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US6177841B1
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High frequency power amplifier
Assignee: Murata Manufacturing Co Ltd
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Filing: 1999-02-26
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Granted: 2001-01-23
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Expires: 2019-02-26
Abstract
Abstract A high frequency power amplifier with reduced power loss and improved power amplification efficiency has an output matching circuit providing an open circuit to a second harmonic and a short circuit to a third harmonic of a high frequency signal. This is accomplished by, for example, adjusting lengths of a drain bias line and a plurality of signal lines so that the phase of S parameter S11 (input reflection coefficient) to the second harmonic is from −80° to 140°, and the phase of S parameter S11 to the third harmonic is from 160° to 220°. The line length of each line in an input matching circuit is also adjusted so that the phase of S parameter S22 (output reflection coefficient) at the fundamental frequency is between +5° to −75°.
Inventors
- 👤 Akira Ohta
- 👤 Akira Inoue
- 👤 Tetsuya Heima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:17
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/60; H03F3/601; H03F1/00; H03F1/02; H03F1/0205; H03F1/56; H03F1/565
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
172 words
A high frequency power amplifier for amplifying a high frequency comprising: an amplifier element for amplifying a high frequency signal; and an output matching circuit for impedance matching an amplified high frequency signal output from an output terminal of said amplifier element and comprising an odd harmonic matching circuit providing a short circuit load to at least one odd harmonic of the amplified high frequency signal and including a bias line for supplying a bias voltage from an external source to said output terminal of said amplifier element, said bias line having a length so that a phase angle of the odd harmonic has a predetermined value, an even harmonic matching circuit providing an open circuit to at least one even harmonic of the amplified high frequency signal, and a fundamental wave matching circuit for impedance matching a fundamental wave of the amplified high frequency signal, wherein said matching circuits are connected to the output terminal of said amplifier element in series from the highest order of harmonic to be impedance matched.
Claim 2
Dependent Claim
172 words
A high frequency power amplifier for amplifying a high frequency comprising: an amplifier element for amplifying a high frequency signal; and an output matching circuit for impedance matching an amplified high frequency signal output from an output terminal of said amplifier element and comprising an odd harmonic matching circuit providing a short circuit load to at least one odd harmonic of the amplified high frequency signal and including a bias line for supplying a bias voltage from an external source to said output terminal of said amplifier element, said bias line having a length so that a phase angle of the odd harmonic has a predetermined value, an even harmonic matching circuit providing an open circuit to at least one even harmonic of the amplified high frequency signal, and a fundamental wave matching circuit for impedance matching a fundamental wave of the amplified high frequency signal, wherein said matching circuits are connected to the output terminal of said amplifier element in series from the highest order of harmonic to be impedance matched.
Claim 3
Dependent Claim
76 words
The high frequency power amplifier according to claim 1 , further comprising an input matching circuit for impedance matching a high frequency signal input to an input terminal of said amplifier element, wherein a reflection coefficient observed from the input terminal of said amplifier element to said input matching circuit is set so that a phase angle of the fundamental wave is within +5° to −75° of a phase angle at which maximum gain is obtained.
Claim 4
Dependent Claim
38 words
The high frequency power amplifier according to claim 1 , wherein said output impedance matching circuit impedance matches to each harmonic in sequence from a high order harmonic of the high frequency signal amplified by the amplifier element.
Claim 5
Dependent Claim
53 words
The high frequency power amplifier according to claim 1 , wherein a reflection coefficient of said odd harmonic matching circuit observed from said output terminal of said amplifier element to said output matching circuit is set so that the phase angle of the odd harmonic is in a range of 160° to 220°.
Claim 6
Dependent Claim
44 words
The high frequency power amplifier according to claim 1 , wherein said odd harmonic matching circuit comprises a first resonant circuit including a capacitor and parasitic inductor wherein said first resonant circuit resonates at a frequency of the odd harmonic to be impedance matched.
Claim 7
Dependent Claim
59 words
The high frequency power amplifier according to claim 5 , wherein said even harmonic matching circuit comprises a second resonant circuit including a capacitor and parasitic inductor, said second resonant circuit resonating at a frequency of the even harmonic to be impedance matched, and a signal line for connecting said second resonant circuit and said odd harmonic matching circuit.
Claim 8
Dependent Claim
92 words
The high frequency power amplifier according to claim 6 , wherein said output matching circuit further comprises a bias line for supplying a bias voltage from an external source to said output terminal of said amplifier element, and said bias line and said signal line of said even harmonic matching circuit have lengths so the output impedance of said amplifier element to the even harmonic is an open circuit of high impedance, said output impedance of said amplifier element being an impedance observed from said amplifier element to said output matching circuit.
Claim 9
Dependent Claim
48 words
The high frequency power amplifier according to claim 6 , wherein the inductance of the parasitic inductor of said second resonant circuit in said even harmonic matching circuit is greater than the inductance of the parasitic inductor of said first resonant circuit in said odd harmonic matching circuit.
Claim 10
Dependent Claim
48 words
The high frequency power amplifier according to claim 7 , wherein the inductance of the parasitic inductor of said second resonant circuit in said even harmonic matching circuit is greater than the inductance of the parasitic inductor of said first resonant circuit in said odd harmonic matching circuit.
Claim 11
Dependent Claim
72 words
The high frequency power amplifier according to claim 5 , including a semiconductor substrate and a multiple layer matching substrate having a ground electrode layer, wherein said amplifier element is disposed on said semiconductor substrate, said output matching circuit is disposed on said multiple layer matching substrate, and said capacitor of said first resonant circuit is connected to said ground electrode layer of said multiple layer matching substrate through a via hole.
Claim 12
Dependent Claim
86 words
The high frequency power amplifier according to claim 5 , including a semiconductor substrate and a multiple layer matching substrate having a ground electrode layer having a conductor layer on a side surface wherein said amplifier element is disposed on said semiconductor substrate, said output matching circuit is disposed on said multiple layer matching substrate, and said capacitor of said first resonant circuit is connected to said ground electrode layer of said multiple layer matching substrate by means of said conductor layer on said matching substrate.
Claim 13
Dependent Claim
32 words
The high frequency power amplifier according to claim 5 , including a semiconductor substrate wherein said capacitor of said first resonant circuit and said amplifier element are located on said semiconductor substrate.
Claim 14
Dependent Claim
21 words
The high frequency power amplifier according to claim 6 , wherein said fundamental wave matching circuit comprises a low pass filter.
Claim 15
Dependent Claim
41 words
The high frequency power amplifier according to claim 6 , wherein said fundamental wave matching circuit comprises a low pass filter and a third resonant circuit, said resonance circuit resonating at a frequency of one of the even and odd harmonics.
Claim 16
Dependent Claim
26 words
The high frequency power amplifier according to claim 1 , wherein the even harmonic is a second harmonic, and the odd harmonic is a third harmonic.
Claim 17
Dependent Claim
166 words
A high frequency power amplifier for amplifying a high frequency comprising: an amplifier element for amplifying a high frequency signal; and an output matching circuit for impedance matching an amplifying high frequency signal output from an output terminal of said amplifier element and comprising an odd harmonic matching circuit providing a short circuit load to at least one odd harmonic of the amplified high frequency signal, an even harmonic matching circuit providing an open circuit to at least one even harmonic of the amplified high frequency signal, a first low pass filter connected between said odd harmonic matching circuit and even harmonic matching circuit, a fundamental wave matching circuit for impedance matching a fundamental wave of the amplified high frequency signal, and a second low pass filter connected between said even harmonic matching circuit and said fundamental wave matching circuit, wherein said matching circuits are connected to the output terminal of said amplifier element in series from the highest order of harmonic to be impedance matched.
Claim 18
Dependent Claim
166 words
A high frequency power amplifier for amplifying a high frequency comprising: an amplifier element for amplifying a high frequency signal; and an output matching circuit for impedance matching an amplifying high frequency signal output from an output terminal of said amplifier element and comprising an odd harmonic matching circuit providing a short circuit load to at least one odd harmonic of the amplified high frequency signal, an even harmonic matching circuit providing an open circuit to at least one even harmonic of the amplified high frequency signal, a first low pass filter connected between said odd harmonic matching circuit and even harmonic matching circuit, a fundamental wave matching circuit for impedance matching a fundamental wave of the amplified high frequency signal, and a second low pass filter connected between said even harmonic matching circuit and said fundamental wave matching circuit, wherein said matching circuits are connected to the output terminal of said amplifier element in series from the highest order of harmonic to be impedance matched.
Claim 19
Dependent Claim
76 words
The high frequency power amplifier according to claim 16 , further comprising an input matching circuit for impedance matching a high frequency signal input to an input terminal of said amplifier element, wherein a reflection coefficient observed from the input terminal of said amplifier element to said input matching circuit is set so that a phase angle of the fundamental wave is within +5° to −75° of a phase angle at which maximum gain is obtained.
Claim 20
Dependent Claim
38 words
The high frequency power amplifier according to claim 16 , wherein said output impedance matching circuit impedance matches to each harmonic in sequence from a high order harmonic of the high frequency signal amplified by the amplifier element.
Claim 21
Dependent Claim
44 words
The high frequency power amplifier according to claim 16 , wherein said odd harmonic matching circuit comprises a first resonance circuit including a capacitor and parasitic inductor wherein said first resonant circuit resonates at a frequency of the odd harmonic to be impedance matched.
Claim 22
Dependent Claim
60 words
The high frequency power amplifier according to claim 19 , wherein said even harmonic matching circuit comprises a second resonance circuit including a capacitor and parasitic inductor wherein said second resonance circuit resonates at a frequency of the even harmonic to be impedance matched, and a signal line for connecting said second resonance circuit and said odd harmonic matching circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-01-23 | 2004-07-24 | 2005-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-01-23 | 2008-07-24 | 2009-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-01-23 | 2012-07-24 | 2013-01-23 | $7700.00 | Window Closed / Lapsed |