Patent US4462001A successfully refreshed from Google Patents.
US4462001A
Expired / Lapsed
US
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Baseband linearizer for wideband, high power, nonlinear amplifiers
Assignee: University of Ottawa
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Filing: 1982-02-22
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Granted: 1984-07-24
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Expires: 2002-02-22
Abstract
Abstract The baseband linearizer attenuates the amplitude of the in-phase and quadrature phase components of the baseband signal as a function of the transfer characteristic of the high power amplifier and under the control of a baseband signal power level detector. The phase angle of the attenuated signal is rotated as a function of the amplifier transfer characteristic, again under the control of the power level detector.
Inventors
- 👤 Henri Girard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:22
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3241; H03C; H03C3/00; H03C3/38; H03C3/40; H03C3/403; H04; H04B; H04B2201/00; H04B2201/69; H04B2201/707; H04B2201/70706
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
134 words
A baseband linearizer for a high power amplifier in a modulation transmission system wherein in-phase X and quadrature phase Y components of a baseband signal are filtered through low pass filters, comprising: first means for receiving the filtered in-phase X and quadrature phase Y components of the baseband signal and attenuating the amplitudes of the baseband signal X, Y components as a function of the high power amplifier transfer characteristics; second means for receiving the attenuated baseband signal X', Y' components and rotating the phase angle of the attenuated baseband signal X', Y' components as a function of the high power amplifier transfer characteristic, and means for detecting the power level of the filtered in-phase X and quadrature phase Y components of the baseband signal for controlling the first means and the second means.
Claim 2
Dependent Claim
134 words
A baseband linearizer for a high power amplifier in a modulation transmission system wherein in-phase X and quadrature phase Y components of a baseband signal are filtered through low pass filters, comprising: first means for receiving the filtered in-phase X and quadrature phase Y components of the baseband signal and attenuating the amplitudes of the baseband signal X, Y components as a function of the high power amplifier transfer characteristics; second means for receiving the attenuated baseband signal X', Y' components and rotating the phase angle of the attenuated baseband signal X', Y' components as a function of the high power amplifier transfer characteristic, and means for detecting the power level of the filtered in-phase X and quadrature phase Y components of the baseband signal for controlling the first means and the second means.
Claim 3
Dependent Claim
62 words
A baseband linearizer as claimed in claim 1 wherein the first means includes a first attenuator and a second attenuator for receiving and attenuating the amplitude in the in-phase X and quadrature Y components of the baseband signal, and first memory means for providing an attenuation factor to the first and second attenuators under the control of the power level detecting means.
Claim 4
Dependent Claim
86 words
A baseband linearizer as claimed in claim 2 wherein the second means includes a phase rotation circuit for rotating the phase of the attenuated baseband signal having an in-phase component X' and a quadrature phase component Y' to provide an output signal having an in-phase component X"=X' cos θ-Y' sin θ and a quadrature phase component Y"=Y' cos θ+X' sin θ where the rotation factor θ is provided to the phase rotation circuit by second memory means under the control of the power level detecting means.
Claim 5
Dependent Claim
122 words
A baseband linearizer as claimed in claim 3 wherein the phase rotation circuit includes a first multiplier and a second multiplier for receiving the in-phase component X' and signals cos θ and sin θ, respectively, from the memory means; a third multiplier and a fourth multiplier for receiving the quadrature component Y' and signals sin θ and cos θ, respectively, from the multiplier; first summing means for receiving the output from the first multiplier and an inverted output from the third multiplier to provide in-phase component X" of the predistorted baseband signal; and second summing means for receiving the output from the second multiplier and the output from the fourth multiplier to provide the quadrature component X" of the predistorted baseband signal.
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) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |