Title :
A 5-GHz Wireless LAN Transmitter with Integrated Tunable High-Q RF Filter
Author :
Wiser, Robert F. ; Zargari, Masoud ; Su, David K. ; Wooley, Bruce A.
Author_Institution :
Center for Integrated Syst., Stanford Univ., Stanford, CA, USA
Abstract :
A tunable, high-Q RF filter suitable for wireless transmitters has been implemented in a standard digital 0.18-mum CMOS technology. Active circuits are used to enhance the Q of two independent LC resonators, which are cascaded to form a wide bandwidth filter that can be tuned in both center frequency and bandwidth. A 5.145-GHz stagger-tuned filter with a 200-MHz bandwidth and 0.8 dB of ripple is demonstrated in an 802.11a sliding-IF transmitter. The transmitter provides spectral mask and EVM-compliant output power of -8.26 dBm for a 64-QAM OFDM signal. At lower output power, an EVM of -32.3 dB is achieved.
Keywords :
CMOS analogue integrated circuits; OFDM modulation; Q-factor; band-pass filters; programmable filters; quadrature amplitude modulation; radio transmitters; radiofrequency filters; resonator filters; wireless LAN; CMOS technology; LC resonators; QAM OFDM signal; bandpass filters; bandwidth 200 MHz; frequency 5 GHz; frequency 5.145 GHz; high-Q RF filter; integrated RF filter; resonator filters; size 0.18 mum; sliding-IF transmitter; spectral mask; stagger-tuned filter; tunable RF filter; tunable filters; wide bandwidth filter; wireless LAN transmitter; Bandwidth; CMOS technology; Digital filters; Integrated circuit technology; Power generation; Radio frequency; Resonator filters; Transmitters; Tunable circuits and devices; Wireless LAN; Bandpass filters; CMOS analog integrated circuits; programmable filters; radio transmitter; resonator filters; tunable filters; wireless LAN (WLAN);
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2009.2022920
