CMOS power amplifier with high linearity

Abstract

The invention discloses a CMOS power amplifier with high linearity. The CMOS power amplifier comprises an amplifier unit and an envelope detection unit. The amplifier unit comprises one or more power transistors used for performing power amplification on input signals to obtain output signals. The envelope detection unit detects the input signals of the power transistors and generates envelope signals to serve as substrate bias voltages of the corresponding power transistors. According to the CMOS power amplifier disclosed by the invention, as the substrate voltages of the power transistors are adjusted by the envelope signals of the input signals of the power transistors, the linearity of the power amplifier can be effectively improved, and compared with the prior art of adjusting the grid voltages or supply voltages of the power transistors by adopting the envelope signals, the linearity is improved more effectively. The CMOS power amplifier further has a certain effect of improving the efficiency of the power amplifier.

Description

technical field [0001] The present application relates to a CMOS power amplifier, in particular to a substrate bias CMOS power amplifier. Background technique [0002] Designing power amplifiers using standard CMOS technology faces challenges in many performance indicators, and some solutions have been proposed to improve the linearity of CMOS power amplifiers. [0003] In December 2013, "IEEE TRANSACTIONS ON MICROWAVETHEORY AND TECHNIQUES" (IEEE TRANSACTIONS ON MICROWAVETHEORY AND TECHNIQUES) has an article "Linearity of CMOS Cascode Power Amplifiers by Adaptive Bias Control" "(Linearization of CMOS Cascode Power Amplifiers Through Adaptive Bias Control), this article records the linearization techniques of cascode power amplifiers using adaptive bias circuits, such as figure 1 shown. First, a common source amplifier M1 and a common gate amplifier M2 are cascaded to form a cascode amplifier, and then two cascode amplifiers form a differential structure, and then the envel...

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Problems solved by technology

However, this solution does not consider the influence of the common source transistors M1 and M3 of the driver stage and power stage on the nonlinearity, and the improvement of linearity is limited

And this solution can only be used for power amplifiers with multi-stage structure, which limits its scope of application

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