Modeling the Noise Shaping ADC for the nodes of Internet of Things
Journal Title: INTERNATIONAL JOURNAL OF COMPUTER SCIENCE AND EMERGING TECHNOLOGIES - Year 2017, Vol 1, Issue 1
Abstract
Sensors of internet of the things (IoT) benefits from reduced power of high-resolution analog-to-digital converters (ADC). Power reduction is required for its applications, operating from energy harvesting or battery power limited energy. A third-order multi-bit cascaded integrator with distributed feedforward (CIFF) delta-sigma modulator ADC will be investigated in this work to meet the challenges. The signal transfer function (STF) and noise transfer function (NTF) will be discussed for poles and zeroes. Modeling and simulation results will be provided to verify the achieved performance. Oversampling ratio (OSR) and different quantizer level would be presented for the modulator structure to trade-off the targeted bandwidth and complexity of increased quantizer level. NTF zeroes optimization techniques will also be implemented to reduce further in-band quantization noise by shaping at high frequency, which will be filtered by low-pass filter in the digital domain. Capacitor mismatch simulation will also be performed for the four-bit quantizer levels considering the performance degradation of the modulator. Operational amplifier (op-amp) for the front-end integrator will be optimized for minimum power consumption by considering non-ideal effect like low finite DC-gain, limited slew-rate, minimum required bandwidth, the proposed model simulations will be provided and discussed. Non-ideal effect for the proposed complete CIFF ADC structure for switched-capacitor circuit level implementation would be performed and parameter like thermal noise, op-amp noise, and switch non-linearity will be discussed for CIFF. Modeling, simulation results for CIFF structure with four-bit quantizer, will be showing that the proposed modulator structure can achieve signal-to-noise ratio (SNR) of 143dB for sensor system bandwidth of 20kHz with OSR = 128. Keywords—Internet of Things (IoT), Analog-to-digital converter
Authors and Affiliations
Arshad Hussain
Keywords
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