Title :
Second harmonic zone injection for amplifier linearisation
Author :
Nesimoglu, Tayfun ; Wilkinson, Ross J. ; Canagarajah, C.N. ; McGeehan, J.P.
Author_Institution :
Centre for Commun. Res., Bristol Univ., UK
Abstract :
Second harmonic zone (SHZ) injection is a feedback technique for reducing the intermodulation distortion (IMD) at the output of an amplifier, which is based on feeding the SHZ intermodulation products (IMP), back to the amplifier´s input. The technique is analyzed theoretically and practical results demonstrate the linearisation performance. Two feedback prototypes were built, one using a frequency doubler and the other using a buffer amplifier as a distorter, where 14 dB and 13 dB improvement was obtained respectively in reducing the third order IMP (IMP3). The performance of the technique with changing frequency and input power level was also investigated
Keywords :
buffer circuits; feedback amplifiers; frequency multipliers; harmonic analysis; intermodulation distortion; land mobile radio; linearisation techniques; power amplifiers; radio transmitters; radiofrequency amplifiers; RF power amplifier; amplifier input; amplifier linearisation; amplifier output; buffer amplifier; distorter; feedback prototypes; feedback technique; frequency doubler; input power level; intermodulation distortion reduction; intermodulation products; linear transmitter; linearisation performance; mobile communication systems; second harmonic zone injection; spectral efficiency; third order IMP reduction; wireless communication systems; Bandwidth; Circuits; Crosstalk; Distortion; Feedback; Frequency; Power amplifiers; Prototypes; Signal generators; Signal to noise ratio;
Conference_Titel :
Vehicular Technology Conference, 1999 IEEE 49th
Conference_Location :
Houston, TX
Print_ISBN :
0-7803-5565-2
DOI :
10.1109/VETEC.1999.778491
