Realization of Low-Voltage Modified CBTA and Design of Cascadable Current-Mode All-Pass Filter

Ayten U. E., Sagbas M., Minaei S.

RADIOENGINEERING, vol.23, pp.523-531, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 23
  • Publication Date: 2014
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.523-531
  • Keywords: Modified current backward transconductance amplifier (MCBTA), current-mode circuits, all-pass filter, active networks
  • Yıldız Technical University Affiliated: Yes


In this paper, a low voltage modified current backward transconductance amplifier (MCBTA) and a novel first-order current-mode (CM) all-pass filter are presented. The MCBTA can operate with +/- 0.9 V supply voltage and the total power consumption of MCBTA is 1.27 mW. The presented all-pass filter employs single MCBTA, a grounded resistor and a grounded capacitor. The circuit possesses low input and high output impedances which make it ideal for current-mode systems. The presented all-pass filter circuit can be made electronically tunable due to the bias current of the MCBTA. Non-ideal study along with simulation results are given for validation purpose. Further, an nth-order cascadable all-pass filter is also presented. It uses n MCBTAs, n grounded resistors and n grounded capacitors. The performance of the proposed circuits is demonstrated by using PSPICE simulations based on the 0.18 mu m TSMC level-7 CMOS technology parameters.