An Ultralow-Power 0.5-V MI-OTA-Based Universal Filter for Efficient Low-Frequency Signal Processing

Simple item page
dc.contributor.authorKulej, Tomasz
dc.contributor.authorKumngern, Montree
dc.contributor.authorKhateb, Fabian
dc.contributor.authorLerkvaranyu, Somkiat
dc.date.accessioned2026-08-06T10:54:10Z
dc.date.available2026-08-06T10:54:10Z
dc.date.issued2026-01-01
dc.description.abstractThis work introduces novel universal filters implemented using multiple-input operational transconductance amplifiers (MI-OTAs). The MI-OTA is specifically designed for a minimal 0.5-V supply, achieving nano-watt level power dissipation, which positions the design as highly viable for demanding ultralow-power systems. The architecture employs a subthreshold, multiple-input, bulk-driven MOS configuration. This design not only extends the operational input voltage range but concurrently ensures minimal voltage and power consumption. The primary filter topology utilizes five MI-OTAs and two grounded capacitors to concurrently deliver all five standard filtering responses—low-pass, high-pass, band-pass, band-stop, and all-pass filter—from a single, fixed circuit structure. By integrating a sixth MI-OTA, the architecture becomes reconfigurable for operation in both voltage-mode (VM) and transimpedance-mode (TIM). This versatility yields both non-inverting and inverting transfer functions for all five fundamental responses, resulting in a total of 20 distinct output functions. This multifunctionality and power efficiency make the proposed designs exceptionally well-suited for low-frequency applications, such as bio-signal processing and sophisticated sensor interfacing circuits. Furthermore, a key feature is that the filter's natural frequency is electronically tunable across all responses. The MI-OTA was designed and simulated in Cadence Virtuoso, utilizing the TSMC 65-nm (1P9M) CMOS process. The device occupies a modest silicon footprint of 125 μm × 92 μm. Simulation results confirm a power dissipation of 150 nW at a 177-Hz cutoff frequency under the 0.5-V supply. Post-layout simulations verified the expected circuit performance. Finally, experimental validation was conducted using a discrete-component MI-OTA-based circuit built with the LM13700, thereby confirming the filter's correct operation.
dc.identifier.citationInternational Journal of Circuit Theory and Applications, 2026
dc.identifier.doi10.1002/cta.70332
dc.identifier.issn00989886
dc.identifier.other2-s2.0-105028304952
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/17760
dc.sourceInternational Journal of Circuit Theory and Applications
dc.subjectbulk-driven MOS transistor
dc.subjectmultiple-input MOS transistor
dc.subjectoperational transconductance amplifier
dc.subjectuniversal filter
dc.titleAn Ultralow-Power 0.5-V MI-OTA-Based Universal Filter for Efficient Low-Frequency Signal Processing
dc.typeArticle

Files

Collections

Research