本篇文章提出以兩個運算轉阻放大器(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。本文我們用運算轉阻放大器之主極點的觀念分析此電路。
In this paper, the authors use two operational transresistance amplifiers (OTRAs) and two resistors to design 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 OTRA.