Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2006-01-10
2006-01-10
Nguyen, Patricia (Department: 2817)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C330S075000, C375S297000
Reexamination Certificate
active
06985033
ABSTRACT:
An amplifier with adjustable (pre)distortion, a predistortion adjustment circuit, systems and networks including such amplifiers and circuits, and methods for adjusting (pre)distortion in an analog amplifier. The amplifier architecture generally includes (a) a predistortion circuit configured to (i) select a value for a predistortion function from a plurality of different predistortion values, and (ii) apply the selected predistortion value to an input signal to generate a predistorted input signal; (b) an amplifier configured to amplify the predistorted input signal and provide an output signal therefrom; and (c) an adjustment circuit configured to adjust selection of the predistortion function value in response to a predetermined parameter value of the amplifier. By adjusting the predistortion function, the amplifier provides an output signal in a linear power range over a range of amplifier parameter values and avoids overcompensation that can occur when the predistortion signal is not adjustable. Furthermore, the adjustments are made in response to changes in amplifier input and/or control parameters, enabling the amplifier to stay in the linear range, rather than respond to changes that first cause the amplifier to fall out of linearity. The systems generally include the architecture, circuit or an integrated circuit that embodies one or more of the inventive concepts disclosed herein. The methods generally include the steps of (1) predistorting an input signal in accordance with a digital predistortion function to provide a predistorted signal, (2) adjusting the digital predistortion function in response to a predetermined parameter value of an amplifier, and (3) amplifying the predistorted signal with the amplifier to produce the amplified signal.
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“802.16 IEEE Standard for Local and Metropolitan Area Networks; Part 16: Air Interface for Fixed Broadband Wireless Access Systems,” 802.16 IEEE Standard for Local and Metropolitan Area Networks, Oct. 1, 2004, pp. i-xxxiv and pp. 1-857, IEEE Std 802.16-2004, IEEE, United States.
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Wayne A. Loeb et al.; U.S. Application No. 10/776,476; Filed on Feb. 10, 2004 (Attorney Docket No. MP0351); Circuits, Software and Methods, for Adjusting Power Amplifier Predistortion, and Power Amplifiers and Other Devices Including the Same.
Loeb Wayne
Shirali Kedar
Tsai King Chun
Marvell International Ltd.
Nguyen Patricia
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