Power amplifier
First Claim
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1. A power amplifier comprising:
- a divider for dividing an input signal into two signals;
first and second amplifying means connected to two outputs of the divider, respectively, for producing harmonics of the input signal;
filter means connected between the output sides of the first and second amplifying means, for rejecting the fundamental wave component of the input signal but passing therethrough at least a second order harmonic component of the input signal, said filter means including phase inversion means by which voltages flowing thereinto and flowing out therefrom, for the second order harmonic of the input signal, are rendered opposite in phase from each other at the output side of each of the first and second amplifying means;
first and second select circuits connected to the output sides of the first and second amplifying means, respectively, for passing therethrough the fundamental wave component of the input signal; and
a combiner for combining the outputs from the first and second select circuits in phase with each other.
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Abstract
An input signal is divided equally by a divider and the equally divided outputs are applied to first and second amplifying means, respectively. A filter means, which rejects the fundamental wave component of the input signal but passes therethrough its harmonic component, is connected between the first and second amplifying means. The outputs of the first and second amplifying means are respectively connected to first and second select circuits which select the fundamental wave components of the input signal. The outputs from the first and second circuits are combined in phase with each other, by a combiner, into a composite signal.
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Citations
12 Claims
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1. A power amplifier comprising:
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a divider for dividing an input signal into two signals; first and second amplifying means connected to two outputs of the divider, respectively, for producing harmonics of the input signal; filter means connected between the output sides of the first and second amplifying means, for rejecting the fundamental wave component of the input signal but passing therethrough at least a second order harmonic component of the input signal, said filter means including phase inversion means by which voltages flowing thereinto and flowing out therefrom, for the second order harmonic of the input signal, are rendered opposite in phase from each other at the output side of each of the first and second amplifying means; first and second select circuits connected to the output sides of the first and second amplifying means, respectively, for passing therethrough the fundamental wave component of the input signal; and a combiner for combining the outputs from the first and second select circuits in phase with each other. - View Dependent Claims (8, 9, 10, 11, 12)
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2. A power amplifier comprising:
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a divider for dividing an input signal into two signals; first and second amplifying means connected to two outputs of said divider, respectively, each for producing harmonics of the input signal as well as a fundamental wave component thereof; filter means connected between the output sides of said first and second amplifying means, for rejecting the fundamental wave component of said input signal while passing therethrough at least a second order harmonic component of said input signal so that at least the second order harmonic component produced at the output of either of said first and second amplifying means is fed into the output of the other of said first and second amplifying means to cancel at least the second order harmonic component produced by said other first and second amplifying means; first and second select circuits connected to the output sides of said first and second amplifying means, respectively, for passing therethrough the fundamental component of said input signal; and a combiner for combining the outputs from said first and second select circuits in phase with each other to produce an output of said power amplifier. - View Dependent Claims (3, 4, 5, 6, 7)
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Specification