A direct conversion WiMAX RF transmitter in 0.18um CMOS technology

Author

Hanif, M.F. ; Askari, S. ; Desai, K. ; Banerjee, B. ; Nourani, M.

Author_Institution

Univ. of Texas at Dallas, Richardson, TX, USA

fYear

2009

fDate

4-5 Oct. 2009

Firstpage

1

Lastpage

4

Abstract

This paper describes a direct conversion transmitter for front-end Mobile WiMAX. The transmitter is implemented in 0.18μm CMOS technology and covers the frequency range 2.5-2.7 GHz. The components included in the system are Phase locked loop (PLL), phase frequency detector (PFD), Charge Pump (CP), TSPC based clock divider and Voltage Controlled Oscillator (VCO). On chip CMOS Class-AB Power Amplifier (PA) with adaptive biasing and highly linear active Mixer are also implemented. The transmitter employs fully differential architecture for VCO providing excellent rejection of substrate Noise. The PA has OIP3 in excess of 18 dBm providing EVM <; 3% with 16 QAM modulation scheme and an excellent spectral mask adherence.

Keywords

CMOS integrated circuits; WiMax; charge pump circuits; clocks; mixers (circuits); mobile communication; oscillators; phase locked loops; power amplifiers; transmitters; voltage control; CMOS technology; PFD; PLL; TSPC based clock divider; VCO; adaptive biasing; charge pump; direct conversion WiMAX RF transmitter; direct conversion transmitter; frequency 2.5 GHz to 2.7 GHz; front-end mobile WiMAX; highly linear active mixer; on chip CMOS class-AB power amplifier; phase frequency detector; phase locked loop; size 0.18 mum; substrate noise; voltage controlled oscillator; CMOS technology; Charge pumps; Clocks; High power amplifiers; Phase frequency detector; Phase locked loops; Radio frequency; Transmitters; Voltage-controlled oscillators; WiMAX; CP and direct conversion architecture; Class AB power amplifier; Mobile WiMAX; PFD; mixer; voltage control oscillator;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems Workshop,(DCAS), 2009 IEEE Dallas

Conference_Location

Richardson, TX

Print_ISBN

978-1-4244-5483-9

Electronic_ISBN

978-1-4244-5484-6

Type

conf

DOI

10.1109/DCAS.2009.5505724

Filename

5505724