Title :
An L-band Direct-Digital QPSK Modulator in CMOS
Author :
El-Gabaly, Ahmed M. ; Jackson, Brad R. ; Saavedra, Carlos E.
Author_Institution :
Queen´´s Univ., Kingston
fDate :
July 30 2007-Aug. 2 2007
Abstract :
A new direct-digital quadrature phase shift keying (QPSK) modulator is proposed for portable wireless applications. Its compact yet effective design includes passive phase shifters, active baluns and pass transistors for low-power operation. The integrated circuit (IC) has been implemented in a low-cost 0.18 um complimentary metal-oxide semiconductor (CMOS) process with a 1.8 V supply. Experimental results at 1.7 GHz show solid performance with the data transmission rate and carrier rejection exceeding 20 Mbps and 40 dB respectively.
Keywords :
CMOS integrated circuits; UHF integrated circuits; modulators; quadrature phase shift keying; radiocommunication; CMOS; L-band direct-digital QPSK modulator; active baluns; complimentary metal-oxide semiconductor process; frequency 1.7 GHz; integrated circuit; pass transistor; passive phase shifter; portable wireless application; quadrature phase shift keying; size 0.18 mum; voltage 1.8 V; CMOS integrated circuits; CMOS process; Data communication; Impedance matching; L-band; MOS devices; Phase modulation; Phase shifters; Quadrature phase shift keying; Solids; CMOS integrated circuits; Digital modulation; portable radio communication; quadrature phase shift keying;
Conference_Titel :
Signals, Systems and Electronics, 2007. ISSSE '07. International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
1-4244-1448-2
Electronic_ISBN :
1-4244-1449-0
DOI :
10.1109/ISSSE.2007.4294538
