Variable gain active predistorter with linearity enhancement for a 2.4 GHz SiGe HBT power amplifier design. - Kuei-Cheng Lin; Hwann-Kaeo Chiou; Po-Chang Wu; Chu-Jung Sha; Chun-Lin Ko; Da-Chiang Chang; Ying-Zong Juang (VLSI-DAT, 2012)