Multi-bit ΔΣ modulator using single-bit single-clock quantizer
سال انتشار: 1397
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 510
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شناسه ملی سند علمی:
TECCONF03_049
تاریخ نمایه سازی: 5 آبان 1397
چکیده مقاله:
A new multi-bit ΔΣ modulator based on tracking quantizer is presented. The proposed quantizer utilizes a comparator, a single-bit digital to analogue converter (DAC) and the related control logic to predict the output of integrator into 4-bit binary code in one clock pulse. It eliminates the requirement of a flash quantizer in the multi -bit ΔΣ modulators. Therefore, the power consumption of modulator is reduced significantly and the sampling frequency can be increased without bandwidth limitation. Also, compared to the traditional tracking quantizer, a single -bit DAC is replaced with multi-level internal DAC of the quantizer that achieves a reduction of silicon area and power consumption of the proposed modulator. In order to study the performance of the proposed structure, a first-order discrete-time ΔΣ modulator is designed and simulated in 0.18 nm CMOS technology. The simulation result shows that the proposed ΔΣ modulator has a signal to noise and distortion ratio (SNDR) of 43.4 dB at 1 MHz bandwidth for Bluetooth application. The oversampling ratio (OSR) and the power consumption of the simulated modulator are 16 and 1.46 mW, respectively.
کلیدواژه ها:
analogue to digital converter ، ΔΣ modulator ، digital to analogue converter ، multi-bit quantizer ، tracking quantizer
نویسندگان
Shahbaz Reyhani
Department of electrical engineering, Faculty of engineering, University of Guilan, Rasht, Iran
Mohammad Reyhani
Department of electrical engineering, Faculty of engineering, University of Guilan, Rasht, Iran