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US6897721B2
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Composite amplifier with optimized linearity and efficiency
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 2002-03-27
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Granted: 2005-05-24
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Expires: 2022-03-27
Abstract
Abstract The invention relates to a composite amplifier ( 500 ) based on a main amplifier ( 510 ) and an auxiliary amplifier ( 520 ), and compensation for non-linear amplifier behavior by means of respective non-linear models ( 570, 575 ) of parasitic. In order to provide proper excitation of the non-linear models, a filter network ( 560 ) based on a linear model of the output network of the composite amplifier is provided. The linear filter network ( 550 ) basically determines ideal output node voltages, which are used as input to the respective non-linear models for generating appropriate compensation signals. The compensation signals are finally merged into the input signals of the respective sub-amplifiers ( 510, 520 ), thus effectively compensating for the effects of the non-linear parasitics.
Inventors
- 👤 Richard Hellberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:01
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/20; H03F3/24; H03F1/00; H03F1/02; H03F1/0205; H03F1/0288; H03F1/32; H04; H04B; H04B1/00; H04B1/02; H04B1/04; H04B1/0483; H03F2200/00; H03F2200/451
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
74 words
A linearization method for a composite amplifier having at least two sub-amplifiers, said method comprising: for at least one sub-amplifier: determining a sub-amplifier output signal based on a linear model of the output network of the composite amplifier; and emulating and compensating for, in the input signal to the sub-amplifier, a non-linear amplifier behavior based on a non-linear model of a sub-amplifier parasitic using the determined sub-amplifier output signal as input to the model.
Claim 2
Dependent Claim
74 words
A linearization method for a composite amplifier having at least two sub-amplifiers, said method comprising: for at least one sub-amplifier: determining a sub-amplifier output signal based on a linear model of the output network of the composite amplifier; and emulating and compensating for, in the input signal to the sub-amplifier, a non-linear amplifier behavior based on a non-linear model of a sub-amplifier parasitic using the determined sub-amplifier output signal as input to the model.
Claim 3
Dependent Claim
62 words
The linearization method according to claim 1 , wherein said emulating step includes the step of determining a compensation signal according to the non-linear model by applying the determined sub-amplifier output signal as input to the non-linear model; and said compensating step includes the step of merging the compensation signal into the sub-amplifier input signal to compensate for said non-linear amplifier behavior.
Claim 4
Dependent Claim
28 words
The linearization method according to claim 1 , wherein said step of determining a sub-amplifier output signal is based at least partly on an interaction between two sub-amplifiers.
Claim 5
Dependent Claim
20 words
The linearization method according to claim 3 , wherein said interaction is represented by a transimpedance between the two sub-amplifiers.
Claim 6
Dependent Claim
31 words
The linearization method according to claim 1 , wherein said non-linear amplifier behavior is the compression behavior due to amplifier saturation, said compression behavior being modeled as a non-linear sub-amplifier parasitic.
Claim 7
Dependent Claim
31 words
The linearization method according to claim 1 , wherein said steps of determining a sub-amplifier output signal and emulating and compensating for a non-linear amplifier behavior are performed for each sub-amplifier.
Claim 8
Dependent Claim
48 words
The linearization method according to claim 1 , wherein said method further comprises steps of emulating and compensating for, in the input signal to a main sub-amplifier, the non-linear output signal of an auxiliary sub-amplifier based on a linear model of the output network of the composite amplifier.
Claim 9
Dependent Claim
28 words
The linearization method according to claim 1 , wherein said method further comprises the steps of equalizing, for at least one of said sub-amplifiers, the amplifier frequency response.
Claim 10
Dependent Claim
75 words
A composite amplifier having at least two sub-amplifiers, wherein said composite amplifier comprises: for at least one sub-amplifier: means for determining a sub-amplifier output signal based on a linear model of the output network of the composite amplifier; means for emulating and compensating for, in the input signal to the sub-amplifier, a non-linear amplifier behavior based on a non-linear model of a sub-amplifier parasitic using the determined sub-amplifier output signal as input to the model.
Claim 11
Dependent Claim
75 words
A composite amplifier having at least two sub-amplifiers, wherein said composite amplifier comprises: for at least one sub-amplifier: means for determining a sub-amplifier output signal based on a linear model of the output network of the composite amplifier; means for emulating and compensating for, in the input signal to the sub-amplifier, a non-linear amplifier behavior based on a non-linear model of a sub-amplifier parasitic using the determined sub-amplifier output signal as input to the model.
Claim 12
Dependent Claim
61 words
The composite amplifier according to claim 9 , wherein said emulating means includes means for determining a compensation signal according to the non-linear model in response to the determined sub-amplifier output signal as input to the non-linear model; and said compensating means includes means for merging the compensation signal into the sub-amplifier input signal to compensate for said non-linear amplifier behavior.
Claim 13
Dependent Claim
28 words
The composite amplifier according to claim 9 , wherein said means for determining a sub-amplifier output signal is based at least partly on an interaction between two sub-amplifiers.
Claim 14
Dependent Claim
20 words
The composite amplifier according to claim 11 , wherein said interaction is represented by a transimpedance between the two sub-amplifiers.
Claim 15
Dependent Claim
49 words
The composite amplifier according to claim 9 , wherein said composite amplifier further comprises means for emulating and compensating for, in the input signal to a main sub-amplifier, the non-linear output signal of an auxiliary sub-amplifier based on a linear model of the output network of the composite amplifier.
Claim 16
Dependent Claim
28 words
The composite amplifier according to claim 9 , wherein said composite amplifier further comprises, for at least one of said sub-amplifiers, means for equalizing the amplifier frequency response.
Claim 17
Dependent Claim
81 words
A transmitter having a composite power amplifier based on at least two sub-amplifiers, wherein said composite power amplifier comprises: for at least one sub-amplifier: means for determining a sub-amplifier output signal based on a linear model of the output network of the composite amplifier; means for emulating and compensating for, in the input signal to the sub-amplifier, a non-linear amplifier behavior based on a non-linear model of a sub-amplifier parasitic using the determined sub-amplifier output signal as input to the model.
Claim 18
Dependent Claim
81 words
A transmitter having a composite power amplifier based on at least two sub-amplifiers, wherein said composite power amplifier comprises: for at least one sub-amplifier: means for determining a sub-amplifier output signal based on a linear model of the output network of the composite amplifier; means for emulating and compensating for, in the input signal to the sub-amplifier, a non-linear amplifier behavior based on a non-linear model of a sub-amplifier parasitic using the determined sub-amplifier output signal as input to the model.
Claim 19
Dependent Claim
60 words
The transmitter according to claim 15 , wherein said emulating means includes means for determining a compensation signal according to the non-linear model in response to the determined sub-amplifier output signal as input to the non-linear model; and said compensating means includes means for merging the compensation signal into the sub-amplifier input signal to compensate for said non-linear amplifier behavior.
Claim 20
Dependent Claim
32 words
The transmitter according to claim 15 , wherein said means for determining, for at least one sub-amplifier, a sub-amplifier output signal is based at least partly on an interaction between two sub-amplifiers.
Claim 21
Dependent Claim
19 words
The transmitter according to claim 17 , wherein said interaction is represented by a transimpedance between the two sub-amplifiers.
Claim 22
Dependent Claim
49 words
The transmitter according to claim 15 , wherein said composite power amplifier further comprises means for emulating and compensating for, in the input signal to a main sub-amplifier, the non-linear output signal of an auxiliary sub-amplifier based on a linear model of the output network of the composite amplifier.
Claim 23
Dependent Claim
28 words
The transmitter according to claim 15 , wherein said composite power amplifier further comprises means for equalizing, for at least one of said sub-amplifiers, the amplifier frequency response.
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