Title :
A 2W CMOS Hybrid Switching Amplitude Modulator for EDGE Polar Transmitters
Author :
Kwak, Tae-Woo ; Lee, Min-Chul ; Choi, Bae-Kun ; Le, Hanh-Phuc ; Cho, Gyu-Hyeong
Author_Institution :
KAIST, Daejeon
Abstract :
An amplitude modulator for class-E2 EDGE polar transmitters is fabricated in a 0.35mum CMOS process. This hybrid switching modulator consists of a class-D amplifier with a 2MHz switching frequency and a wideband buffered analog amplifier having low output impedance of 200mOmega at high frequency. It can drive an RF PA with an equivalent impedance of 4Omega up to maximum output power of 2.25W with a maximum efficiency of 88.3%. The chip area is 4.7mm2.
Keywords :
CMOS integrated circuits; amplifiers; modulators; transmitters; 0.35 micron; 2 MHz; 2 W; 2.25 W; 200 mohm; 4 ohm; CMOS hybrid switching; amplitude modulator; class-D amplifier; class-E2 EDGE polar transmitters; equivalent impedance; hybrid switching modulator; wideband buffered analog amplifier; Amplitude modulation; Broadband amplifiers; CMOS process; Impedance; Power amplifiers; Power generation; Radio frequency; Radiofrequency amplifiers; Switching frequency; Transmitters;
Conference_Titel :
Solid-State Circuits Conference, 2007. ISSCC 2007. Digest of Technical Papers. IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
1-4244-0853-9
Electronic_ISBN :
0193-6530
DOI :
10.1109/ISSCC.2007.373522
