US6002300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for the linearization of an amplifier circuit
Assignee: Nokia Solutions and Networks GmbH and Co KG
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Filing: 1998-08-21
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Granted: 1999-12-14
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Expires: 2018-08-21
Abstract
Abstract A control system for the linearization of an amplifier circuit having a power amplifier operating in the non-linear region for the amplification of an RF input signal. In a modulator a local oscillator is derived from a coupled-out input measurement signal. In a mixer, the local oscillator signal is mixed with the input and output measurement signal to form a respective intermediate-frequency signal. In a detector, level signals are derived from the intermediate-frequency signal and are compared in an amplitude controller. A derived amplitude control signal controls an amplitude controlling element for the linearization of the amplification of the input signal.
Inventors
- 👤 Guenther Herbster
- 👤 Friedrich Schumacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:24
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042; H03F; H03F1/00; H03F1/32; H03F1/3241; H03F1/3247; H03F1/3282; H03F1/34; H03F3/00; H03F3/20; H03F3/24; H04; H04B; H04B1/00; H04B1/02; H04B1/04; H04B2001/0408; H04B2001/0433
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
187 words
A control system for the linearization of an amplifier circuit having a power amplifier for the production of an RF output signal from an RF input signal, the system comprising: a modulator for deriving a first local oscillator signal from an input measurement signal coupled out from the input signal via an input directional coupler; an input mixer for mixing the input measurement signal with the first local oscillator signal to form an input intermediate-frequency signal; an input detector for deriving an input level signal from the input intermediate-frequency signal; an output mixer for mixing an output measurement signal with the first local oscillator signal to form an output intermediate-frequency signal, wherein the output measurement signal is coupled out from the output signal via an output directional coupler; an output detector for deriving an output level signal from the output intermediate-frequency signal; at least one amplitude controller for deriving an amplitude control signal by comparing the input level signal with the output level signal; and at least one amplitude controlling element, controlled by the amplitude control signal, for the linearization of the amplification of the input signal.
Claim 2
Dependent Claim
187 words
A control system for the linearization of an amplifier circuit having a power amplifier for the production of an RF output signal from an RF input signal, the system comprising: a modulator for deriving a first local oscillator signal from an input measurement signal coupled out from the input signal via an input directional coupler; an input mixer for mixing the input measurement signal with the first local oscillator signal to form an input intermediate-frequency signal; an input detector for deriving an input level signal from the input intermediate-frequency signal; an output mixer for mixing an output measurement signal with the first local oscillator signal to form an output intermediate-frequency signal, wherein the output measurement signal is coupled out from the output signal via an output directional coupler; an output detector for deriving an output level signal from the output intermediate-frequency signal; at least one amplitude controller for deriving an amplitude control signal by comparing the input level signal with the output level signal; and at least one amplitude controlling element, controlled by the amplitude control signal, for the linearization of the amplification of the input signal.
Claim 3
Dependent Claim
82 words
A control system as claimed in claim 1, further comprising: at least one phase controller for deriving a phase control signal by comparing a phase angle of an input phase signal, derived in the input detector from the input intermediate-frequency signal, with a phase angle of an output phase signal derived in the output detector from the output intermediate-frequency signal; and at least one phase controlling element, controlled by the phase control signal, for controlling the phase angle of the input signal.
Claim 4
Dependent Claim
25 words
A control system as claimed in claim 1, further comprising: an amplification adjustment section for producing an amplification adjustment signal from the output measurement signal.
Claim 5
Dependent Claim
26 words
A control system as claimed in claim 1, further comprising: a loop filter connected after the amplitude controller for the filtering of the amplitude control signal.
Claim 6
Dependent Claim
26 words
A control system as claimed in claim 1, further comprising: a loop filter connected after the phase controller for the filtering of the phase control signal.
Claim 7
Dependent Claim
26 words
A control system as claimed in claim 1, further comprising: a band-pass filter connected after the input mixer for the filtering of the input intermediate-frequency signal.
Claim 8
Dependent Claim
26 words
A control system as claimed in claim 1, further comprising: a band-pass filter connected after the output mixer for the filtering of the output intermediate-frequency signal.
Claim 9
Dependent Claim
91 words
A control system as claimed in claim 1, further comprising: an additional input detector for detecting the input intermediate-frequency signal and an additional output detector for detecting the output intermediate-frequency signal, wherein the input detector and the output detect are realized as a logarithmic detector, and the additional input detector and the additional output detector are realized as a diode detector; and a respective combination section for combining the input level signal and the output level signal with the output signals of the additional input detector and the additional output detector.
Claim 10
Dependent Claim
63 words
A control system as claimed in claim 1, wherein the modulator for a double-sideband modulation further comprises: a mixer for mixing a local oscillator signal, produced in a local oscillator, with the input measurement signal to form an auxiliary signal; and a limiter for limiting a filter for removing mirror components of the auxiliary signal and for producing the first local oscillator signal.
Claim 11
Dependent Claim
111 words
A control system as claimed in claim 1, wherein the modulator for a single-sideband modulation further comprises: a power divider for deriving a first auxiliary signal from the input measurement signal; a first mixer for the in-phase mixing of a local oscillator signal, produced in a local oscillator, with the first auxiliary signal to form a second auxiliary signal; a second mixer for the phase-displaced mixing of the local oscillator signal, produced in the local oscillator and phase-displaced by a phase shifter, with the first auxiliary signal to form a third auxiliary signal; and a hybrid for combining the second and third auxiliary signals to form the first local oscillator signal.
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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) | 2002-12-13 | 2003-06-14 | 2003-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-13 | 2007-06-14 | 2007-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-13 | 2011-06-14 | 2011-12-14 | $7700.00 | Window Closed / Lapsed |