Title :
A varactor diode based predistortion circuit
Author :
Gupta, Navin ; Tombak, Ali ; Mortazawi, Amir
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., USA
Abstract :
Operation and performance of a varactor diode based linearizer is investigated. This novel predistortion topology employs a series resonant circuit with a reverse biased varactor diode acting as a power dependant capacitor. The linearizer itself is both simulated and tested to display its nonlinear properties. In addition, a 1.8 GHz power amplifier is linearized based on this technique. An improvement of 11 dB in ACPR and an increase in 1.8 dB for the compression point is measured for the linearized PA.
Keywords :
distortion; linearisation techniques; power amplifiers; power capacitors; varactors; 1.8 GHz; 1.8 dB; 11 dB; adjacent channel power ratio; compression point; linearized power amplifier; nonlinear properties; power dependant capacitor; predistortion circuit; reverse biased varactor diode; series resonant circuit; Circuit simulation; Circuit testing; Circuit topology; Diodes; Displays; Power amplifiers; Power capacitors; Predistortion; RLC circuits; Varactors;
Conference_Titel :
Microwave Symposium Digest, 2004 IEEE MTT-S International
Print_ISBN :
0-7803-8331-1
DOI :
10.1109/MWSYM.2004.1336082
