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    Please use this identifier to cite or link to this item: http://ccur.lib.ccu.edu.tw/handle/A095B0000Q/400


    Title: 手持式超音波系統之發射器穩壓脈波調變與高精度相位調整接收器模組設計;PWM Controller of a Transmitter and High-Precision Phase Adjustment of a Receiver for a Portable Ultrasound System
    Authors: 江政霖;CHIANG, CHENG-LIN
    Contributors: 電機工程研究所
    Keywords: 直流至直流轉換器;脈波寬度調變(PWM);低電壓差動訊號接收器IP;高精度相位調整電路;DC to DC Converter;Pulse Width Modulation (PWM);Low-Voltage Differential Signal (LVDS) data receiver IP;High-Precision Phase Adjustment
    Date: 2017
    Issue Date: 2019-07-17
    Publisher: 電機工程研究所
    Abstract: 現今超音波領域的發展越來越盛興,掃描儀相關產品的需求量也跟著增加,且越來越多產品已經轉往手持式系統發展,因此在超音波系統內部的發射器與接收器也以減少晶片佈局面積、功率消耗、增加穩定性與準確度為持續去改善之目標,發射器方面Power Supply是由DC-DC Converter轉換提供,電壓轉換過程的穩定性是一大考量,確保發射之訊號準確度;接收器之傳輸介面又以低電壓差動訊號傳輸應用廣泛,具備有高速、低功率消耗、高抗雜訊優等優點。本論文提出一組電壓模式控制之穩壓脈波調變(PWM Controller)控制電路,其原理是由直流至直流轉換輸出之電壓經過回授分壓,由誤差放大器偵測回授分壓與參考電壓之壓差並輸出一組參考準位電壓,最後由另一組比較器輸入參考準位與一週期固定之振盪鋸齒波去比較,以控制脈波之Duty Cycle,調節電壓轉換穩定性,另一方面也將正、負壓源之回授輸入整合至同一顆晶片內部,以方便與Pulser系統電源做整合,此設計是採用世界先進 VIS 0.5μm 高壓製程進行電路設計與模擬,Open-Loop Gain為83dB,負電壓(0~-5V)轉正電壓(0~5V)功能正常;低電壓差動訊號接收器方面,本文提出了改良式的延遲相位調整器,將單為延遲級數擴充成32級,由我們所設計的32組二對一多工器去做高、低頻操作的切換,來增加其每一級單位延遲的精準度,及整體的延遲時間,並以『隔離』、『閘控』與『減少switch activities』的概念來減少功率消耗,整體的佈局為280x76.2μm^2,單為延遲精度為0.268ns,功率消秏為1.18mW,以此為架構整合至低電壓差動系統中,並完成低電壓差動訊號十六通道接收器之電路,消耗功率為520mW;此設計採(CIC)所提供的台積電 TSMC 0.18μm 1P6M CMOS 標準製程進行電路設計模擬,以上模擬結果驗證功能皆正確無誤,八通道部分已下線成功。
    Nowadays, the development of the ultrasound field has become more and more flourishing, and the demand increased for scanner-related products, There are more and more products has been transferred to portable systems. Therefore, in the ultrasonic system, there has several improved points, reducing the chip layout area, power consumption, increasing stability and accuracy for the goal of the transmitter and receiver, the transmitter side of the power supply is provided by the DC-DC converter to convert, the stability of the voltage conversion process is a major consideration to ensure that signal accuracy; On the receiver side, the low-voltage differential signal (LVDS) transmission widely used for transmission interface, It has several advantages, like high-speed, low power consumption, and the best anti-noise capability.In this paper, We purpose a voltage mode control of PWM Controller for voltage regulating , the principle is coming from DC to DC conversion output voltage through the feedback voltage, Then using the error amplifier to detect the feedback voltage and bandgap reference voltage difference between the voltage and output a reference level voltage, finally we use the other comparator, using reference level voltage as input to positive side and a fixed cycle oscillation sawtooth wave as input to negative side, by comparing both inputs to control the Duty Cycle width for adjust the stability of voltage conversion, In addition, the positive and negative voltage source feedback into the same chip to facilitate the integration with the pulser system of ultrasound, The purposed PWM controller has been fabricated by VIS 0.5μm high-voltage process for circuit design and simulation, Open-Loop Gain is 83dB, FBN(0~-5V) to transform FBP(0~5V) function is correct;On the other hand , We purpose a modified delay phase adjuster of low-voltage differential signal (LVDS) receiver, the single delay cell expansion into 32 step, we use 32 groups 2 to 1-multiplexer to select high or low frequency operation switch for increasing the accuracy of unit delay on each cell, and the overall maximum delay time, by "isolation", "gate control" and "reducing switch activities" concept to reduce the power consumption, the overall layout area is 280x76.2?μm?^2, delay cell precision is 0.268ns, and power consumption is 1.18mW, as the structure into the low-voltage differential system, and achieve the low-voltage differential signal 16 channel receiver circuit; The proposed has been fabricated by TSMC 0.18μm 1P6M CMOS standard process provided by (CIC) for circuit design and simulation. The simulation verify its function work, and eight-channel part has been successfully tape out.
    Appears in Collections:[電機工程研究所] 學位論文

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