Reducing the Third-Order Inter Modulation Distortion by Feed Forward Linearization of Power Amplifier

Abstract: Power amplifier determines the performance of a wireless communication system but it tends to be highly non-linear and results in intermodulation distortion at its output, thereby degrading the signal quality and causing adjacent channel interference. In this paper, feedforward linearization technique is used to reduce power amplifier non-linearity. The simulations are carried out using two-tone harmonic balance input at the frequencies of 2120 MHz and 2130 MHz. It is seen that this technique reduces the third-order intermodulation distortion levels to -68 dBm and the distance between fundamental component and third-order distortion component is 106 dBm.

Keywords: Feedforward, Intermodulation distortion (IMD), Linearization, Power Amplifier (PA).