EP0255652A2
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EP
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Power amplifier
Assignee: NTT Inc
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Filing: 1987-07-21
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Granted: —
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Expires: 2007-07-21
Abstract
Abstract An input signal is divided equally by a divider (31) and the equally divided outputs are applied to first and second amplifying means (32, 33), respectively. A filter means (41), 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 (45, 46) 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 (47), into a composite signal.
Inventors
- 👤 Toshio Nojima
- 👤 Sadayuki Nishiki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 07:41
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/60; H03F3/602; H03F3/604; H03F3/20; H03F3/21; H03F3/211
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
132 words
A power amplifier in which an input signal is divided equally by a divider (31), the divided outputs are applied to first and second amplifying means (32, 33), and the outputs from the first and second amplifying means are combined in phase with each other, by a combiner (47), into a composite signal, characterised by: a filter means (41) which is connected between the output sides of the first and second amplifying means (32, 33) and which rejects the fundamental frequency component of the input signal but passes therethrough its harmonic component; and first and second select circuits (45, 46) which are connected between the output sides of the first and second amplifying means and the combiner, respectively, and each of which passes therethrough the fundamental frequency component of the input signal.
Claim 2
Dependent Claim
132 words
A power amplifier in which an input signal is divided equally by a divider (31), the divided outputs are applied to first and second amplifying means (32, 33), and the outputs from the first and second amplifying means are combined in phase with each other, by a combiner (47), into a composite signal, characterised by: a filter means (41) which is connected between the output sides of the first and second amplifying means (32, 33) and which rejects the fundamental frequency component of the input signal but passes therethrough its harmonic component; and first and second select circuits (45, 46) which are connected between the output sides of the first and second amplifying means and the combiner, respectively, and each of which passes therethrough the fundamental frequency component of the input signal.
Claim 3
Dependent Claim
54 words
The power amplifier according to claim 1, wherein the filter means includes 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.
Claim 4
Dependent Claim
58 words
The power amplifier according to claim 2, wherein the filter means further passes therethrough at least a third order harmonic component such that voltages flowing thereinto and flowing out therefrom, for the third order harmonic component of the input signal, are rendered in phase to each other at the output sides of the first and second amplifying means.
Claim 5
Dependent Claim
30 words
The power amplifier according to claim 2, wherein the filter means comprises a band pass filter which permits the passage therethrough of the second harmonic component of the input signal.
Claim 6
Dependent Claim
27 words
The power amplifier according to claim 4, wherein the band pass filter is a resonator which is resonant to the second harmonic component of the input signal.
Claim 7
Dependent Claim
30 words
The power amplifier according to claim 2, wherein the filter means comprises a band rejection filter which inhibits the passage therethrough of the fundamental frequency component of the input signal.
Claim 8
Dependent Claim
36 words
The power amplifier according to claim 2, wherein the filter means comprises a high pass filter which has a cutoff frequency intermediate between the fundamental frequency component and the second harmonic component of the input signal.
Claim 9
Dependent Claim
71 words
The power amplifier according to claim 1, wherein the filter means includes a phase shifter connected in series thereto for adjusting such that the second order harmonic component from the output of either one of the first and second amplifying means becomes 180° out of phase with respect to the second order harmonic component coming into the said output from the other one of the amplifying means via the filter means.
Claim 10
Dependent Claim
32 words
The power amplifier according to claim 1, wherein each of the first and second select circuits is a band rejection filter for rejecting the second order harmonic component of the input signal.
Claim 11
Dependent Claim
39 words
The power amplifier according to claim 1, wherein each of the first and second select circuits is a low pass filter having a cutoff frequency between the fundamental frequency and the second order harmonic frequency of the input signal.
Claim 12
Dependent Claim
16 words
The power amplifier according to claim 1, wherein the combiner is composed of a 90° hybrid.
Claim 13
Dependent Claim
20 words
The power amplifier according to claim 1, wherein the first and second amplifying means are class "B" bias amplifying means.
References Cited (Backward Citations)
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