Amplifying apparatus
First Claim
1. An amplifying apparatus comprising:
- two amplifiers for receiving input signals in common and for outputting their respective amplified signals;
a combiner for combining the output signals of the two amplifiers and for outputting a combined signal;
a predistortion unit for determining a distortion compensation component based on the output signal of the combiner and for predistorting the input signal based on the determined distortion compensation component; and
a gain control unit for attenuating the input signals to set lower than in the steady state by reducing the gain lower than a steady value in the transition from the state where both of the amplifiers operate to the state where either of the amplifiers operates, or in the transition from the state where either of the amplifiers operates to the state where both of the amplifiers operate, or at the time of removal of either of the amplifiers, or at the time of attachment of the removed amplifier.
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Accused Products
Abstract
The present invention provides an amplifying apparatus including, two amplifiers for receiving input signals in common and for outputting their respective amplified signals, a combiner for combining the output signals of the two amplifiers and for outputting a combined signal, the amplifying apparatus which inhibit the distortion component in the output of amplifiers in the transition state. This amplifying apparatus comprises, a predistortion unit for determining a distortion compensation component based on the output of the combiner and for predistorting the input based on the determined distortion compensation component, and a gain control unit for attenuating the inputs to set lower than in the steady state by reducing the gain in the transition from two amplifier operation to one amplifier operation, or in the transition from one amplifier operation to two amplifier operation, or at the time of removal or attachment the amplifiers.
23 Citations
11 Claims
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1. An amplifying apparatus comprising:
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two amplifiers for receiving input signals in common and for outputting their respective amplified signals;
a combiner for combining the output signals of the two amplifiers and for outputting a combined signal;
a predistortion unit for determining a distortion compensation component based on the output signal of the combiner and for predistorting the input signal based on the determined distortion compensation component; and
a gain control unit for attenuating the input signals to set lower than in the steady state by reducing the gain lower than a steady value in the transition from the state where both of the amplifiers operate to the state where either of the amplifiers operates, or in the transition from the state where either of the amplifiers operates to the state where both of the amplifiers operate, or at the time of removal of either of the amplifiers, or at the time of attachment of the removed amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An amplifying apparatus comprising:
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two amplifiers for receiving input signals in common and for outputting their respective amplified signals;
a combiner for combining the output signals of the two amplifiers and for outputting a combined signal;
two predistortion units each for determining a distortion compensation component based on the output signal of the combiner, and for predistorting the input signal based on the determined distortion compensation component;
a switch unit for selecting one of output signals of the two predistortion units and for supplying the selected output signal to the two amplifiers in common; and
a gain control unit for attenuating the signals input to the two amplifiers to set lower than in the steady state by reducing the gain lower than a steady value when changing over the switch unit from one of the predistortion units to the other.
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11. An amplifying apparatus comprising:
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two amplifying units;
a combiner for combining output signals of the two amplifying units and for outputting a combined signal; and
a switch unit, each of the two amplifying units including;
a main amplifier;
a digital predistorter disposed at the input side of the main amplifier, and for generating a predictive distortion value of the main amplifier and for adding the generated predictive distortion value to input signals;
a quadrature modulator for quadrature-modulating an output signal of the digital predistorter;
an upconverter for converting the frequency of an output signal of the quadrature modulator;
a downconverter for converting the frequency of an output signal of the combiner and for imparting the frequency-converted output signal of the combiner to the digital predistorter; and
a gain control unit for receiving an output signal of the upconverter as input, and for attenuating the input signal to set lower than in the steady state by reducing the gain lower than a steady value in the transition from the state where both of the amplifying units operate to the state where either of the amplifying units operates, or in the transition from the state where either of the amplifying units operates to the state where both of the amplifying units operate, or at the time of removal of either of the amplifying units, or at the time of attachment of the removed amplifying unit, or at the time of changing over of the switch unit from one predistortion unit to the other predistortion unit, wherein the switch unit selects an output signal of one of the gain control units of the two transmission amplifying units and imparts the selected output signal to the main amplifiers in common.
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Specification