Predistorter
First Claim
1. A predistorter for compensating for a distortion generated at an amplifier by inputting a signal to be inputted to the amplifier constituting an object of compensating for the distortion and previously providing the distortion to the input signal, said predistorter comprising:
- amplifier replica means having an input/output characteristic the same as an input/output characteristic of the amplifier or an input/output characteristic approximated thereto for inputting a signal to output;
difference detecting means for detecting a difference between an input signal to the predistorter and an output signal from the amplifier replica means;
amplifier replica input signal changing means for changing the signal inputted to the amplifier replica such that a difference detected by the difference detecting means is reduced; and
change signal outputting means for outputting the signal changed by the amplifier replica input signal changing means to the amplifier.
1 Assignment
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Accused Products
Abstract
To provide a predistorter compensating for distortion generated at an amplifier by inputting a signal to be inputted to the amplifier constituting an object of compensating for the distortion and previously providing the distortion to the input signal. Amplifier replica means is provided with an input/output characteristic the same as an input/output characteristic of an amplifier or an input/output characteristic approximated thereto and inputs a signal to output. Difference detecting means detects a difference between an input signal to a predistorter and an output signal from the amplifier replica means. Amplifier replica input signal changing means changes a signal inputted to the amplifier replica means such that the difference detected by the difference detecting means is reduced. Change signal outputting means outputs a signal changed by the amplifier replica input signal changing means to the amplifier.
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Citations
14 Claims
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1. A predistorter for compensating for a distortion generated at an amplifier by inputting a signal to be inputted to the amplifier constituting an object of compensating for the distortion and previously providing the distortion to the input signal, said predistorter comprising:
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amplifier replica means having an input/output characteristic the same as an input/output characteristic of the amplifier or an input/output characteristic approximated thereto for inputting a signal to output;
difference detecting means for detecting a difference between an input signal to the predistorter and an output signal from the amplifier replica means;
amplifier replica input signal changing means for changing the signal inputted to the amplifier replica such that a difference detected by the difference detecting means is reduced; and
change signal outputting means for outputting the signal changed by the amplifier replica input signal changing means to the amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification