使用電流式元件所設計之振盪器

The study of Oscillators using Current-mode elements

張志瑋(Chin-Wei Chang)

指導教授 ： 侯俊禮

中原大學/工學院/電子工程研究所/碩士(2007年)

https://doi.org/10.6840/cycu200700317

摘要

此篇論文提出了兩個以電流回授放大器(Current Feedback Amplifier；CFA)所設計之振盪器電路。電流式電路具有許多優點，有較大的頻寬、較好的線性度、較高的迴轉率、較寬的線性範圍及較低的功率消耗。而以最少之被動與主動元件來設計，此點也值得關切。故類比信號處理系統廣泛地在電流式領域被實現。
第一個電路提出以兩個運算轉阻放大器(Operational Transresistance Amplifier；OTRA)及電阻器所設計之正交振盪器。此振盪器可以產生兩個相位差為90° 之弦波，而且在本文所設計之振盪器電路，不需再外加電容器，只需兩個運算轉阻放大器以及兩個電阻器即可產生振盪。我們用運算轉阻放大器之主極點的觀念分析此電路。而第二個電路提出了以兩個CFA及電阻和電容構成之頻率可調振盪器。

關鍵字

運算轉阻放大器 ； 第二代電流轉移器

並列摘要

Two oscillator circuits using current feedback amplifiers are proposed. Current-mode circuits have many advantages such as wider bandwidth, better linearity, higher slew-rate, wider dynamic range and low power consumption. Circuit designs with less number passive components and the active elements have received wider attention. The realization of analog signal processing systems are extensively studied.
The first oscillator circuit use two operational transresistance amplifiers (OTRAs) and two resistors to form a quadrature oscillator. The quadrature oscillator can produce two sinusoidal waves with 90° phase difference. The circuit can oscillate without external capacitor. We analyze the circuit employing the dominant pole of OTRAs. The second oscillator circuit uses two current feedback amplifiers, resistors and capacitors to form a tunable frequency oscillator.

並列關鍵字

CCII ； OTRA

參考文獻

1. B. Wilson, “Constant bandwidth voltage amplification using current conveyor,” International Journal of Electronic, vol.65, no.5, pp.983-988, 1988.

2. K. C. Smith, A. Sedra, Microelectronic Circuits, 5th ed, New York: Oxford, 2004.

3. M. W. Allam, and M. I. Elmasry, “Dynamic current mode logic (DyCML), a new low-power high-performance logic family,” IEEE Proc. CICC, pp. 421-424, 2000.

4. B. Wilson, “Recent developments in current conveyors and current-mode circuits,” IEE Proc. G, 137, pp.63-77, 1990.

5. A. F. Arbel, and L. Goldminz, “Output stage of current-mode feedback amplifiers, theory and applications,” Analog Integrated Circuits and Signal Processing, 2, pp.243-255, 1992.