Patent
Linear transmitter using predistortion
Charles Brian Cox,David K. Bonds,Jay Jui-Chieh Chen,Flaviu C. Costescu,Joel R. Dierks,Wayne D. Duello,Thomas L. Frederick,Paul A. Goud,Derek S. Hilborn,Richard Johnathan Hinkle,Terry L. Hinkle,David Jones,Theron L. Jones,Patricia F. Kavanagh,David W. Kroeger,Robert Leyendecker,Vladimir Pavlovic,Claudio G. Rey,Ray M. R. Sewlochan,Emre Tapucu,Mark Walker +20 more
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TLDR
In this article, a linear transmitter using predistortion includes a modulator (103), a predistorter (107), a digital quadrature modulator(111), an upconverter (113), a power amplifier (115), and an antenna (117).Abstract:
A linear transmitter (101) using predistortion includes a modulator (103), a predistorter (107), a digital quadrature modulator (111), an upconverter (113), a power amplifier (115), and an antenna (117). In addition, the transmitter (101) has a feedback loop including a coupler (119), a downconverter (123), a digital quadrature demodulator (125), and a trainer (131). The digital data to be transmitted is provided into the modulator (103), which converts the digital data into in-phase and quadrature component signals. The in-phase and quadrature component signals are then provided to the predistorter (107), which "predistorts" the component signals prior to amplification. The digital quadrature modulator (111) converts the component signals into a single analog signal. The upconverter (113) upconverts this signal from the predistorter (107) into the desired frequency of transmission, which is provided to the power amplifier (115) and the antenna (117) for amplification and broadcast. The coupler (119) provides a portion of the amplified signal to the analog downconverter (123), which lowers the frequency of this signal to a range that is easily processed. The signal is then provided to the digital quadrature demodulator (125), which outputs the in-phase and quadrature component signals of the signal. These in-phase and quadrature component signals are provided to the trainer (131) which analyzes them with the output signals from the modulator. The trainer (131) compares these signals and updates the predistorter (107) so that the digital quadrature demodulator (125) output signals are substantially equivalent to the modulator (103) output signals.read more
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References
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Linearized power amplifier
Michael Faulkner,M.A. Briffa +1 more
TL;DR: In this paper, a linearized power amplifier is provided which comprises a non-linear radio frequency (RF) power amplifier, a linearization circuit such as a Cartesian Feedback circuit, an RF feedback circuit; an IF feedback circuit, or a feedforward circuit, and a dynamic bias modulation circuit for modulating an operating voltage of the amplifier.
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