Broadband amplitude signal power supply modulator and modulation method thereof

Abstract

The invention provides a broadband amplitude signal power supply modulator and a modulation method thereof. The broadband amplitude signal power supply modulator comprises a basic clock generator and drive circuit, an amplitude signal generator, a pulse modulator and drive circuit, a switch amplifier, a rectifier and an on-off control circuit T, wherein the basic clock generator generates clock signals of which the duty ratio is 50% to drive a cascade system of the switch amplifier and the rectifier; the amplitude signal generator generates amplitude signals, the signals are modulated via the pulse modulator to realize presentation of the amplitude signal information on a node A after the connection and disconnection of the on-off control circuit T is controlled, so that loss-free amplification amplitude signals of the output end are achieved. As the switch amplifier and the rectifier both of the broadband amplitude signal power supply modulator work at a constant switching frequency, efficient conversion can be realized; the amplitude signals are modulated through changing the voltage state of the node A instead of changing the switching frequency or the duty ratio of switching signals, so the amplification of broadband amplitude signals can be realized.

Description

technical field [0001] The invention relates to a broadband amplitude signal power supply modulator and a modulation method thereof, which are mainly used in polar coordinate transmitters and belong to the technical field of radio frequency communication. Background technique [0002] In modern wireless communication systems, efficiency and linearity are always two key factors to measure the performance of the transmitter. As a new type of transmitter structure, the polar coordinate transmitter has attracted extensive attention because it can simultaneously achieve high linearity and high efficiency. The basic structure of a polar transmitter consists of a power modulator, a power amplifier and a phase modulation system. As one of the key parts of the polar transmitter, the linearity, efficiency and bandwidth of the power modulator will have a significant impact on the performance of the entire transmitter system. [0003] In polar transmitters, low dropout regulators and ...

AI Technical Summary

Problems solved by technology

The method of controlling the DC-DC converter by changing the switching frequency can achieve high-efficiency conversion when the switching frequency is low, but as the switching frequency increases, the power loss on the switching transistor will increase, which will lead to The efficiency becomes lower; the method of controlling the DC-DC converter by changing the duty cycle of the switching signal will decrease its efficiency when the load current is small

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