Low input impedance current differencing unit for current mode active devices improved by positive feedback and ZC-CDBA filter application

Abstract

In current mode analog circuit design, current differencing unit is widely used at the input stage of the current mode analog building blocks. The low input impedance current differencing unit is excellent for current mode circuit realization. In the current study, the positive feedback is used for reducing the input impedance of current differencing unit. The proposed current differencing unit is tested at the input stage of the ZC-CDBA (Z copy current differencing buffered amplifier) recently published as a current mode analog building block. The proposed circuit for ZC-CDBA is verified with the KHN analog filter application. The circuit simulations are verified by using BSIM3 0.18 μm level-7 SPICE parameters.

Keywords

Current (fluid) Electrical impedance Output impedance Electronic engineering Current mirror Computer science Filter (signal processing) Amplifier Active filter Electronic circuit Spice High impedance Electrical engineering Voltage CMOS Engineering Transistor

Subject Areas

Analog and Mixed-Signal Circuit Design ·Biomedical Engineering ·Physical Sciences

CCD and CMOS Imaging Sensors ·Electrical and Electronic Engineering ·Physical Sciences

Sensor Technology and Measurement Systems ·Computer Networks and Communications ·Physical Sciences

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Low input impedance current differencing unit for current mode active devices improved by positive feedback and ZC-CDBA filter application

Abstract

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