10-bit 2-stage Time to Digital Converter for Raman Spectroscopy
Mahantesh P Mattada1, Hansraj Guhilot2

1Mahantesh P Mattada, Dept. of Electronics, Sanjay Ghodawat University, Kolhapur, India.
2Hansraj Guhilot, KC College of Engineering, Thane, Mumbai University, India.

Manuscript received on 02 June 2019 | Revised Manuscript received on 10 June 2019 | Manuscript published on 30 June 2019 | PP: 2744-2749 | Volume-8 Issue-8, June 2019 | Retrieval Number: H7413068819/19©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: Two stage 10-bit Time to Digital Converter is designed and verified in a commercial VLSI CAD tool. VCO driven counter is used in the first stage as coarse stage, whereas TDC based second stage is used for fine conversion. Each stage will give 5bit resolution and works concurrently during the conversion process. Delay-line/Flash TDC is used in the second stage because of its better conversion speed. Flash TDC will give thermometer code and a binary encoding scheme is required. To make it simple and area efficient, ROM based Thermometer to Binary(T2B) converters are used in the final readout module. Average power dissipation of 1.155mW for overall system is measured.
Keyword: Raman Spectroscopy, Delayed Chlorophyll Fluorescence, TDC, VCO, Delay Line TDC, Time gated Raman Spectroscopy.
Scope of the Article: Digital System and Logic Design.