Radio-frequency CASCODE structure power amplifier with improved linearity and power added efficiency

Abstract

The invention disclose a radio-frequency Cascode structure power amplifier with improved linearity and power added efficiency, comprising a Cascode structure comprising a common-emitter input transistor and a common-base output transistor, an input matching network connected from a signal input port of the power amplifier and a base of the input transistor, and an output matching network connected from a collector of the output transistor to the signal output port of the power amplifier. The base of the output transistor is connected with an RLC series-parallel resonant network capable of improving the gain of a baseband signal and restraining input of a secondary harmonic signal. The radio-frequency Cascode structure power amplifier obviously improves the linearity and power added efficiency of the CASCODE structure power amplifier without increasing the static power consumption of the power amplifier by means of increasing the baseband gain and restraining the harmonic signal by the RLC series-parallel resonant network; and the radio-frequency Cascode structure power amplifier effectively increases the gain bandwidth product of the Cascode structure wideband power amplifier.

Description

technical field [0001] The invention relates to a radio frequency Cascode (cascode) structure power amplifier with high linearity and high power added efficiency, which belongs to the technical field of radio frequency integrated circuits. Background technique [0002] A typical wireless transmitting device uses a radio frequency (RF) power amplifier to amplify the signal transmitted through the antenna. It amplifies the modulated frequency band signal to the required power. In order to ensure that the receiver in the coverage area can receive a satisfactory signal level, but not interfere too much with the adjacent channel communication, it is necessary to improve the linearity of the power amplifier as much as possible. At the same time, in order to improve the energy utilization rate of the transmission system and reduce the volume of communication equipment, it is also necessary to use high-efficiency power amplifiers. However, the signal of a high-efficiency power ampl...

AI Technical Summary

Problems solved by technology

The predistortion method has a simple circuit, high operating frequency, and unconditional stability. It is suitable for any modulation signal and is an ideal linearization technology, but it often increases the complexity of the circuit.

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