Title :
Novel analysis of the cancellation performance of a feedforward amplifier
Author :
Kang, Sanggee ; Jung, Youngjun ; Lee, Ilkyoo
Author_Institution :
Electron. & Telecommun. Res. Inst., Taejun, South Korea
Abstract :
The IMD (inter-modulation distortion) cancellation performance of a feedforward amplifier is determined by amplitude imbalance, phase imbalance and delay mismatch between two paths in a linearization loop. The effects of these parameters on the cancellation performance are analyzed. In this paper, we show that the linearization bandwidth and the IMD cancellation performance of a linearization loop depend more on the delay mismatch than on the other parameters. Additionally, the total effective IMD cancellation performance of a feedforward amplifier is investigated. The effects of the first linearization loop on the effective IMD cancellation performance are compared to those of the second linearization loop and then the influences of an error amplifier on the effective IMD cancellation performance are analyzed
Keywords :
feedforward; interference suppression; intermodulation distortion; linearisation techniques; power amplifiers; radio transmitters; radiofrequency amplifiers; IMD; amplitude imbalance; cancellation performance; delay mismatch; error amplifier; feedforward amplifier; first linearization loop; inter-modulation distortion; linearization bandwidth; linearization loop; phase imbalance; radio transmitter power amplifier; second linearization loop; Bandwidth; Delay effects; Delay lines; Digital modulation; High power amplifiers; Mobile communication; Nonlinear distortion; Performance analysis; Phase distortion; Radio transmitters;
Conference_Titel :
Global Telecommunications Conference, 1997. GLOBECOM '97., IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-4198-8
DOI :
10.1109/GLOCOM.1997.632515
