Realization of Second-Order Differential Type Class-AB Log-Domain Universal Filter Without Changing Circuit Configuration

Kircay A., ÇAM U.

IEEE 16th Signal Processing and Communications Applications Conference, Aydın, Turkey, 20 - 22 April 2008, pp.585-586 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.1109/siu.2008.4632682
  • City: Aydın
  • Country: Turkey
  • Page Numbers: pp.585-586
  • Dokuz Eylül University Affiliated: Yes


In this paper, a new current-mode second-order differential type class-AB log-domain universal filter is proposed. The design is based on the state-space synthesis method It has simple differential type class-AB structure and using minimum components. The proposed filter has one input and five outputs and can simultaneously realize lowpass (LP), highpass (HP), bandpass (BP), notch (N), and allpass (AP) responses without any changes in the circuit topology ne natural frequency, and the quality factor of the filter can be electronically tuned by changing external currents. Only NPN transistors and grounded capacitors were used, and operated with single power supply of 2 V. PSPICE simulations are given to confirm the theoretical analysis.