適用於離子敏感性場效電晶體之酸鹼感測計系統晶片設計研究

Research on ISFET Based pH-meter Chip Implementation using ASIC Design Methodology

詹益治(Yi-Chih Chan)

指導教授 ： 鍾文耀

中原大學/工學院/電子工程研究所/碩士(2001年)

https://doi.org/10.6840/cycu200100461

摘要

本篇論文的主要目的在於研究適用於離子敏感性場效電晶體之酸鹼感測計系統晶片的實現，包括前端的類比電路和後端數位電路的設計及實現，整個設計流程從了解原理、電路設計及模擬及實體佈局，在本論文中均有詳述。
在酸鹼感測計的系統中，經由前端訊號檢測電路、訊號準位調整電路、類比/數位轉換器所穫得的數位值為一相對的值，兩點校正電路用以將此一數值轉成絕對的數位值，而二進碼轉BCD碼電路將兩點校正電路輸出的12位元二進碼轉成4組BCD碼，以分別顯示十位、個位、小數點下一位、小數點下兩位的酸鹼值。在顯示器部份使用一3位半的數字型液晶顯示器(LCD)，LCD驅動電路可用來推動此一液晶面板。
設計方法的重點分別是；數位訊號的處理、類比電路特性的操作和混模式電路佈局設計的技巧，將於本篇論文中探討。
整體晶片的量測結果包括功率消耗及電壓準位，在前端類比電路的部分包括檢測電路、電壓調整電路和晶體振盪電路皆能正常運作。
本篇論文共完成一個晶片的設計，所有晶片的實現均委託CIC(Chip Implement Center)以聯電0.5μm DPDM的製程技術來製作完成。

關鍵字

離子敏感性場效電晶體 ； 酸鹼感測計 ； 二進碼轉BCD碼電路 ； 二點校正電路 ； LCD驅動電路

並列摘要

This thesis presents a design and implementation of mixed-mode integrated circuit chip for ISFET based pH meter applications. All of the design flow processes, such as circuit theory, circuit design and simulation and physical layout are included in this thesis.
In the pH meter system, the readings obtained after signal readout circuit, signal level tuning circuit and analog to digital converter are relative values. The two-point calibration circuit is used to obtain the absolute value. The binary to BCD code converter translates 12 bits binary code into four sets of BCD code, which can display 4 digits of pH value respectively from the two-point calibration circuit. We use a 3 1/2 digits LCD panel to display the measurement results. A LCD driving circuit is used to drive this LCD panel.
Key issues related to design methodology, signal processing, circuit operation and mixed-signal physical layout skills are developed in this thesis.
The whole chip measure results include power consumption and voltage position. The analog circuit includes signal readout, signal level tuning and oscillator can function work.
In this thesis, single chip has been implemented. The chip has been implemented using UMC 0.5um DPDM process technology through CIC (Chip Implement Center).

並列關鍵字

Two-point calibration circuit ； Binary to BCD code converter ； ISFET ； pH meter ； LCD driving circuit

參考文獻

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