Broadband Analog Predistortion Circuits Utilizing Derivative Superposition

In this paper, we present two different broadband derivative superposition (DS) circuits for linearizing mm Wave integrated circuits and small power amplifiers implemented using 22nm CMOS SOI technology. By combining two parallel devices with different biasing different nonlinear characteristics can be provided. Measured results showed more than 30 dB IM3 improvement for conventional DS circuit values by utilizing back-gate voltage on an auxiliary amplifier. Above 3 dB gain expansion was measured by a complementary DS circuit, which uses parallel NMOS and PMOS devices. This offers a simple analog predistortion circuit for an integrated small power amplifier, for example.