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Patent US4531098A successfully refreshed from Google Patents.
US4531098A
Expired / Lapsed
US
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Wide dynamic range amplifier with second harmonic signal cancellation
Assignee: General Dynamics Mission Systems Inc
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Filing: 1984-04-05
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Granted: 1985-07-23
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Expires: 2004-04-05
Abstract
Abstract The signal to be amplified is applied to a quadrature coupler which splits the signal equally to provide two output signals in phase quadrature. The quadrature signals are amplified equally, which generates a second harmonic in each of the signals 180 degrees out of phase. The amplified signals are combined in an in-phase power divider to provide a single amplified output signal wherein the out-of-phase second harmonic signals cancel.
Inventors
- 👤 John C. Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:51
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/60; H03F3/602; H03F1/00; H03F1/32; H03F1/3223
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
106 words
A wide dynamic range amplifier with second harmonic signal concellation comprising: a quadrature coupler having an input adapted to receive a signal to be amplified and a pair of outputs having output signals thereon which are in phase quadrature; amplifying means coupled to the pair of outputs for amplifying each of the output signals and providing two amplified output signals including second harmonic signals 180° out of phase; and an in-phase power divider having two inputs coupled to receive the two amplified output signals, said power divider combining the two signals to provide at an output thereof a single signal substantially free of second harmonic signals.
Claim 2
Dependent Claim
106 words
A wide dynamic range amplifier with second harmonic signal concellation comprising: a quadrature coupler having an input adapted to receive a signal to be amplified and a pair of outputs having output signals thereon which are in phase quadrature; amplifying means coupled to the pair of outputs for amplifying each of the output signals and providing two amplified output signals including second harmonic signals 180° out of phase; and an in-phase power divider having two inputs coupled to receive the two amplified output signals, said power divider combining the two signals to provide at an output thereof a single signal substantially free of second harmonic signals.
Claim 3
Dependent Claim
20 words
An amplifier as claimed in claim 1 wherein the quadrature coupler has a second input terminated in its characteristic impedance.
Claim 4
Dependent Claim
17 words
An amplifier as claimed in claim 1 wherein the amplifying means includes a plurality of amplifying stages.
Claim 5
Dependent Claim
18 words
An amplifier as claimed in claim 3 wherein the plurality of amplifying stages include quadrature couplers interspersed therebetween.
Claim 6
Dependent Claim
38 words
An amplifier as claimed in claim 4 wherein each of the interspersed quadrature couplers have a pair of inputs connected to the previous amplifying stage outputs and a pair of outputs connected to the following amplifying stage inputs.
Claim 7
Dependent Claim
22 words
An amplifier as claimed in claim 1 wherein the quadrature coupler splits the input signal substantially equally between the pair of outputs.
Claim 8
Dependent Claim
23 words
An amplifier as claimed in claim 6 wherein the amplifying means substantially equally amplifies each of the pair of output signals supplied thereof.
Claim 9
Dependent Claim
73 words
A wide dynamic range amplifier with second harmonic signal cancellation comprising: amplifying means coupled to receive a signal to be amplified at an input thereof and including a quadrature coupler for providing a pair of substantially equal output signals including second harmonic signals 180° out of phase; a combining circuit coupled to receive the pair of output signals and combine the signals to provide a single signal substantially free of second harmonic signals.
Claim 10
Dependent Claim
73 words
A wide dynamic range amplifier with second harmonic signal cancellation comprising: amplifying means coupled to receive a signal to be amplified at an input thereof and including a quadrature coupler for providing a pair of substantially equal output signals including second harmonic signals 180° out of phase; a combining circuit coupled to receive the pair of output signals and combine the signals to provide a single signal substantially free of second harmonic signals.
Claim 11
Independent Claim
83 words
A method of amplifying a useful signal without producing substantial second harmonic signal distortion comprising the steps of: quadrature coupling the useful signal to be amplified to a pair of output terminals so that the signals appearing at the pair of output terminals are substantially equal in amplitude and in phase quadrature; amplifying the signals appearing at the pair of output terminals substantially equally; and combining the two amplified signals to provide a single amplified useful signal substantially free of second harmonic signals.
Claim 12
Independent Claim
83 words
A method of amplifying a useful signal without producing substantial second harmonic signal distortion comprising the steps of: quadrature coupling the useful signal to be amplified to a pair of output terminals so that the signals appearing at the pair of output terminals are substantially equal in amplitude and in phase quadrature; amplifying the signals appearing at the pair of output terminals substantially equally; and combining the two amplified signals to provide a single amplified useful signal substantially free of second harmonic signals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |