Current-mode universal filter using current feedback amplifiers

A new current-mode (CM) universal filter based on and employing three each of non-inverting current feedback amplifiers (CFAs), capacitors, and resistors is presented. Without changing the circuit topology the output currents simultaneously supports lowpass (LP), highpass (HP). and bandpass (BP) responses. The notch (BR) and allpass (AP) filtering functions can be achieved by connecting the appropriate nodes without requiring the use of additional components. The proposed circuit enjoys low passive sensitivities and orthogonal tuning of the parameters natural frequency, omega(0) and quality factor, Q. Personal computer-simulation programme with integrated circuit emphasis (PSPICE) simulated results agree well with calculated values.