Design of Differentiator and Oscillator Employing Active Current-Mode Elements

• Main Authors: Guang-Yuan Chen, 陳光遠
• Other Authors: Jiun-Wei Horng
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/87z2nc

碩士 === 中原大學 === 電子工程研究所 === 91 === Abstract In this thesis, a new non-inverting RC active differentiator network and a new quadrature oscillator using unity-gain cells are presented. First, we present a non-inverting differentiator using one current feedback amplifier (CFA), five resistors and one grounded capacitor. This circuit provides the following advantages: (1) small time constant can be achieved by adjusting a single grounded resistor; (2) the use of only grounded capacitor that is ideal for integrated circuit implementation; (3) because the output impedance of the CFA is very low, the output terminals of the proposed circuit can be directly connected to the next stage. Secondly, we present a quadrature oscillator using one unity-gain current follower (CF), three unity-gain voltage followers (VFs), three resistors and three grounded capacitors. This circuit provides the following advantages: (1) the tracking errors of the unity-gain cells have no effects on the oscillation frequency; (2) the oscillation condition and oscillation frequency are orthogonal controllable; (3) it has low output impedance; (4) the active and passive sensitivities are low; (5) the use of only grounded capacitors that is ideal for integrated circuit implementation. In the end, experimental results are given to demonstrate the feasibility of the proposed circuits.