Title :
A dual-band high efficiency CMOS transmitter for wireless CDMA applications
Author :
Deng, Junxiong ; Chew, Mark ; Vora, Sameer ; Cassia, Marco ; Marra, Thomas ; Sahota, Kamal ; Aparin, Vladimir
Author_Institution :
Qualcomm Inc., San Diego
Abstract :
A dual-band transmitter integrated circuit (TxIC), including baseband filter and variable gain amplifier (VGA), upconverter, RF VGA, driver amplifier (DA), is implemented in 0.18 mum CMOS for CDMA applications. The TxIC increases the handset talk time dramatically with the PA-bypass feature. The chip provides more than a total power control range of 80 dB and a fine gain step of 0.25 dB/LSB. The chip achieves 52.3 dBc ACPR at +7 dBm output power with 52.2 mA and 51.7 dBc ACPR at +7 dBm output power with 51.9 mA for low band and high band applications respectively.
Keywords :
CMOS integrated circuits; code division multiple access; radio transmitters; CMOS transmitter; code division multiple access; dual-band transmitter integrated circuit; size 0.18 mum; wireless CDMA application; Application specific integrated circuits; Baseband; CMOS integrated circuits; Dual band; Filters; Multiaccess communication; Power generation; Radiofrequency amplifiers; Radiofrequency integrated circuits; Transmitters; CDMA; CMOS; efficiency; integrated circuit; transmitter;
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 2007 IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
1-4244-0530-0
Electronic_ISBN :
1529-2517
DOI :
10.1109/RFIC.2007.380825
