Power amplifier with variable power supply voltage

Abstract

Disclosed is a circuit structure including a power amplifier and a temperature-dependent power supply system for the power amplifier. The power supply system includes a first voltage generator, which generates a reference voltage that is variable and depends on the operating temperature. In some embodiments, this first voltage generator employs a combination of proportional-to-absolute-temperature and constant-to-absolute temperature current sources to achieve the desired relationship between the operating temperature and the reference voltage. In other embodiments, a look-up table is employed to achieve the desired relationship between the operating temperature and the reference voltage. In any case, the power supply system also includes a second voltage generator, which is connected to receive the reference voltage and which generates (and outputs to the power amplifier) a power supply voltage that is dependent on the reference voltage.

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