprising:
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a driver amplifier that is operative to receive an input signal and generate an amplified input signal; a circuit for receiving a power control signal and generating a first control bias signal for adjusting an operation of the driver amplifier; a power amplifier that is operative to receive the amplified input signal and generate an output signal; and a feedback loop that receives the power control signal and generates a second control bias signal for adjusting an operation of the power amplifier, wherein the feedback loop comprises; a sensing block that detects a parameter associated with the output signal of the power amplifier, and a comparator that compares the detected parameter or a variation of the detected parameter to the received power control signal, wherein based upon the comparison, the comparator generates a compensation signal associated with the second control bias signal, wherein the sensing block comprises a voltage sensing block for detecting a voltage associated with the output signal, and wherein the comparator compares the detected voltage or a scaled version of the detected voltage to the power control signal in generating the compensation signal associated with the second control bias signal. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification