SFG synthesis of general high-order all-pass and all-pole current transfer functions using CFTAs

Tangsrirat, Worapong

doi:10.1155/2014/271926

SFG synthesis of general high-order all-pass and all-pole current transfer functions using CFTAs

Author(s)

Tangsrirat, Worapong

Date Issued

January 1, 2014

Type

Article

DOI

10.1155/2014/271926

Abstract

An approach of using the signal flow graph (SFG) technique to synthesize general high-order all-pass and all-pole current transfer functions with current follower transconductance amplifiers (CFTAs) and grounded capacitors has been presented. For general nth-order systems, the realized all-pass structure contains at most n + 1 CFTAs and n grounded capacitors, while the all-pole lowpass circuit requires only n CFTAs and n grounded capacitors. The resulting circuits obtained from the synthesis procedure are resistor-less structures and especially suitable for integration. They also exhibit low-input and high-output impedances and also convenient electronic controllability through the g m -value of the CFTA. Simulation results using real transistor model parameters ALA400 are also included to confirm the theory. © 2014 Worapong Tangsrirat.

Citation

Scientific World Journal, 2014, 2014