Log-domain first-order multifunction current-mode filter design


IEEE 14th Signal Processing and Communications Applications, Antalya, Turkey, 16 - 19 April 2006, pp.301-302 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.1109/siu.2006.1659700
  • City: Antalya
  • Country: Turkey
  • Page Numbers: pp.301-302
  • Dokuz Eylül University Affiliated: Yes


A new log-domain first-order multifunction filter is proposed in this paper. The proposed filter is systematically derived using the state-space synthesis procedure from a corresponding block diagram. It provides lowpass, highpass, and allpass responses simultaneously for a single input signal. The filter circuit has a very simple structure, since it uses only BJTs and a grounded capacitor. It can be electronically tuned by changing an external current. The filter has a greater bandwidth due to inherently current-mode and log-domain operation. PSPICE simulations are given to confirm the theoretical analysis.