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A linearization technique for CMOS RF power amplifier with programmable output

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2 Author(s)
Zhao Liu ; Dept. of Electron. Eng., Tsinghua Univ., Beijing, China ; Huazhong Yang

A novel linearization technique for CMOS Class AB power amplifiers (PAs) is presented. The presented technique cancels third-order inter-modulation (IMD3) products of the output power which can be achieved by canceling the negative peak and the positive peak of second-order derivative of gm of the main transistor. Using auxiliary transistors in parallel can effectively flatten second-order derivative of gm while little power is consumed. A Class AB power amplifier incorporating this technique is designed at 433 MHz with programmable output power level. A two-tone test with frequency spacing of 1 MHz has been simulated and the reduction of the IMD3 is at least 10 dB.

Published in:

Communications, Circuits and Systems, 2009. ICCCAS 2009. International Conference on

Date of Conference:

23-25 July 2009