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http://dx.doi.org/10.5762/KAIS.2014.15.12.7287

Analyzing of CDTA using a New Small Signal Equivalent Circuit and Application of LP Filters  

Bang, Junho (Department of IT Applied System Engineering, Smart Grid Research Center, Semiconductor Design Education Center, Chonbuk National University)
Song, Je-Ho (Department of IT Applied System Engineering, Smart Grid Research Center, Semiconductor Design Education Center, Chonbuk National University)
Lee, Woo-Choun (Department of IT Applied System Engineering, Smart Grid Research Center, Semiconductor Design Education Center, Chonbuk National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.15, no.12, 2014 , pp. 7287-7291 More about this Journal
Abstract
A CDTA (current differencing transconductance amplifier) is an active building block for current mode analog signal processing with the advantages of high linearity and a wide frequency bandwidth. In addition, it can generate a stable voltage because all the differencing input current flows to the grounded devices. In this paper, a new small signal equivalent circuit is proposed to analyze a CDTA. The proposed small signal equivalent circuit provides greater precision in analyzing the magnitude and frequency response than its previous counterparts because it considers the parasitic components of the input, internal and output terminal. In addition, observations of the changes made in various devices, such as the resistor (Rz) confirmed that those devices heavily influence the characteristics of CDTA. The designed parameters of the proposed small signal equivalent circuit of the CDTA provides convenience and accuracy in the further design of analog integrated circuits. For verification purposes, a 2.5 MHz low pass filter was designed on the HSPICE simulation program using the proposed small signal equivalent circuit of CDTA.
Keywords
Current mode; Lowpass filter; Small signal equivalent circuit; Transconductance amplifier;
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