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Energy Metering Applies to the 16 ΣΔ Modulator

Author: LuYan
Tutor: WuYuGuang
School: Xi'an University of Electronic Science and Technology
Course: Microelectronics and Solid State Electronics
Keywords: Sigma delta modulator Oversampling Noise shaping Switched-capacitor integrator Switched capacitor common mode feedback
CLC: TM933.4
Type: Master's thesis
Year: 2009
Downloads: 81
Quote: 0
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Abstract


This article based on SMIC0.35μmCMOS process , the use of integrated circuits EDA design and simulation tools , design a mainly used in energy metering 16-bit sigma delta modulator , the modulator uses a single 5V supply , the sampling frequency to 900kHz sampling rate 256 , the input signal bandwidth of 1.7 kHz , the feedforward second - order single-bit structure , circuit mainly by the fully differential switched capacitor to achieve . The design is based mainly on the basis of the the Matlab system-level simulation , simulation of the circuit -level design using Spectre tools . The design of the main circuit module : reference circuit , the input buffer , switched-capacitor integrator , op amp and comparator . In the reference circuit , the reference current temperature coefficient of 37ppm / ° C , the temperature coefficient of the reference voltage is 2.7ppm / ° C ; input buffers in order to allow a bipolar signal into the modulator by a single power supply design ; Switched Capacitor the integrator is not related to the parasitic capacitance in-phase switch capacitor integrator is the structure , which transported put folded common - source total gate structure , using a switch capacitor common mode feedback to stabilize the output common- mode point in the output stage to ensure the on the basis of the op amp to work properly , the open-loop gain of 72dB, unit gain bandwidth of 47MHz , the slew rate of 40 V / μs . Dynamic latch comparator with hysteresis comparator , followed by the SR flip-flop , ± 1V input voltage difference across the the positive hysteresis of the comparator 26.9848mV negative hysteresis 24.7784mV . Then also designed undervoltage protection circuit and the clock generation circuit . Overall circuit simulation , and its output modulated signal using MATLAB noise cancellation and FFT analysis get SNDR 112.3dB , the ENOB for 18.37 .

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CLC: > Industrial Technology > Electrotechnical > Electrical measurement techniques and instruments > Power the number of measurements and instrumentation > Power measurement,power meter
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