可用於訊號處理之Gm-C可程式類比陣列晶片設計

Abstract

本論文旨在提出並分析了一種適用於工業控制用途的可程式類比陣列（FPAA）設計概念，大致上整體電路乃是經由可配置類比方塊（CAB）與連線網路兩要素所構成，所以FPAA能夠透過規劃以上兩項基本單元來建構出所需的類比函數，使得本系統的最大優點即在於可將類比電路設計提升至系統層次。為了增加CAB本身的工作頻率，採用了屬於電流傳遞模式的Gm-C技術來達成此目的，並以具可規劃性的轉導器與電容為其主要構成元件。另外文中也將會討論利用負迴授理論來改善轉導器線性度的有效策略，並配合能夠穩定轉導值與電容值比例的頻率校正電路，來共同有效地增進系統效能。最後，由於每個CAB都能用於實現擁有兩組輸入與一組輸出的一階濾波器並符合TSMC 0.35μm Mixed-Signal 2P4M（3.3/5V）製程參數，所以只要將多組CAB相互結合後便能得到較為複雜的高階濾波器。

In this thesis, a field programmable analog array (FPAA) appliable for industrial control is presented and analyzed. The whole system is composed of configurable analog blocks (CABs) and interconnection network. Through programming the two circuit groups above, FPAA can be reconfigured to implement many desired analog functions along system level. Each CAB consists of three programmable operational transconductance amplifiers and capacitors. The current mode Gm-C technique is used to increase operating frequency. In this thesis, the strategy used to modify the linearity of tranconductor through negative feedback method is proposed to improve the linearity performace. In addition, a circuit based on frequency tunuing is also considered to obtain the precise ratio of transconductance and capacitance. The proposed CAB is designed to realize a first-order filter with two inputs and one output, so the combination of CABs can implement a more complex high-order filter. Finally, the entire procedure of design is set to match the parameters of TSMC 0.35μm Mixed-Signal 2P4M (3.3/5V) process.