A Voltage-Mode First Order Allpass Filter Based on VDTA

• Main Authors: Suwat Maneewan, Nawee Udorn, Phamorn Silapan, Danupat Duangmalai, Winai Jaikla
• Format: Article
• Language: English
• Published: VSB-Technical University of Ostrava 2014-01-01
• Series: Advances in Electrical and Electronic Engineering
• Subjects: allpass filter; vdta; voltage-mode.
• Online Access: http://advances.utc.sk/index.php/AEEE/article/view/846

This article presents a new voltage-mode first order allpass filter (APF) employing voltage differencing transconductance amplifier (VDTA). The advantages of the circuit are that: the circuit description is very compact, consists of merely a VDTA and a capacitor: the phase shift can be electronically adjusted by current bias: it provides the lower THD of the output signal. Without any component matching conditions, the proposed circuit is very appropriate to further develop into an integrated circuit. Moreover, the proposed APF can provide the output current with high output impedance without modification of the circuit topology. The PSpice simulation results are depicted. The given results agree well with the theoretical anticipation. The maximum power consumption is 400µW at ±1.25V power supplies.