TITLE:
VDTA Based Electronically Tunable Voltage-Mode and Trans-Admittance Biquad Filter
AUTHORS:
Gunjan Gupta, Sajai Vir Singh, Sunil Vidya Bhooshan
KEYWORDS:
VDTA, Biquad Filter, Voltage-Mode, Trans-Admittance-Mode
JOURNAL NAME:
Circuits and Systems,
Vol.6 No.3,
March
27,
2015
ABSTRACT: In this
paper, a biquad filter configuration based on two voltage differencing
transconductance amplifiers (VDTAs) as newly active elements and only two
capacitors as passive elements is proposed which can realize voltage-mode low
pass (LP), band pass (BP), high pass (HP), band reject (BR) and all pass (AP)
filtering responses using three voltage inputs. Simultaneously, the same
configuration can also be used to obtain LP, BP and HP filtering responses in
transadmittance-mode. The proposed biquad is capable of providing electronic
control of quality factor independent of pole frequency through single
transconductance parameter (biasing current). It also offers the advantage of
low active and passive sensitivity. To support the theoretical analysis, the
PSPICE simulation of the proposed circuit is done using 0.18 μm CMOS technology
from TSMC.