Paper Title
Low-Power DTMOS VDDDA Design and its Multifunction Filter Application

Abstract
This work presents an enhanced Voltage Differencing Differential Difference Amplifier (VDDDA) topology that leverages Dynamic Threshold MOS (DTMOS), positive feedback, and resistance compensation techniques to significantly improve trans conductance, bandwidth, and ultra-low voltage operation at ±0.5V. The proposed VDDDA achieves a trans conductance of 1.064 mA/V and a substantially higher bandwidth of 224.230 MHz compared to conventional CMOS-based designs, making it highly suitable for analog signal processing applications. Additionally, a versatile multifunction filter is introduced, utilizing a single VDDDA, one resistor, and two grounded capacitors to support five distinct filtering responses: low-pass (LP), band-pass (BP), band-stop (BS), high-pass (HP), and all-pass (AP). The filter’s natural frequency and quality factor are electronically tunable, ensuring compatibility with microcomputer or microcontroller-based systems. Proposed Architecture is simulated using 0.18-µm CMOS process technology, the proposed circuit and filter applications are validated through simulations, demonstrating the effectiveness of proposed techniques in achieving enhanced performance, low-voltage operation, and improved functionality for modern analog systems. Keywords - VDDDA, Multifunctional filter, DTMOS, Dynamic threshold technique, Low -power, BP, HP, LP, AP, BS.