Predistortion linearizer for power amplifier
First Claim
1. A predistortion linearizer for a power amplifier, comprising:
- first and second envelope detector circuits configured to detect an envelope of first and second signals, respectively;
a digital signal processor (DSP) coupled to compare output signals of the first and second envelope detector circuits to adjust a tally of a work function;
a work function generator coupled to receive the output signal of the first envelope detector circuit and the work function tally received from the DSP to generate a work function and output at least one control voltage; and
a vector modulator configured to distort the first signal in accordance with the at least one control voltage received from the work function generator and output a distortion compensation signal to a power amplifier.
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Abstract
The present invention relates to a predistortion linearizer for a power amplifier which is capable of improving nonlinear character of a high power amplifier. The predistortion linearizer for the power amplifier includes first and second envelope detectors, which separately detect an envelope of input signals and output signals, respectively, a DSP, which adjusts a tally of a work function by comparing the output signals of the first and the second envelope detector, and a work function generator, which generates a work function from an envelope of input signals to output gain and phase control voltage in accordance with work function tally inputted from the DSP. It also includes a vector modulator, which pre-distorts the input signal in accordance with the control voltages inputted from the work function generator to output a distortion compensation signal to the power amplifier.
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Citations
32 Claims
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1. A predistortion linearizer for a power amplifier, comprising:
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first and second envelope detector circuits configured to detect an envelope of first and second signals, respectively;
a digital signal processor (DSP) coupled to compare output signals of the first and second envelope detector circuits to adjust a tally of a work function;
a work function generator coupled to receive the output signal of the first envelope detector circuit and the work function tally received from the DSP to generate a work function and output at least one control voltage; and
a vector modulator configured to distort the first signal in accordance with the at least one control voltage received from the work function generator and output a distortion compensation signal to a power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A predistortion linearizer for a power amplifier, comprising:
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first and second envelope detectors configured to detect an envelope of an input signal and an output signal, respectively;
a digital signal processor (DSP) coupled to receive an output of the first and second envelope detectors, adjust a tally of a work function by comparing the output signals, and generate the work function using an output of the first envelope detector and the work function tally to output a gain control voltage and a phase control voltage; and
a vector modulator coupled to receive the gain and phase control voltages and distort the input signal in accordance with the gain and phase control voltages to output a distortion compensation signal to a power amplifier. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A predistortion linearizer for a power amplifier, comprising:
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a first squaring circuit, which squares a first envelope signal;
a second squaring circuit, which squares an output of the first squaring circuit;
a first control voltage generator, which generates a first control voltage based on an output of the first squaring circuit, an output of the second squaring circuit, and a tally signal;
a second control voltage generator, which generates a second control voltage based on the output of the first squaring circuit, the output of the second squaring circuit, and the tally signal; and
a vector modulator, which distorts an input signal in accordance with the first and second control voltages to provide a distortion signal as an input to a power amplifier. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of generating a predistortion signal for a power amplifier, comprising:
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detecting an envelope of first and second signals;
comparing a first detected envelope with a second detected envelope to generate a tally of a work function;
generating a work function using the output of the first envelope detector and the work function tally;
generating first and second control voltages in accordance with the work function;
distorting the first signal by vector modulating the first signal with the first and second control voltages. - View Dependent Claims (31, 32)
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Specification