Abstract
A new voltage mode, carbon nanotube field-effect transistor (CNTFET) based multiple input single output active only biquadratic filter (AOBF), is presented. The proposed AOBF employs simple and compact single ended transconductance elements, voltage-controlled resistor (VCR) and varactor. The proposed AOBF provides band-pass filter, band-reject filter, all-pass filter, high-pass filter and low-pass filter responses, just by selecting the appropriate inputs. The AOBF operates at low-voltage supply of 0.7 V and suitable for integration due to absence of any external passive component. The realized AOBF also enjoys the attractive features of orthogonal voltage-controlled tuning of its pole-Q and pole-omega(o), low incremental sensitivity performance and suitability for multi-GHz frequency applications. The pole-Q of the filter is controlled through CNTFET-based VCR while the pole-omega(o) is controlled through the CNTFET-based varactor. To validate the performance, HSPICE simulation on the designed AOBF was carried out using Stanford CNTFET model at 16 nm technology node. The simulation results thus obtained, justify the theory proposed.