簡介

在此論文中，我們提出一個負轉阻放大器。由於其本身的低輸入和低輸出阻抗特性，其操作頻率可以高於傳統的放大器。在使用回授架構下，放大器的操作頻率可以獲得提升。藉由一個簡單的回授電阻，放大器可以在不使用共模回授電路的情況下，其輸出準位可以達到穩定。
此轉阻放大器在當作一個主動元件時其應用性是很廣泛的，其應用電路的特性可以由電路本身的被動元件來決定。在由轉阻放大器與電容所組成的帶通濾波器與低通濾波器中，其中心頻率、截止頻率和品質因數皆可以被調整。且由於可被忽略的負載效應，單級的二階濾波器可以串接形成高階的濾波器。在電壓控制的震盪器中，其震盪頻率也可以被調整。

Abstract

A simple negative transimpedance amplifier is proposed. Because of inherent low input and output impedance, the frequency response is higher than that of the traditional operational amplifier. Using feedback, the operation frequency of amplifier can be extended. By using a simple feedback resistance, the amplifier’s output level is stabilized without using common-mode feedback.
The negative transimpedance amplifier as a common active element is versatile. The characteristics of these application circuits are dominated by the passive elements of the circuits. In the transimpedance-C bandpass filter and transimpedance-C lowpass filter, the , , and Q factor can be tuned. Owing to the negligible loading effect of the transimpedance amplifier, the single stage Rm-C biquad can be cascaded to high order filters. In the voltage controlled oscillator, the oscillation frequency can also be tuned.

Contents
1. Introduction 1
2. The trans-impedance amplifier 3
2.1 The types of amplifiers 3
2.2 The transimpedance amplifier characteristics 6
2.3 The current feedback amplifier 10
2.4 Simulation Result 12
3. The transimpedance-C band-pass filter 15
3.1 The Filter 15
3.2 The transimpedance-C (Rm-C) bandpass filter 17
3.3 Simulation results 18
4. The transimpedance-C lowpass filter 22
4.1 The filter 22
4.2 Simulation results 23
5. The sinusoidal oscillator 25
5.1 The transimpedance amplifier based oscillator 26
5.2 Simulation results 27
6. Conclusion 29
7. Reference 30

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