Design of a Versatile Voltage-Mode Filter Based on OA and OTA
Xiao Ben · Science Technology and Engineering · 2008
A new two-order voltage-mode filter which only uses active devices such as Operational Amplifiers(OAs)and Operational Transconductance Amplifiers(OTAs)is introduced.The proposed filter can realize five transfer functions,such as LP,HP,BP,BS and AP,by choosing the different input and output terminals.Also the circuit characteristics,including center frequency and quality factor,can be electronically tuned by adjusting the transconductance gains of the OTAs.It only uses two OAs and two OTAs in this filter.Its structure is simple but the functions are versatile and the proposed filter is easy to be integrated.Results from PSPICE show that this design is feasible.