New Electronically Tunable Third Order Filters and Dual Mode Sinusoidal Oscillator Using VDTAs and Grounded Capacitors

Tapas Kumar Paul; Radha Raman Pal

doi:10.46604/aiti.2021.7592

Authors

Tapas Kumar Paul Department of Physics, Vidyasagar University, Midnapore, West Bengal, India
Radha Raman Pal Department of Physics, Vidyasagar University, Midnapore, West Bengal, India

DOI:

https://doi.org/10.46604/aiti.2021.7592

Keywords:

dual mode third order oscillator, third order filter, total harmonic distortion (THD), voltage difference transconductance amplifier (VDTA)

Abstract

This study introduces a third order filter and a third order oscillator configuration. Both the circuits use two voltage difference transconductance amplifiers (VDTAs) and three grounded capacitors. By selecting the input and output terminals properly, current mode and transimpedance mode low-pass and band-pass filters can be obtained without component matching conditions. The natural frequency (ω₀) can be tuned electronically. The oscillator circuit provides voltage and current outputs explicitly. The condition of oscillation (CO) and the frequency of oscillation (FO) can be adjusted orthogonally and electronically. The workability of the configurations is judged using TSMC CMOS 0.18 μm technology parameter as well as commercially available LM13700 integrated circuits (ICs). The simulation results show that: for ±0.9V power supply, the power consumption is 1.08 mW for both the configurations, while total harmonic distortions (THDs) are less than 2.06% and 2.17% for the filter and oscillator configurations, respectively.

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