A Series Feedback Predistorter using Junction Resistance of Schottky Diode

Author

Kim, Ell-Kou ; Jeon, Ki-Kyung ; Kim, Young ; Yoon, Young-Chul

Author_Institution

Sch. of Electron. Eng., Kumoh Nat. Inst. of Technol., Gumi

fYear

2007

fDate

11-14 Dec. 2007

Firstpage

1

Lastpage

4

Abstract

This paper proposes a series feedback predistorter using junction resistance of schottky diode to compensate for AM/AM and AM/PM in the nonlinear characteristics of amplifier. This consists of common- emitter amplifier and schottky diode that is connected between emitter and ground. The common-emitter amplifier with varying resistance of schottky diode operates to increase amplitude and lead phase. To demonstrate the general usefulness of this predistorter, the series feedback predistorter was applied to linearize amplifier for cellular CDMA system. The test results show that IMD3 can be removed by more than lOdB in case of CW 2-tone signals. Also, the adjacent channel power ratio (ACPR) can be improved by more than 9.6dB for IS-95 CDMA 1FA signals.

Keywords

Schottky diodes; amplitude modulation; phase modulation; power amplifiers; Schottky diode; cellular CDMA system; common-emitter amplifier; junction resistance; series feedback predistorter; Equivalent circuits; Feedback; High power amplifiers; Multiaccess communication; Nonlinear distortion; Power amplifiers; Power engineering and energy; Radiofrequency amplifiers; Schottky diodes; Voltage; AM/AM; AM/PM; Predistorter; intermodulation distortion; power amplifier;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2007. APMC 2007. Asia-Pacific

Conference_Location

Bangkok

Print_ISBN

978-1-4244-0748-4

Electronic_ISBN

978-1-4244-0749-1

Type

conf

DOI

10.1109/APMC.2007.4555037

Filename

4555037