Current-Mode First-Order Allpass Filter Employing Single Current Operational Amplifier

  • Selçuk Kilinç
  • Uğur Çam
Article

DOI: 10.1023/B:ALOG.0000038282.60137.5f

Cite this article as:
Kilinç, S. & Çam, U. Analog Integrated Circuits and Signal Processing (2004) 41: 47. doi:10.1023/B:ALOG.0000038282.60137.5f

Abstract

A current-mode first-order allpass filter configuration is proposed. The presented circuit uses a single current operational amplifier (COA), a resistor and a capacitor, which are of minimum number. High output impedance of the proposed filter enables the circuit to be cascaded without additional buffers. The proposed circuit is insensitive to parasitic input capacitances and input resistances due to internally grounded input terminals of COA. It does not impose any component matching constraint in analog signal processing circuits. Non-ideal effects of COA to the first-order allpass network are also investigated. To demonstrate the performance of the proposed filter a new current-mode quadrature oscillator is given as an application example. The theoretical results are verified with PSPICE simulations using a new realization of fully differential CMOS COA.

current-mode circuitsallpass filtercurrent operational amplifier

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Selçuk Kilinç
    • 1
  • Uğur Çam
    • 1
  1. 1.Dokuz Eylül University, Department of Electrical and Electronics EngineeringBuca, IzmirTurkey