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Patent US6639464B2 successfully refreshed from Google Patents.
US6639464B2
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US
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Composite amplifier
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 2002-12-05
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Granted: 2003-10-28
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Expires: 2022-12-05
Abstract
Abstract A composite amplifier includes a main power amplifier ( 10 ) and an auxiliary power amplifier ( 12 ), which are connected to a load ( 26 ) over a Doherty output network. An attenuator ( 34 ) is provided for activating the auxiliary power amplifier ( 12 ) before the main amplifier ( 10 ) is saturated. Preferably the input drive voltage to the auxiliary power amplifier ( 12 ) is increased along a smooth curve as the input signal amplitude to the composite amplifier increases.
Inventors
- 👤 Richard Hellberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:40
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/20; H03F3/24; H03F1/00; H03F1/02; H03F1/0205; H03F1/0288; H03F2200/00; H03F2200/102; H03F2200/451
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A composite amplifier including: a main amplifier and an auxiliary amplifier, which are connected to a load over a Doherty output network; and means for activating said auxiliary amplifier before said main amplifier is saturated by providing an auxiliary amplifier output current function that depends on the composite amplifier output voltage and has: (a) a non-zero auxiliary amplifier output current (i 2 ) below the main amplifier saturation point; and (b) a lower slope for non-zero low auxiliary amplifier output currents than for high auxiliary amplifier output currents.
Claim 2
Dependent Claim
88 words
A composite amplifier including: a main amplifier and an auxiliary amplifier, which are connected to a load over a Doherty output network; and means for activating said auxiliary amplifier before said main amplifier is saturated by providing an auxiliary amplifier output current function that depends on the composite amplifier output voltage and has: (a) a non-zero auxiliary amplifier output current (i 2 ) below the main amplifier saturation point; and (b) a lower slope for non-zero low auxiliary amplifier output currents than for high auxiliary amplifier output currents.
Claim 3
Dependent Claim
27 words
The composite amplifier of claim 1 , including an attenuator for attenuating the input signal to said auxiliary power amplifier in accordance with a predetermined attenuation function.
Claim 4
Dependent Claim
20 words
The composite amplifier of claim 2 , wherein said attenuation function is a low order polynomial of said input signal.
Claim 5
Dependent Claim
24 words
The composite amplifier of claim 2 , wherein said attenuation function is a low order polynomial in the squared magnitude of said input signal.
Claim 6
Dependent Claim
15 words
The composite amplifier of claim 2 , wherein said attenuator operates in the digital domain.
Claim 7
Dependent Claim
13 words
The composite amplifier of claim 5 , wherein said attenuator operates at baseband.
Claim 8
Dependent Claim
14 words
The composite amplifier of claim 5 , wherein said attenuator operates at intermediate frequency.
Claim 9
Dependent Claim
13 words
The composite amplifier of claim 5 , wherein said attenuator includes a pre-distorter.
Claim 10
Dependent Claim
15 words
The composite amplifier of claim 2 , wherein said attenuator operates in the analog domain.
Claim 11
Dependent Claim
14 words
The composite amplifier of claim 9 , wherein said attenuator operates at radio frequency.
References Cited (Backward Citations)
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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) | 2006-10-27 | 2007-04-28 | 2007-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-10-27 | 2011-04-28 | 2011-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-10-27 | 2015-04-28 | 2015-10-28 | $7700.00 | Window Closed / Lapsed |