Design of a fully differential current mode operational amplifier with improved input-output impedances and its filter applications

Mustafa Altun; Hakan Kuntman

doi:10.1016/j.aeue.2007.03.020

Design of a fully differential current mode operational amplifier with improved input-output impedances and its filter applications

Mustafa Altun^*, Hakan Kuntman

^*Corresponding author for this work

Department of Electronics and Communication Engineering

Istanbul Technical University

Research output: Contribution to journal › Article › peer-review

46 Citations (Scopus)

Abstract

In this paper, a CMOS implementation of a fully differential current-mode operational amplifier (COA) is presented. To achieve very low input resistance, a new technique based on a positive feedback is used in the input transimpedance stage. Additionally, traditional current output stage (Arbel Goldminz output stage) with improved output resistance is selected as a transconductance stage. Results of simulations exhibit 96 dB DC gain, nearly 120 Ω input, 30 M Ω output resistances and a gain-bandwidth product exceeding 90 MHz. The proposed COA is operated under ± 1.5 V voltage supplies and designed with 0.35 - μ m CMOS process. Furthermore, COA-based fourth-order band-pass (BP) filter consisting of Butterworth low-pass (LP) and high-pass (HP) filters is realized as an application example. SPICE simulation results are included to verify correctness of the designs.

Original language	English
Pages (from-to)	239-244
Number of pages	6
Journal	AEU - International Journal of Electronics and Communications
Volume	62
Issue number	3
DOIs	https://doi.org/10.1016/j.aeue.2007.03.020
Publication status	Published - 3 Mar 2008

Keywords

COA-based filters
Fully differential COA

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10.1016/j.aeue.2007.03.020

Cite this

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abstract = "In this paper, a CMOS implementation of a fully differential current-mode operational amplifier (COA) is presented. To achieve very low input resistance, a new technique based on a positive feedback is used in the input transimpedance stage. Additionally, traditional current output stage (Arbel Goldminz output stage) with improved output resistance is selected as a transconductance stage. Results of simulations exhibit 96 dB DC gain, nearly 120 Ω input, 30 M Ω output resistances and a gain-bandwidth product exceeding 90 MHz. The proposed COA is operated under ± 1.5 V voltage supplies and designed with 0.35 - μ m CMOS process. Furthermore, COA-based fourth-order band-pass (BP) filter consisting of Butterworth low-pass (LP) and high-pass (HP) filters is realized as an application example. SPICE simulation results are included to verify correctness of the designs.",

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AB - In this paper, a CMOS implementation of a fully differential current-mode operational amplifier (COA) is presented. To achieve very low input resistance, a new technique based on a positive feedback is used in the input transimpedance stage. Additionally, traditional current output stage (Arbel Goldminz output stage) with improved output resistance is selected as a transconductance stage. Results of simulations exhibit 96 dB DC gain, nearly 120 Ω input, 30 M Ω output resistances and a gain-bandwidth product exceeding 90 MHz. The proposed COA is operated under ± 1.5 V voltage supplies and designed with 0.35 - μ m CMOS process. Furthermore, COA-based fourth-order band-pass (BP) filter consisting of Butterworth low-pass (LP) and high-pass (HP) filters is realized as an application example. SPICE simulation results are included to verify correctness of the designs.

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Design of a fully differential current mode operational amplifier with improved input-output impedances and its filter applications

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Keywords

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