Transmitting apparatus and radio communication apparatus
First Claim
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1. A transmitting apparatus comprising:
- a transmission power amplification section that has a high-frequency power amplifier that performs power amplification of transmit signal to output that signal; and
a compensation section that performs compensation of average output power of said high-frequency power amplification section;
wherein said transmission power amplification section has a first mode in which said high-frequency power amplifier is operated as a nonlinear amplifier and amplitude modulation and average output level control of said transmit signal are performed based on a power supply voltage of said high-frequency power amplifier, and a second mode in which said high-frequency power amplifier is operated as a linear amplifier and amplitude modulation and average output level control of said transmit signal are performed in a stage prior to said high-frequency power amplifier; and
said compensation section has a compensation table that stores compensation value information for compensating said average output level, and compensates said average output level based on said compensation value information stored in said compensation table.
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Abstract
A transmitting apparatus 100 operates a high-frequency power amplifier 105 as a nonlinear amplifier in a first mode, and operates high-frequency power amplifier 105 as a linear amplifier in a second mode. When high-frequency power amplifier 105 is operated as a nonlinear amplifier, the input level of high-frequency power amplifier 105 is varied by a variable gain amplifier 107 in accordance with the average output power of a transmit signal. Transmitting apparatus 100 is also provided with a compensation table 121 for reducing error in high-frequency power amplifier 105 mode switching operations.
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Citations
8 Claims
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1. A transmitting apparatus comprising:
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a transmission power amplification section that has a high-frequency power amplifier that performs power amplification of transmit signal to output that signal; and
a compensation section that performs compensation of average output power of said high-frequency power amplification section;
whereinsaid transmission power amplification section has a first mode in which said high-frequency power amplifier is operated as a nonlinear amplifier and amplitude modulation and average output level control of said transmit signal are performed based on a power supply voltage of said high-frequency power amplifier, and a second mode in which said high-frequency power amplifier is operated as a linear amplifier and amplitude modulation and average output level control of said transmit signal are performed in a stage prior to said high-frequency power amplifier; and
said compensation section has a compensation table that stores compensation value information for compensating said average output level, and compensates said average output level based on said compensation value information stored in said compensation table. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification