Title :
A wideband supply modulator for 20MHz RF bandwidth polar PAs in 65nm CMOS
Author :
Shrestha, R. ; Der Zee, R. A R Van ; de Graauw, A.J.M. ; Nauta, B.
Author_Institution :
Twente Univ., Enschede
Abstract :
A wideband modulator for a 20 MHz bandwidth polar modulated PA is presented which achieves a maximum efficiency of 87.5% and a small signal -3 dB bandwidth of 285 MHz. Realized in 65 nm CMOS, it consists of a cascoded nested Miller compensated linear amplifier and a class D switching amplifier. It can deliver 22.7 dBm output power to a 5.3 Omega load. With a switching frequency of 118 MHz, the output switching ripple is 4.3 mVrms.
Keywords :
CMOS analogue integrated circuits; power amplifiers; radiofrequency amplifiers; switching circuits; CMOS; Miller compensated linear amplifier; RF bandwidth polar PA; class D switching amplifier; frequency 118 MHz; frequency 20 MHz; frequency 285 MHz; resistance 5.3 ohm; size 65 nm; wideband supply modulator; Bandwidth; Broadband amplifiers; Capacitors; Low-noise amplifiers; Phase modulation; Power amplifiers; Radio frequency; Switching frequency; Transmitters; Wideband; CMOS and cascoded nested Miller; power amplifier; supply modulator;
Conference_Titel :
VLSI Circuits, 2008 IEEE Symposium on
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-1804-6
Electronic_ISBN :
978-1-4244-1805-3
DOI :
10.1109/VLSIC.2008.4585964
