Title :
Speed requirements of supply modulators used in polar architectures
Author :
Cabral, P.M. ; Rodrigues, F.A. ; Cabria, L. ; Garcia, J.A. ; Pedro, J.C.
Author_Institution :
Inst. de Telecomun., Univ. de Aveiro, Aveiro, Portugal
Abstract :
This paper investigates the minimum supply modulator linear processing bandwidth and slew rate (SR) requirements necessary to meet the standard specs of total signal distortion and adjacent signal power ratio in modern polar wireless transmitters. System level simulations, performed under CDMA2000FW and CDMA2000RV excitations, showed that, depending on the filter behavior in the amplitude envelope spectrum main lobe, relaxed bandwidths between 2 and 5 times the original signal are sufficient to guarantee desired specs of 45dB of ACPR and -35dB of NMSE. On what the SR is concerned, we concluded that 1/(2.5) times the maximum AM(t) signal slope is enough to achieve the same desired specs.
Keywords :
distortion; modulators; radio transmitters; signal processing; CDMA2000FW excitation; CDMA2000RV excitation; envelope spectrum main lobe; minimum supply modulator linear processing bandwidth; polar wireless transmitters; signal distortion; slew rate requirements; speed requirements; Amplitude modulation; Bandwidth; Filters; Linearity; Pulse modulation; Radio frequency; Samarium; Signal processing; Strontium; Transmitters; Bandwidth; Distortion; Envelope Elimination Restoration; Polar Transmitter; Slew Rate;
Conference_Titel :
Integrated Nonlinear Microwave and Millimeter-Wave Circuits (INMMIC), 2010 Workshop on
Conference_Location :
Goteborg
Print_ISBN :
978-1-4244-7410-3
Electronic_ISBN :
978-1-4244-7412-7
DOI :
10.1109/INMMIC.2010.5480136
