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Fully Differential CMOS Current Feedback Operational Amplifier

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Abstract

This paper presents a new CMOS fully differential current feedback operational amplifier (FDCFOA). The proposed CMOS realization of the FDCFOA is based on a novel class AB fully differential buffer circuit. Besides the proposed FDCFOA circuit is operating at supply voltages of ±1.5 V, it has a total standby current of 400 μA. The applications of the FDCFOA to realize variable gain amplifier, fully differential integrator, and fourth order fully differential maximally flat low pass filter are given. The fourth order filter provides 8 dB gain and a bandwidth of 4.3 MHz to accommodate the wideband CDMA standard. The proposed FDCFOA and its applications are simulated using CMOS 0.35 μ m technology.

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Authors and Affiliations

  1. Electronics and Communications Engineering Department, Cairo University, Fayoum Branch, Egypt

    Soliman A. Mahmoud & Inas A. Awad

Authors
  1. Soliman A. Mahmoud
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  2. Inas A. Awad
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Additional information

Soliman A. Mahmoud was born in Cairo, Egypt, in 1971. He received the B.Sc. degree with honors, the M.Sc. degree and the Ph.D. degree from the Electronics and Communications Department, Cairo University—Egypt in 1994, 1996 and 1999 respectively. He is currently an Assistant Professor at the Electrical Engineering Department, Cairo University, Fayoum-Campus. His research interests include low voltage analog CMOS circuit design, filtering and applications suitable for VLSI.

Inas Awad was born in Cairo, Egypt, in 1971. She received the Bachelor, the M.Sc. and the Ph.D. degrees in Electronics and Communications from Cairo University in 1994, 1997 and 2000, respectively. In 1995, she joined the department of Electronics and Communications, Cairo University, Fayoum-Campus as a teaching assistant and now she is an Assistant Professor at the same department. Her primary research interest is in analog circuits with particular emphasis on current-mode approach and low-voltage low-power CMOS designs.

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Mahmoud, S.A., Awad, I.A. Fully Differential CMOS Current Feedback Operational Amplifier. Analog Integr Circ Sig Process 43, 61–69 (2005). https://doi.org/10.1007/s10470-005-6571-1

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  • DOI: https://doi.org/10.1007/s10470-005-6571-1

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