Power Amplifier With Output Power Control
First Claim
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1. A power amplifier comprising:
- a first stage that receives a radio frequency (RF) signal, which controls power by voltage regulation, and outputs power based on an operating voltage;
a voltage regulator that regulates the operating voltage and compares the operating voltage with a control voltage and changes the operating voltage, if there is a difference between the operating voltage and the control voltage;
an isolating device that couples power from the first stage, wherein isolating device isolates the first stage from signals other than the RF signal; and
a second stage that receives the coupled power from the isolating device.
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Abstract
This disclosure relates systems and methods for a power amplifier with output power control. The power amplifier can include multiple stages of amplification. An RF signal is fed to the power amplifier with output control that amplifies the power of the RF signal to meet operational requirements. A first stage of the power amplifier controls the output power via voltage regulation. An isolating device is introduced in the transmission path of the RF signal between the first stage and the following stages of the power amplifier. The isolating device ensures that the load impedance of the first stage remains fixed at a constant value.
43 Citations
20 Claims
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1. A power amplifier comprising:
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a first stage that receives a radio frequency (RF) signal, which controls power by voltage regulation, and outputs power based on an operating voltage; a voltage regulator that regulates the operating voltage and compares the operating voltage with a control voltage and changes the operating voltage, if there is a difference between the operating voltage and the control voltage; an isolating device that couples power from the first stage, wherein isolating device isolates the first stage from signals other than the RF signal; and a second stage that receives the coupled power from the isolating device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising:
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a pre-amplifier that receives an input signal and amplifies the input signal; a radio frequency (RF) modulator that converts the input signal to an RF signal; and a power amplifier that increases the efficiency of the RF signal, comprised of; a) multiple stages for signal amplification, wherein power control in a first stage is achieved by voltage regulation, and power control in following stages is performed by current regulation; b) an isolating device that maintains load impedance of the first stage by preventing return signals in a transmission path to the first stage. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for method for output power control in a power amplifier comprising:
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receiving a radio frequency (RF) signal at a first stage; setting an operating voltage of the power amplifier at the first stage; maintaining a constant load impedance at the first stage; and regulating bias current at stages following the first stage. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification