Transmitter and its base frequency processor and RF power amplifier modulating method

Abstract

The microwave transmitter of the present invention can perform two-terminal dynamic modulation with respect to the voltage supply terminal and the RF input terminal of a RF power amplifier. The microwave transmitter of the present invention comprises a first modulator and a second modulator. The first modulator uses the baseband digital delta-sigma modulation technique to process the envelope signal and outputs this signal to the voltage supply terminal of the RF power amplifier as a supply voltage. The second modulator uses the baseband digital pre-distortion technique to process the IQ-modulated carrier and outputs this signal to the RF input terminal of the RF power amplifier as a RF input signal. Thereby, the RF power amplifier can highly efficiently reconstruct the power-amplified RF modulated carrier without distortion at the RF output terminal. In addition, the baseband digital processing techniques used in the two modulators make the microwave transmitter of the present invention suitable for multi-mode operation.

Description

technical field [0001] The present invention relates to a transmitter, more specifically, the present invention relates to a microwave transmitter and its method which are applicable to various wireless communication system transmitter specifications and achieve multi-mode transmission function. Background technique [0002] In wireless communication handheld devices, the main DC power consumption comes from the RF power amplifier. Therefore, making the RF power amplifier not only have high linearity without distorting the amplified signal, but also have high efficiency to prolong the communication time has always been the research focus of RF power amplifier design. In particular, the Orthogonal Frequency Division Multiplexing (OFDM) digital modulation technology that will be widely used in future wireless communication systems has obvious time-varying wave packet characteristics, and its peak-to-average power ratio (PAPR) is much higher than that of existing wireless commu...

AI Technical Summary

Problems solved by technology

[0012] In view of the fact that the RF power amplifier used in traditional microwave transmitters needs to make a trade-off between linearity and efficiency, the advantages of using the EER transmitter architecture can take into account both high linearity and high efficiency, but its main disadvantages include accurate modulation Insufficient precision, pulse width modulator processing wave packet signal is easy to be distorted, fixed carrier input power will lead to dynamic operation efficiency drop and carrier leakage, etc. However, the improvement methods proposed so far cannot completely overcome these shortcomings

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