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A 5-GHz Wireless LAN Transmitter with Integrated Tunable High-Q RF Filter

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4 Author(s)
Wiser, R.F. ; Center for Integrated Syst., Stanford Univ., Stanford, CA, USA ; Zargari, M. ; Su, D.K. ; Wooley, B.A.

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.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:44 ,  Issue: 8 )