US5329259A
Expired / Lapsed
US
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Efficient amplitude/phase modulation amplifier
Assignee: Motorola Solutions Inc
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Filing: 1993-02-11
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Granted: 1994-07-12
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Expires: 2013-02-11
Abstract
Abstract A high efficiency amplitude/phase modulation amplifier circuit (100) includes a first (102) and a second (106) high efficiency amplifier. These amplifiers (102 and 106) amplify two constant amplitude/phase modulated signals. A combiner (104) combines the output signals from the amplifiers (102) and (106) to produce a combined signal to a load (108). Two shunt elements (202 and 204) are included to prevent the reactive components of the combined signal from reaching the amplifiers (102) and (106). With no reactive components reflected back, the amplifiers (102 and 106) can remain non-linear even though they are used to amplify an amplitude/phase modulated signal which includes Amplitude Modulation (AM) components.
Inventors
- 👤 Robert E. Stengel
- 👤 Charles A. Backof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:13
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/36; H04L27/362; H03; H03F; H03F3/00; H03F3/20; H03F3/21; H03F3/217; H03F3/2176; H03F3/60; H03F3/602
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
73 words
An amplitude/phase modulation amplifier circuit coupled to a load, comprising: first amplifier for amplifying a first phase modulated signal to produce a first amplified signal; second amplifier for amplifying a second phase modulated signal to produce a second amplified signal; a combiner for combining the first and the second amplified signals with minimum reflection to produce a high efficiency amplified amplitude/phase modulated signal; and an isolator coupled to the combiner for maximizing efficiency.
Claim 2
Dependent Claim
73 words
An amplitude/phase modulation amplifier circuit coupled to a load, comprising: first amplifier for amplifying a first phase modulated signal to produce a first amplified signal; second amplifier for amplifying a second phase modulated signal to produce a second amplified signal; a combiner for combining the first and the second amplified signals with minimum reflection to produce a high efficiency amplified amplitude/phase modulated signal; and an isolator coupled to the combiner for maximizing efficiency.
Claim 3
Dependent Claim
15 words
The amplifier circuit of claim 1, wherein the first amplifier includes a constant output amplifier.
Claim 4
Dependent Claim
15 words
The amplifier circuit of claim 1, wherein the combiner includes an isolator for maximizing efficiency.
Claim 5
Dependent Claim
12 words
The amplifier circuit of claim 1, wherein the combiner includes a summer.
Claim 6
Dependent Claim
15 words
The amplifier circuit of claim 1, wherein the second amplifier includes a constant output amplifier.
Claim 7
Dependent Claim
148 words
A high efficiency amplitude/phase modulation amplifier circuit, comprising: a first amplifier for amplifying a first phase modulated signal, the first phase modulated signal having a fixed amplitude, a frequency, a fixed phase component, and a first variable phase component; a second amplifier for amplifying a second phase modulated signal, the second phase modulated signal having the fixed amplitude, the frequency, and the fixed phase component of the first phase modulated signal along with a second variable phase component; a combiner for combining the first and the second phase modulated signals to produce an amplified amplitude/phase modulated signal having a reactive component, the combiner having means for preventing the reactive component of the amplified amplitude/phase modulated signal from loading the first or the second amplifier; and an isolator for accommodating a variable load to appear fixed to the combiner in order to maximize the efficiency of the amplifier circuit.
Claim 8
Dependent Claim
148 words
A high efficiency amplitude/phase modulation amplifier circuit, comprising: a first amplifier for amplifying a first phase modulated signal, the first phase modulated signal having a fixed amplitude, a frequency, a fixed phase component, and a first variable phase component; a second amplifier for amplifying a second phase modulated signal, the second phase modulated signal having the fixed amplitude, the frequency, and the fixed phase component of the first phase modulated signal along with a second variable phase component; a combiner for combining the first and the second phase modulated signals to produce an amplified amplitude/phase modulated signal having a reactive component, the combiner having means for preventing the reactive component of the amplified amplitude/phase modulated signal from loading the first or the second amplifier; and an isolator for accommodating a variable load to appear fixed to the combiner in order to maximize the efficiency of the amplifier circuit.
Claim 9
Dependent Claim
16 words
The high efficiency amplifier circuit of claim 6, wherein the combiner includes a plurality of transformers.
Claim 10
Dependent Claim
37 words
The high efficiency amplifier circuit of claim 7, wherein the combiner includes an isolator for accommodating a variable load to appear fixed to the plurality of transformers in order to maximize the efficiency of the amplifier circuit.
Claim 11
Dependent Claim
18 words
The high efficiency amplifier circuit of claim 6, wherein the first and second amplifiers include class E amplifiers.
Claim 12
Dependent Claim
17 words
The high efficiency amplifier circuit of claim 6, wherein the first and second amplifiers include switching amplifiers.
Claim 13
Dependent Claim
120 words
A Quadrature Amplitude Modulation (QAM) transmitter, comprising: an oscillator for generating a carrier signal; a modulator for modulating the carrier signal to produce a first and a second phase modulated signal: a QAM amplifier circuit, the amplifier circuit comprising: first amplifier for amplifying the first phase modulated signal to produce a first amplified signal; second amplifier for amplifying the second phase modulated signal to produce a second amplified signal; a combiner for combining the first and the second amplified signals to produce an amplified QAM signal having a reactive component, the combiner having means for minimizing the reflection of the reactive component onto the first and second amplifiers in order to optimize efficiency; and an isolator coupled to the combiner.
Claim 14
Dependent Claim
120 words
A Quadrature Amplitude Modulation (QAM) transmitter, comprising: an oscillator for generating a carrier signal; a modulator for modulating the carrier signal to produce a first and a second phase modulated signal: a QAM amplifier circuit, the amplifier circuit comprising: first amplifier for amplifying the first phase modulated signal to produce a first amplified signal; second amplifier for amplifying the second phase modulated signal to produce a second amplified signal; a combiner for combining the first and the second amplified signals to produce an amplified QAM signal having a reactive component, the combiner having means for minimizing the reflection of the reactive component onto the first and second amplifiers in order to optimize efficiency; and an isolator coupled to the combiner.
Claim 15
Dependent Claim
20 words
The transmitter of claim 11, further comprising an antenna coupled to the QAM amplifier for transmitting the amplified QAM signal.
Claim 16
Dependent Claim
15 words
The transmitter of claim 11, wherein the first and second amplifiers include class E amplifiers.
References Cited (Backward Citations)
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