US 5,164,678 A · Process for compensating nonlinearities in an amplifier circuit

Abstract

A process for compensating nonlinearities in an amplifier circuit. An input signal s(t) is amplified to form an output signal y(t) using an amplifier circuit subject to nonlinearities. In accordance with the invention, a predistortion filter is connected upstream of the amplifier circuit. An aggregate signal ##EQU1## is formed in said filter from the input signal s(t) and a predistorted signal x(t) fed back from the output of the predistortion filter, and integrated with respect to time. The predistorted signal x(t) is fed to the amplifier circuit subject to nonlinearities. In this case, the prescribed number n+1 of coefficients k.sub.0, . . . , K.sub.n is determined in accordance with the model ##EQU2## so that for a given input signal x(t) of the amplifier circuit the output signal determined in accordance with the model is essentially identical with the output signal y(t) of the amplifier circuit.

Claims10

Dependent claims

A process for compensating nonlinearities in an amplifier circuit, in which an input audio signal s(t) is amplified to form an output audio signal y(t) using a prescribed amplifier circuit subject to nonlinearities, comprising:

determining a prescribed number n+1 of coefficients k.sub.0, . . . , k.sub.n of the amplifier circuit in accordance with the model ##EQU26## so that for a given input signal x(t) of the amplifier circuit the output signal determined in accordance with the model is essentially identical with the actual output signal y(t) of the amplifier circuit,
producing an aggregate signal ##EQU27## in a predistortion filter from the input signal s(t), integrating the aggregate signal with respect to time in an integrator to form a predistorted signal x(t), and
feeding back a predistorted signal x(t) fed back to the predistortion filter, and
feeding a predistorted signal from the output of the predistortion filter x(t) to the amplifier circuit subject to nonlinearities.

1 more element

A process for compensating nonlinearities in an amplifier circuit, in which an input audio signal s(t) is amplified to form an output audio signal y(t) using an amplifier circuit subject to nonlinearities, comprising:

determining a prescribed number n+1 of coefficients k.sub.0, . . . , k.sub.n of the amplifier circuit in accordance with the model ##EQU28## so that for a given input signal x(t) of the amplifier circuit the output signal determined in accordance with the model is essentially identical with the actual output signal y(t) of the amplifier circuit,
obtaining a compensation signal c(j) in a predistortion filter from the digitized input signal s(j) in accordance with ##EQU29## adding the compensation signal to the input signal, and feeding the resulting signal x(t) to the amplifier circuit subject to nonlinearities.

Dependencies are inferred from the claim text.

Process for compensating nonlinearities in an amplifier circuit

Life of this patent

Process for compensating nonlinearities in an amplifier circuit

Life of this patent

Abstract

Claims10