此篇論文提出了一個使用source degeneration、cross-couple、translinear loop 達到高線性的高範圍轉導器。在1V的輸入範圍下，轉導值可調範圍為220μs 到 1050μs，而總諧波失真是-50dB在0.6Vpp。而且把它應用在一個五階的elliptic 低通濾波器，可調範圍是低頻的5Mhz到10Mhz。

This thesis has described a wide tuning range transconductor combining source degeneration, cross-coupled, translinear loop to achieve high linearity. The transconductance tuning range from 220μs to 1050μs with 1V input range and the total harmonic distortion is -50dB with 0.6Vpp input voltage. And its application to a fifth-order elliptic low-pass Gm-C filter for the front-end RF circuit is presented. In order to transform the passive element circuit into a Gm-C based filter, a GIC flow method has been used. The proposal Gm-C based filter achieve a with performance a low frequency filtering range from 5Mhz to 10Mhz by transconductance tuning.

Table of Content
CHAPTER 1 1
Introduction 1
1.1 Motivation 1
1.2 Research Objectives 4
1.3 The Organization of This Thesis 5
CHAPTER 2 6
The Concepts of Filter 6
2.1 Filter Overview 6
2.2 Active RC and Gm-C filter Overview 8
2.2.1 Active RC 8
2.2.2 Gm-C Filter 9
2.3 Transconductor Overview 10
CHAPTER 3 15
A High Linearity and wide tuning range Gm-C Filter 15
3.1 Introduction 15
3.2 Circuit Design 21
3.2.1 Transconductor 21
3.2.2 Fifth-order elliptic low-pass Gm-C filter 24
3.2.2.1 The General impedance converter circuit 24
3.2.2.2 Passive fifth-order elliptic low-pass filter 27
3.2.3 Basic components used in GIC 28
3.2.4 Fifth-order Elliptic Low-Pass Gm-C Filter 31
3.3 Simulation result 33
CHAPTER 4 37
Conclusion 37
Reference 38

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