新型濾波器與量測電路之設計與實現

Design and Implementation of New Filters and Measurement Circuits

施俊吉(Chun-Chi Shih)

指導教授 ： 黃育賢 ； 陳建中

國立臺北科技大學/電資學院/電腦與通訊研究所/碩士(2007年)

https://doi.org/10.6841/NTUT.2007.00296

摘要

本論文主要的研究重點，是以運算轉阻放大器和四端點浮接同位等流器，配合濾波器的合成方法－線性轉換法，分別實現電壓模式和電流模式之高頻三階Chebychev低通濾波器，經由線性轉換法，可以利用查表的方式，系統化地將濾波器設計出來。用運算轉阻放大器為主動元件，所設計出的濾波器電路，其電阻用MOSFET電阻電路(MRCs)取代，故被動元件只剩電容，其濾波頻寬為100MHz、漣波為1dB，此電路採用台灣積體電路公司零點三五微米互補式金屬氧化物半導體製程與HSPICE模擬軟體，電源電壓為±1.65V。用四端點浮接同位等流器為主動元件，所設計出的濾波器電路，其中的四端點浮接同位等流器是用兩顆AD844 IC實現，此濾波頻寬為1MHz、漣波為1dB。
運算轉阻放大器的另一個應用，為電流模式惠斯登電橋。主要的想法是利用全差動式運算轉阻放大器的特性，配合三個精密電阻和一個未知電阻，經由輸出電壓差值來計算出未知電阻之數值，此電路的精確度可高達98％，且量測範圍可以隨著輸入電流和電阻調整。我們採用台灣積體電路公司零點三五微米互補式金屬氧化物半導體製程，電源電壓為±1.65V，直流輸入掃描範圍為±2mA，頻寬為277MHz，功率損耗為177.92mW，晶片面積(含PAD)為0.7866 × 1.0178 mm2。

關鍵字

運算轉阻放大器 ； 四端點浮接同位等流器 ； 濾波器 ； 惠斯登電橋

並列摘要

The thesis aims at designing and implementing high-frequency voltage-mode and current-mode third-order Chebychev low-pass filters, using operational transresistance amplifiers (OTRA) and four-terminal floating nullors (FTFN) by linear transformation synthesis method. Through linear transformation, we can design the filter systematically with proposed design tables.
MOSFET resistor circuits are used to replace the resistors in the OTRA-based filters. As a result, the only passive components to be found in the filter are capacitors. The filter has a bandwidth of 100MHz with 1dB ripple and is implemented using TSMC 0.35μm CMOS process plus HSPICE simulation with a power supply of ±1.65V. The filter using FTFN which is implemented by two AD844 has a bandwith of 1MHz with 1dB ripple.
Another application of OTRA is the current-mode Wheatstone bridge. The main idea is to utilize the features of a fully differential OTRA and three precision resistors to measure one unknown resistor. Value of the resistor is calculated based on the output voltage, and precision of the circuit is as high as 98%. Moreover, the measuring range is adjustable by regulating the input current and the resistors.
The Wheatstone bridge is implemented using TSMC 0.35μm CMOS process with a power supply of ±1.65V. The DC input sweep range is ±2mA, the bandwidth 277MHz, the power consumption 177.92mW, and chip area with PAD included 0.7866×1.0178 mm2。

並列關鍵字

OTRA (operational transresistance amplifiers) ； FTFN (four-terminal floating nullors) ； Filter ； Wheatstone Bridge

參考文獻

論文，國立海洋大學電機工程學系暨研究所，基隆，2001。

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