| 摘要 |
Disclosed is a digital signal processing portion that amplifies a high frequency signal resulting from digitally modulating data to be transmitted. An envelope detection portion (DETenv) generates the high frequency signal's envelope voltage. A comparator compares this envelope voltage with reference voltage Vref to generate two-state output. According to this two-state output, a power converter circuit converts power supply voltage Vbatt into power and outputs power supply voltage Vpa for a power amplifier. While the envelope voltage is larger than the reference voltage Vref, for example, the power supply voltage Vpa is changed from voltage V 1 to V 2 (larger than V 1 ). In this manner, there are provided a high frequency power amplifier and a transmitter capable of decreasing distortion of transmission signals by means of a relatively simple technique.
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