Radio frequency power amplifier circuit

Abstract

The invention provides a radio frequency power amplifier circuit, belongs to the technical field of communication technology, and especially relates to a radio frequency power amplifier circuit. The invention provides a radio frequency power amplifier circuit which has a function of power control and improving gain expansion. The circuit comprises a power amplifier, a power control circuit, a linearizing bias circuit, and a bias boost circuit. The structure features are that the input port of the power amplifier is connected with the output port of the linearizing bias circuit, the output port of the bias boost circuit, the base electrode of a NPN audion HBT0. The emitting electrode of the HBT0 is connected with ground. The collector electrode of the HBT0 is connected with the output port of the power amplifier, the input port of the bias boost circuit, and one end of an inductor. The other end of the inductor is connected with a power supply Vcc. The input port of the linearizing bias circuit is connected with the output port of the power control circuit.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to a radio frequency power amplifier circuit. Background technique [0002] As the distance between the mobile device and the base station varies, the power of the signal transmitted by the power amplifier in the mobile device will also be adjusted accordingly during communication. Usually the output power of the power amplifier is in the range of medium and low power, and only a few suburbs far away from the base station can reach high output power. Therefore, under high and low output power, different bias currents can be used to significantly reduce the DC consumption in low power state, thereby improving the overall efficiency of the power amplifier and prolonging the service life of the battery. [0003] On the other hand, the peak-to-average ratio problem brought about by multi-carrier technology in modern wireless communication makes wireless transmitter designers face...

AI Technical Summary

Problems solved by technology

As the input signal increases, in addition to the gain compression of the power amplifier, due to the low bias current, there will often be a gain expansion region. Generally, in the high power region, moderate gain expansion will compensate for the gain compression, making the power amplifier 1dB compression point delay, thereby improving linearity, but for non-constant envelope modulation systems, the peak-to-average ratio brings higher linearity requirements, and the amplitude and phase distortion introduced by gain expansion can often not be ignored

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