Patent US3270443A successfully refreshed from Google Patents.
Patent US5576660A successfully refreshed from Google Patents.
US5576660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband predistortion linearizer with automatic temperature compensation for microwave amplifiers
Assignee: Alcatel Espace Industries SA
•
Filing: 1995-05-05
•
Granted: 1996-11-19
•
Expires: 2015-05-05
Abstract
Abstract A predistortion linearizer for microwave power amplifiers has a linear channel and a non-linear channel. Both channels are made up of the same units. Each channel includes a variable phase-shifter, a variable attenuator and an amplifier. Each channel can further include a fixed attenuator. The two channels are coupled at their ends by couplers each introducing a phase-shift of 90° so that the total phase-shift is 180°. Because the components of the two channels are the same, any variations with the frequency or the amplitude of the signal or with the operating temperature cancel out. The linearizer has applications in telecommunications and in particular in multicarrier systems.
Inventors
- 👤 Michel Pouysegur
- 👤 François Nicolas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:30
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3241; H03F2200/00; H03F2200/198
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
A predistortion linearizer for microwave amplifiers including: an input power divider having one input and two outputs with a relative phase-shift of 90° between said two outputs; a linear channel and a non-linear channel, said linear and non-linear channels having substantially the same electrical length and comprising identical circuit elements; and an output power combiner having two inputs and one output with a relative phase-shift of 90° between said two inputs.
Claim 2
Dependent Claim
71 words
A predistortion linearizer for microwave amplifiers including: an input power divider having one input and two outputs with a relative phase-shift of 90° between said two outputs; a linear channel and a non-linear channel, said linear and non-linear channels having substantially the same electrical length and comprising identical circuit elements; and an output power combiner having two inputs and one output with a relative phase-shift of 90° between said two inputs.
Claim 3
Dependent Claim
15 words
Linearizer according to claim 1 wherein said power divider is a 3 dB hybrid coupler.
Claim 4
Dependent Claim
15 words
Linearizer according to claim 1 wherein said power combiner is a 3 dB hybrid coupler.
Claim 5
Dependent Claim
13 words
Linearizer according to claim 1 wherein said power divider is a branch-line coupler.
Claim 6
Dependent Claim
13 words
Linearizer according to claim 1 wherein said power combiner is a ring coupler.
Claim 7
Dependent Claim
15 words
Linearizer according to claim 1 at least part of which is implemented in MMIC technology.
Claim 8
Dependent Claim
15 words
Linearizer according to claim 1 at least part of which is implemented in MIC technology.
Claim 9
Dependent Claim
85 words
A microwave amplifier comprising: a predistortion linearizer including: an input power divider having one input and two outputs with a relative phase-shift of 90° between said two outputs; a linear channel and a non-linear channel, said linear and non-linear channels having substantially the same electrical length and comprising identical circuit elements; and an output power combiner having two inputs and one output with a relative phase-shift of 90° between said two inputs; and a power amplifier connected to the output of the output power combiner.
Claim 10
Dependent Claim
85 words
A microwave amplifier comprising: a predistortion linearizer including: an input power divider having one input and two outputs with a relative phase-shift of 90° between said two outputs; a linear channel and a non-linear channel, said linear and non-linear channels having substantially the same electrical length and comprising identical circuit elements; and an output power combiner having two inputs and one output with a relative phase-shift of 90° between said two inputs; and a power amplifier connected to the output of the output power combiner.
Claim 11
Dependent Claim
24 words
The linearizer according to claim 1, wherein the output of the output power combiner is connected to an input of a microwave power amplifier.
Claim 12
Dependent Claim
29 words
The linearizer according to claim 1, wherein the identical circuit elements of the linear and non-linear channels include: a microwave amplifier; a variable attenuator; and a variable phase shifter.
Claim 13
Dependent Claim
22 words
The linearizer according to claim 10, wherein the identical circuit elements of the linear and non-linear channels further include a fixed attenuator.
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) | 1999-11-19 | 2000-05-20 | 2000-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-19 | 2004-05-20 | 2004-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-19 | 2008-05-20 | 2008-11-19 | $7700.00 | Window Closed / Lapsed |