Analog filter circuit design

• Main Authors: chfa huang, 黃志發
• Other Authors: 張振豪
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/43740565617656547156

碩士 === 國立中興大學 === 電機工程學系 === 91 === This thesis described the design and implementation of analog filter design. We use non-opamp-based unity gain buffer to construct high-speed filter architecture. The experiment result show that we can arrive the cutoff frequency about 200Mhz.We also realize Gm-C filter with GaAs HBT technology. A high linear transconductance is used by 4:1 emitter ratio topology and we use negative resistance to improve the output impedance of transconductance. The measurement result show that we realize a 3rd order Butterworth filter by cascading method .The cutoff frequency is about 10Mhz.We also use LC ladder signal-flow to realize 5th order Elliptic filter, which is suit for baseband frequency application. The transconductance is realized in rail-to-rail topology. In the chapter six we will realize a polyphase filter to reject the image signal . The principle of a polyphase filter is different to symmetric analog filter .We use the transformation from LP to BP to realize the image rejection. The measured results verify our design and implementation of analog filter . They also provide theory and implementation