Method and system for robustly linearizing a radio frequency power amplifier using vector feedback
First Claim
1. An apparatus comprising:
- a) an amplifier having an input for receiving an amplifier input signal and an output for producing an amplifier output signal in response to said amplifier input signal, said amplifier including a vector modulator for amplifying said amplifier input signal, said vector modulator having a gain adjustment signal input for receiving a gain adjustment signal and having a gain adjustable in response to said gain adjustment signal;
b) a gain error signal generator for producing a gain error signal dependent upon said amplifier input signal and said amplifier output signal, said gain error signal having real and imaginary components lying within pre-defined regions in a complex plane;
c) a gain adjustment signal generator for generating said gain adjustment signal such that said gain adjustment signal is dependent upon which region in said complex plane said real and imaginary components lie in.
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Abstract
A method of linearizing an amplifier having an input and an output involves the steps of amplifying the amplifier input signal with a vector modulator having a gain adjustment signal input for receiving a gain adjustment signal and adjusting the gain of the vector modulator in response to a gain adjustment signal to produce an amplifier output signal at the amplifier output. This is followed by producing a gain error signal dependent upon the amplifier input signal and the amplifier output signal, the gain error signal having real and imaginary components lying within pre-defined regions in a complex plane. Finally, the gain adjustment signal is generated in response to a region in the complex plane in which an error signal vector defined by the real an imaginary components of the error signal vector lies.
141 Citations
28 Claims
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1. An apparatus comprising:
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a) an amplifier having an input for receiving an amplifier input signal and an output for producing an amplifier output signal in response to said amplifier input signal, said amplifier including a vector modulator for amplifying said amplifier input signal, said vector modulator having a gain adjustment signal input for receiving a gain adjustment signal and having a gain adjustable in response to said gain adjustment signal; b) a gain error signal generator for producing a gain error signal dependent upon said amplifier input signal and said amplifier output signal, said gain error signal having real and imaginary components lying within pre-defined regions in a complex plane; c) a gain adjustment signal generator for generating said gain adjustment signal such that said gain adjustment signal is dependent upon which region in said complex plane said real and imaginary components lie in. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of linearizing an amplifier having an input and an output, the method including the steps of:
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a) amplifying said amplifier input signal with a vector modulator having a gain adjustment signal input for receiving a gain adjustment signal and adjusting the gain of said vector modulator in response to a gain adjustment signal to produce an amplifier output signal at said amplifier output; b) producing a gain error signal dependent upon said amplifier input signal and said amplifier output signal, said gain error signal having real and imaginary components lying within pre-defined regions in a complex plane; c) generating said gain adjustment signal such that said gain adjustment signal is dependent upon which region in said complex plane said real and imaginary components of said error signal vector lie in. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification