Abstract

In this paper, a voltage-mode first-order all-pass filter using three passive components (one capacitor, two resistors) and one active building block (second-generation voltage conveyor) is presented. The proposed design's ideal and non-ideal behaviors are examined to ensure it functions in real-world environments. The effects of variations in capacitance and temperature on the performance of the proposed structure are also analyzed and verified through Monte Carlo simulations. The proposed device gains a patented feature of tunability when NMOS transistors replace two passive resistors with an active equivalent design. Moreover, a second-order all-pass filter is included to test the design's practical viability. The circuit validation is conducted using 0.18 μm CMOS process parameters with a ±0.9 V power supply, using the PSPICE simulation tool, and also validated by experimental setup using IC AD844.

Keywords: All-pass filter, first-order, Monte Carlo simulation, tunability, VCII, voltage-mode.