Output power control device
First Claim
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1. An output power control device for a transmission signal, comprising:
- a nonlinear power amplifier for controlling transmission power of said transmission signal;
a directional coupler for separating a part of an output of said nonlinear power amplifier;
a detector for obtaining a detected voltage by detecting said separated output;
a reference voltage generator for generating a reference voltage;
a comparator for comparing said detected voltage with said reference voltage to output the difference between as a first control voltage; and
a nonlinearity compensating circuit for converting said first control voltage into a second control voltage having a characteristic to compensate nonlinearity of said nonlinear power amplifier so that said second control voltage is made a control signal for varying an amplification factor of said nonlinear power amplifier.
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Abstract
A comparator (5) compares a detected voltage obtained by detecting an output power of a nonlinear amplifier (2) with a reference voltage to generate a control voltage for the nonlinear amplifier (2). The control voltage is converted into such a control voltage as to cancel the nonlinearity of the nonlinear amplifier (2) by a nonlinearity compensating circuit (7) and is supplied to the nonlinear amplifier (2). The nonlinear compensating circuit (7) is comprised of a diode (71) and a resistor (72).
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Citations
9 Claims
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1. An output power control device for a transmission signal, comprising:
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a nonlinear power amplifier for controlling transmission power of said transmission signal; a directional coupler for separating a part of an output of said nonlinear power amplifier; a detector for obtaining a detected voltage by detecting said separated output; a reference voltage generator for generating a reference voltage; a comparator for comparing said detected voltage with said reference voltage to output the difference between as a first control voltage; and a nonlinearity compensating circuit for converting said first control voltage into a second control voltage having a characteristic to compensate nonlinearity of said nonlinear power amplifier so that said second control voltage is made a control signal for varying an amplification factor of said nonlinear power amplifier. - View Dependent Claims (2, 3, 4)
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5. An output power control device for a transmission signal, comprising:
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nonlinear power amplifying means for controlling transmission power of said transmission signal; separating means for separating a part of an output of said nonlinear power amplifying means; detector means for detecting said separated output to obtain a detected voltage; reference voltage generating means for generating a reference voltage; comparing means for comparing said detected voltage with said reference voltage to output the difference between as a first control voltage; and nonlinearity compensating means for converting said first control voltage to a second control voltage having a characteristic to compensate nonlinearity of said nonlinear power amplifying means so that said second control voltage is made a control signal for varying an amplification factor of said nonlinear power amplifying means. - View Dependent Claims (6, 7, 8)
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9. A method of controlling power of a transmission signal as an output of a nonlinear power amplifier, said method comprising the steps of:
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detecting a voltage corresponding to power of a transmission signal; obtaining a difference by comparing said detected voltage with a reference voltage; generating a first control voltage corresponding to said obtained difference; converting said first control voltage into a second control voltage having a characteristic to compensate nonlinearity of said nonlinear power amplifier; and making said second control voltage a control signal for varying an amplification factor of said nonlinear power amplifier.
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Specification