Linear power amplifier with automatic gate/base bias control for optimum efficiency
First Claim
1. An electronic system having a dynamic power amplifier comprising:
- input amplifier adapted to receive an input signal having a given power signal level adapted to provide an amplifier output signal having a given power output signal level;
a power sensor configured to receive said power output signal and to generate a power indication signal corresponding to said power output signal;
a converter adapted to receive said power indication signal in order to generate a biasing signal corresponding to said power indication signal, said biasing signal applied to said input amplifier so that the operating bias point of said power amplifier varies as a function of said power indication signal such that the power added efficiency of said power amplifier remains substantially constant.
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Accused Products
Abstract
A dynamic power amplifier advantageously employed in a wireless terminal for transferring and receiving signals from a base terminal includes an input amplifier adapted to receive an input signal having a given power signal level corresponding to the distance of said wireless terminal to the terminal and adapted to provide an amplifier output signal having a given power output signal level. The dynamic amplifier further includes a power sensor configured to receive the power output signal and to generate a power indication signal corresponding to the power output signal, and a converter adapted to receive the power indication signal in order to generate a biasing signal corresponding to the power indication signal. The biasing signal is applied to the input amplifier so that the operating bias point of the power amplifier varies as a function of the power indication signal.
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Citations
11 Claims
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1. An electronic system having a dynamic power amplifier comprising:
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input amplifier adapted to receive an input signal having a given power signal level adapted to provide an amplifier output signal having a given power output signal level; a power sensor configured to receive said power output signal and to generate a power indication signal corresponding to said power output signal; a converter adapted to receive said power indication signal in order to generate a biasing signal corresponding to said power indication signal, said biasing signal applied to said input amplifier so that the operating bias point of said power amplifier varies as a function of said power indication signal such that the power added efficiency of said power amplifier remains substantially constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for dynamically controlling a power amplifier employed in a wireless terminal used for transmitting to a base terminal, said method comprising the steps of:
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generating a given power output signal in response to an input signal applied to said power amplifier, said power output signal having a given power signal corresponding to the distance of said wireless terminal to said base terminal; generating a power indication signal corresponding to said power output signal; generating a biasing signal corresponding to said power indication signal so as to vary the biasing point of said power amplifier as a function of said power indication signal such that the power added efficiency of said amplifier remains substantially constant. - View Dependent Claims (11)
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Specification