A passive mixer driving power amplifier device and nonlinear compensation method

Abstract

The invention relates to a passive mixer driving power amplifier device and a nonlinear compensation method. The passive mixer driving power amplifier device includes: an output terminal of a first digital-to-analog converter connected to an input terminal of a first low-pass filter , The output of the first low-pass filter is connected to the first input of the passive mixer; the output of the second digital-to-analog converter is connected to the input of the second low-pass filter, The output terminal is connected with the second input terminal of the passive mixer; the output terminal of the passive mixer is connected with the input terminal of the power amplifier; the compensation unit is used to compensate the baseband harmonic signals of the predetermined frequency, phase and amplitude Inject into the baseband signal; the passive mixer mixes the baseband signal containing the baseband harmonic compensation signal with the local oscillator signal to obtain a radio frequency signal; the radio frequency signal is amplified by the power amplifier and output.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a passive mixer driving power amplifier device and a nonlinear compensation method. Background technique [0002] In wireless transmitters, passive mixers have some advantages over active mixers. In theory, passive mixers do not consume DC power consumption. They work in the voltage domain and directly drive the power amplifier behind them, unlike conventional Inductive loads are required like source mixers. This avoids electromagnetic coupling between the mixer and the voltage controlled oscillator via passive loads. [0003] Passive mixers also have some disadvantages, notably poor isolation between the different ports, and a 25% duty cycle LO local oscillator clock signal is used to eliminate interaction between the I and Q signal paths. However, at the special moment when the switch of the mixer is turned on, there is basically no isolation between the radio frequenc...

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Problems solved by technology

[0003] Passive mixers also have some disadvantages, notably poor isolation between the different ports, and a 25% duty cycle LO local oscillator clock signal is used to eliminate the interaction of the I and Q signal paths

However, at the special moment when the switch of the mixer is turned on, there is basically no isolation between the radio frequency RF and the intermediate frequency IF

At this time, the analog circuit before the mixer must directly drive the input capacitor of a large power amplifier, and the voltage on the capacitor cannot completely follow the input baseband signal, which causes the amplitude of the signal to change with the I and Q changes of the baseband

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