Title :
A 1V 450μ W Quadrature Bandpass ΔΣ Modulator for the IEEE 802.15.4 Standard
Author :
Scolari, Nicola ; Enz, Christian
Author_Institution :
Lab. d´´Electronique Generate, Ecole Polytechnique Federate de Lausanne
Abstract :
This paper describes the design and implementation of a 2nd-order continuous-time quadrature bandpass ΔΣ modulator for wireless sensor networks (WSN) using the IEEE 802.15.4 standard. The design is focused on the constraints of low power consumption, low supply voltage and low complexity imposed by WSN. The availability of I and Q signals in the low-IF receiver enables a quadrature architecture which allows combining signal filtering, image rejection and quantization noise reduction. A continuous-time Gm-C implementation further combines the anti-alias function within the ADC and allows achieving the 1V operation. The quadrature ΔΣ modulator is integrated in a 0.18μm standard digital process. It is clocked at 72MHz and the center frequency is set at 3.75MHz with a bandwidth of 3MHz. The maximum measured signal-to-noise ratio is 36dB and the power consumption is only 450μW under 1V.
Keywords :
IEEE standards; delta-sigma modulation; filtering theory; low-power electronics; microwave receivers; wireless sensor networks; 0.18 micron; 1 V; 3 MHz; 3.75 MHz; 450 muW; 72 MHz; IEEE 802.15.4 standard; continuous-time Gm-C implementation; continuous-time delta-sigma modulator; image rejection; low complexity; low power consumption; low supply voltage; low-IF receiver; quadrature bandpass delta-sigma modulator; quantization noise reduction; signal filtering; standard digital process; wireless sensor networks; Clocks; Digital modulation; Energy consumption; Filtering; Frequency; Low voltage; Noise reduction; Power supplies; Quantization; Wireless sensor networks;
Conference_Titel :
Solid-State Circuits Conference, 2006. ESSCIRC 2006. Proceedings of the 32nd European
Conference_Location :
Montreux
Print_ISBN :
1-4244-0303-0
DOI :
10.1109/ESSCIR.2006.307563
