论文信息 - A novel linearizing technique using dual diode based linearizers for lightweight power amplifiers

A novel linearizing technique using dual diode based linearizers for lightweight power amplifiers

A novel way to compensate the distortion of power amplifier (PA) modules is presented in this paper. A diode linearizer with an inductor is used to compensate the distortion of the PA using LDMOS FET and has a characteristic of a positive phase and a gain expansion. Two diode-based linearizers are employed to compensate the distortions. One linearizer compensates the distortion of the phase, mainly. The other compensates the ones of the gain and the phase. It is possible to compensate the distortion of the PA module using this linearizing technique even though the driver stage of the PA module has the distortion. This implies that the PA modules can operate with high efficiencies. In addition, it is possible to achieve lightweight PA modules. A modulated spectrum power of 8 dB and an EVM of 1.4 % can be improved using the proposed techniques in the PA module when a 16-QAM modulated signal is used at a 42 dBm output power and a 3 dB back-off condition.

T. Kashiwa | Y. Ohnishi | K. Yamamoto | H. Ohshima

[1] Bumman Kim,et al. New predistortion linearizer using low-frequency even-order intermodulation components , 2002 .

[2] Youngwoo Kwon,et al. A new "active" predistorter with high gain and programmable gain and phase characteristics using cascode-FET structures , 2002 .

[3] Youngoo Yang,et al. Linearization of 1.85 GHz amplifier using feedback predistortion loop , 1998, 1998 IEEE MTT-S International Microwave Symposium Digest (Cat. No.98CH36192).

[4] M. Chongcheawchamnan,et al. A 900 MHz 16-QAM direct carrier modulation transmitter using feedforward linearization , 2000, 2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017).

[5] Naoto Kadowaki,et al. An 18 GHz-Band MMIC Diode Linearizer Using a Parallel Capacitor with a Bias Feed Resistance , 2003 .

[6] Sanjay Raman,et al. FET diode linearizer optimization for amplifier predistortion in digital radios , 2000 .

[7] F.M. Ghannouchi,et al. An L band adaptive digital predistorter for power amplifiers using direct I-Q modem , 1998, 1998 IEEE MTT-S International Microwave Symposium Digest (Cat. No.98CH36192).

[8] K. Yamauchi,et al. A microwave miniaturized linearizer using a parallel diode , 1997, 1997 IEEE MTT-S International Microwave Symposium Digest.

[9] Quan Xue,et al. A novel amplifier linearization technique using an anti-parallel reconfigurable transistor (ART) pair , 2004, 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535).