Title :
A 10MHz signal bandwidth Cartesian-loop transmitter capable of off-chip PA linearization
Author :
Ishihara, H. ; Hosoya, M. ; Otaka, S. ; Watanabe, Osamu
Abstract :
This paper presents a wide signal bandwidth Cartesian loop transmitter (CLT) for off-chip PA linearization. The CLT can linearize a 10 MHz bandwidth signal by using a feedforward technique to avoid instability caused by a time delay of an RF path. ACLR is improved from 30.2 dB to 38.4 dB and EVM is improved from 5.9% to 1.6% when a 10 MHz 64-QAM 802.16e signal is applied.
Keywords :
feedforward; linearisation techniques; metropolitan area networks; power amplifiers; quadrature amplitude modulation; 802.16e; QAM; feedforward technique; frequency 10 MHz; noise figure 30.2 dB to 38.4 dB; off-chip PA linearization; signal bandwidth Cartesian-loop transmitter; Bandwidth; Calibration; Circuits; Delay effects; Filters; Frequency response; Passband; RF signals; Radio frequency; Transmitters;
Conference_Titel :
Solid-State Circuits Conference Digest of Technical Papers (ISSCC), 2010 IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
978-1-4244-6033-5
DOI :
10.1109/ISSCC.2010.5434046
