A Low Power BAW Resonator Based 2.4-GHz Receiver With Bandwidth Tunable Channel Selection Filter at RF Aravind Heragu, Student Member , IEEE,D a v i d R u ffieux

Abstract

A low power sub-sampling multi-channel 2.4-GHz receiver front-end is presented. Bulk Acoustic Wave (BA W) resonators which intrinsically exhibit high quality factor ( Q)a r e exploited in the frequency synth esis to provide low phase noise signal with low power consumption. A low power solution to per- form channel selection and filtering directly at RF by employing current reuse and using a BA W resonator is proposed. The filter is capable of tuning the bandwidth and thus making the front-end to be suitable for multi-ba nd/multi-standard applications. The overall performance of the front-end is improved by additional discrete time filtering which also down-converts the wanted channel to baseband in quadrature. The proposed front-end is de- signed and integrated in a 0.18- µm CMOS process. Measurements reveal that the front-end is capable of providing very narrow band filtering down to 300 kHz. The rejection at 10-MHz offset is 62 dB with conversion gain of 44.2 dB.