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2008•Natural Science Journal of Xiangtan UniversityRequires access

The Design of First-Order Current-Mode Log-Domain Filter

Yicheng Zeng

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Abstract

This paper proposes a design method of current-mode lowpass log-domain filter,which is derived from the transfer function.The first-order one is implemented.Based on the structure relative among first-order lowpass,highpass,and allpass filter,we design the log-domain first-order multifunction filter.The proposed filter has a simple structure.PSPICE simulations show that it has good frequency response,and it can be operated at low voltage and electronically tuned by changing an external current.

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What this paper is about

This paper proposes a design method of current-mode lowpass log-domain filter,which is derived from the transfer function.The first-order one is implemented.Based on the structure relative among first-order lowpass,highpass,and allpass filter,we design the log-domain first-order multifunction filter.The proposed filter has a simple structure.PSPICE simulations show that it has good frequency response,and it can be operated at low voltage and electronically tuned by changing an external current.

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Available abstract

This paper proposes a design method of current-mode lowpass log-domain filter,which is derived from the transfer function.The first-order one is implemented.Based on the structure relative among first-order lowpass,highpass,and allpass filter,we design the log-domain first-order multifunction filter.The proposed filter has a simple structure.PSPICE simulations show that it has good frequency response,and it can be operated at low voltage and electronically tuned by changing an external current.

Key concepts: All-pass filter, High-pass filter, Low-pass filter, Filter (signal processing), Filter design, Voltage-controlled filter, Transfer function, Active filter

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