Abstract
The realization of current-mode biquad filter using current controlled current follower transconductance amplifiers (CCCFTAs) and grounded capacitors is presented. The proposed filter can simultaneously provide three standard transfer functions (low pass, high pass and band pass filter). The tuning of quality factor can be done without affecting the pole frequency. Low input and high output impedances of the configurations enable the circuit to be cascaded without additional current buffers. The use of only grounded capacitors is ideal for integration. The circuit performances are depicted through PSpice simulations, they show good agreement to theoretical anticipation.
Highlights
Active filter is important in electrical and electronic applications, widely used for continuous-time signal processing
With growing interest in design of current-mode filters, more attention is being paid to the filters which have the high-output impedance because they make them easy to drive loads and they facilitate cascading without using a buffering device [4], [5]
Herencsar et al [7] introduced the modification of CFTA, called current controlled current follower transconductance amplifier (CCCFTA) which the parasitic resistance at input terminal is electronically tuned
Summary
Active filter is important in electrical and electronic applications, widely used for continuous-time signal processing. The synthesis and design of analog filters using modern electronically controllable active building blocks (ABBs) give flexibility and convenience for designer. Herencsar et al [7] introduced the modification of CFTA, called current controlled current follower transconductance amplifier (CCCFTA) which the parasitic resistance at input terminal is electronically tuned. It seems to be a versatile component in the realization of a class of analog signal processing circuits, especially analog frequency filters. The high pass function of filter in [7] is not easy to cascade in current-mode circuit because this output current flows through the grounded capacitor. The tuning of quality factor can be done without affecting the pole frequency
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
