A Low-Power Dual-Band Triple-Mode WLAN CMOS Transceiver

Abstract

This paper describes a 0.18- m CMOS direct-con- version dual-band triple-mode wireless LAN transceiver. The transceiver has a concurrent dual-band low-noise amplifier for low power consumption with a low noise figure, a single widely tunable low-pass filter based on a triode-biased MOSFET transconductor for multi-mode operation with low power con- sumption, a DC-offset compensation circuit with an adaptive activating feedback loop to achieve a fast response time with low power consumption, and a /6/1-based low-phase-noise frac- tional-N frequency synthesizer with a switched-resonator voltage controlled oscillator to cover the entire frequency range for the IEEE WLAN standards. The transceiver covers both 2.4–2.5 and 4.9–5.95 GHz and has extremely low power consumption (78 mA in receive mode, 76 mA in transmit mode—both at 2.4/5.2 GHz). A system noise figure of 3.5/4.2 dB, a sensitivity of 93/ 94 dBm for a 6-Mb/s OFDM signal, and an error vector magnitude of 3.2/3.4% were obtained at 2.4/5.2 GHz, respectively.