Abstract
This paper describes the design of a low cost, low-power ZigBee receiver for wireless sensor networks. The receiver consists of a low-noise amplifier, a pair of down-conversion mixers, and a pair of variable-gain low-pass filters. The LNA has a single-ended input, eliminating the need for an off-chip balun, a differential output, allowing it to drive a double-balanced mixer, and it uses noise cancellation to improve its noise performance. The mixers are double-balanced passive mixers to improve the receiver linearity and decrease its power consumption and flicker noise. Finally, the filter is a third-order Butterworth Gm–C filter with a variable input transconductor to provide gain programmability for the receiver. The design is made using 130nm CMOS technology with 1.2V supply. Simulation results show that the receiver can achieve a sensitivity level of −97dBm while consuming only 6mA.
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