Amplifier
First Claim
1. Apparatus for amplifying an input signal provided in polar format comprising an amplitude component and a phase component to produce an output signal, the apparatus comprising a biaser configured to derive a bias signal from the amplitude component, a combiner configured to combine the bias signal with the phase component to produce a biased phase component signal, and an amplifier whose gain depends upon the bias provided to the signal it amplifies, wherein the amplifier is supplied with the biased phase component signal to produce the output signal.
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Accused Products
Abstract
A signal to be amplified is provided in polar format comprising an amplitude component (210) and a phase component (212). The amplitude component (210) is used to bias the phase component (212). The gain of amplifier (220) depends upon the bias of the signal that it receives. Therefore, the bias given to the phase component (212) provides the envelope characteristics of the output signal (224) of amplifier (220). Both (or either) of the amplitude component (210) and the phase component (212) may be predistorted (226, 310) to eliminate distortion appearing in the output signal (224).
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Citations
16 Claims
- 1. Apparatus for amplifying an input signal provided in polar format comprising an amplitude component and a phase component to produce an output signal, the apparatus comprising a biaser configured to derive a bias signal from the amplitude component, a combiner configured to combine the bias signal with the phase component to produce a biased phase component signal, and an amplifier whose gain depends upon the bias provided to the signal it amplifies, wherein the amplifier is supplied with the biased phase component signal to produce the output signal.
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16. A method of amplifying an input signal to produce an output signal, comprising the steps of:
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(a) providing the input signal in polar format comprising an amplitude component and a phase component;
(b) deriving a bias signal from the amplitude component, (c) combining the bias signal with the phase component to produce a biased phase component signal; and
(d) amplifying the biased phase component signal to produce the output signal using an amplifier whose gain depends upon the bias provided to the signal which it amplifies.
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Specification