New current-mode special function continuous-time active filters employing only OTAs and OPAMPs

Erdogan E., Topaloglu R., Kuntman H., Cicekoglu O.

INTERNATIONAL JOURNAL OF ELECTRONICS, cilt.91, sa.6, ss.345-359, 2004 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 91 Sayı: 6
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1080/002072140410001695237
  • Dergi Adı: INTERNATIONAL JOURNAL OF ELECTRONICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.345-359
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

This paper reports three current mode second order filters, each of which realizes a specific function without any external passive elements. These filters realize low-pass notch (LPN), high-pass notch (HPN) and all-pass (AP) functions. Two OPAMPs, a double output OTA and a single output OTA are employed for each circuit. The filter structures can be easily cascaded since they have high output impedances. This property is especially useful for achieving high-order filters using these LPN and HPN filters as building blocks. The presented theory is verified with macro models in SPICE simulations and, using the SPICE parameters of the layout technology, post layout simulations are carried out, with parasitics extracted from the layouts of the filter chips.