此篇論文提出了利用電流式DAC取代傳統單雙極脈衝產生器，利用數位訊號控制脈衝輸出可有效應用在各種超音波掃描模式上，選擇以200MHZ的取樣頻率進行輸入控制，由兩組6位元DAC控制128個電流輸出源搭配100歐姆輸出負載電阻產生頻率為10MHz峰值為40Vpp之正弦波訊號。

相較於傳統脈衝產生器，電流式DAC提供更多元的輸出選擇，同時在改變脈衝振幅及振幅調變上更為容易，省去了加法器與乘法器的需求使系統更為簡潔，本電路設計結構的特點在於取代了傳統式的邏輯電路改用電流式邏輯閘MCML(Mos Current Mode Logic)運用在編碼器(Decoder)上加速編碼器(Decoder)的反應速度提升輸出訊號的弦波完整性讓第二諧波失真拉到39.9dbc，並在製程布局上利用交錯排列手法減少製程變異(Process Variation)所帶來的電流源輸出誤差。

This thesis proposes to use current type DAC to replace the traditional unipolar and bipolar pulse generator. Using digital signal to control pulse generator can be effectively used in ultrasound scanning with variety mode, Using 200Mhz sampling frequency to control double 6-bit DAC with 128 current cell current type output with 100 ohm loading resistor to generates sine wave signal with 10MHz frequency and 40V pick voltage.
Compared to conventional pulse generator , current type DAC have provide more diverse selection , make it easier to change signal amplitude and frequency, eliminating the adder and multiplier to make the system more compact , the characteristics of this work is that replaces the traditional logic circuit switch with current type logic gates MCML (Mos Current Mode Logic) using to enhance the reaction speed of the decoder that let the second harmonic distortion of the output sine wave can be pull to 39.9dbc, and reduce the process variation of current source by using staggered layout techniques .

致謝……………………………………………………… i
中文摘要………………………………………………… iv
目錄……………………………………………………… vi
圖目錄……………………………………………………viii
緒論……………………………………………………… 1
第一章 緒論………………………………………………… 1
1.1 研究動機……………………………………… 1
1.2 研究背景……………………………………… 2
第二章 電路設計與實現………………………………… 4
2.1電流式邏輯電路MCML………………………… 4
2.2高壓電流原件…………………………………… 7
2.3脈衝產生器……………………………………… 10
第三章 布局前模擬波形與參數………………………… 13
3.1佈局前模擬………………………………………13
3.2數值比較………………………………………… 16
第四章 布局考量與規劃………………………………… 17
4.1低壓元件保護與布局考量……………………… 17
4.2高壓元件布局與保護考量……………………… 20
第五章 結論與未來展望………………………………… 23

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