A Novel Circuit Topology for the Implementation of a 2nd order Chebyshev Type-II Low Pass Filter with Independent Frequency and Gain Tuning
A novel implementation circuit for a Chebyshev type-II filter transfer function is presented in this brief. Chebyshev type-II filters provide steeper roll-off with a flat passband. Most discrete and IC implementations of filters do not allow for zeroes in the transfer functions and hence cannot implement such a filter transfer function. The mathematical formulation for the proposed circuit is fully developed to show the implementation of a Chebyshev type-II transfer function. The notable features of the proposed circuit include independent tuning of gain and bandwidth by varying a minimal number of passive components. The filter is implemented with discrete components and the functionality with independent bandwidth and gain tuning are demonstrated experimentally. Bandwidth tuning is achieved by varying 2 resistors and gain tuning is achieved by varying 1 resistor. A fully differential implementation for ICs is also developed. The proposed topology easily lends itself for cascading to obtain higher order filters.
Science and Engineering Research Board (SERB)
Department of Science and Technology (DST), Government of India
Email Address of Submitting Authorprathamesh962001@gmail.com
ORCID of Submitting Author0009-0004-0797-8746
Submitting Author's InstitutionIndian Institute of Space Science and Technology
Submitting Author's Country