State-space synthesis of current-mode first-order log-domain filters

KIRÇAY A., ÇAM U.

Turkish Journal of Electrical Engineering and Computer Sciences, vol.14, no.3, pp.399-416, 2006 (SCI-Expanded, Scopus, TRDizin) identifier

  • Publication Type: Article / Article
  • Volume: 14 Issue: 3
  • Publication Date: 2006
  • Journal Name: Turkish Journal of Electrical Engineering and Computer Sciences
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.399-416
  • Keywords: Current-mode circuits, Log-domain filters, State-space synthesis
  • Dokuz Eylül University Affiliated: Yes

Abstract

This paper proposes current-mode first-order log-domain filters, which are systematically derived using the state-space synthesis procedure. First-order low-pass, high-pass, and all-pass responses are obtained with different circuit types. The filter circuits have very simple structures, since they use only bipolar junction transistors (BJTs) and a grounded capacitor. They can be electronically tuned by changing an external current. The filters have a greater bandwidth due to inherently current-mode and log-domain operation. PSPICE simulations are given to confirm the theoretical analysis. © TÜBİTAK.