A MOS-Only Compact and Wide-Range Voltage-Controlled Grounded Resistor
Munir A. Al-Absi, Abdulaziz Ahmed Al-Khulaifi · Journal of Circuits Systems and Computers · 2024
In many integrated circuit applications, where large passive resistors are prohibited, a tunable active resistor is necessary. This paper presents a compact and wide-range voltage-controlled grounded resistor that employs MOS transistors only. The design’s foundation is an active adjustable resistor that controls the NMOS transistor’s mode of operation. The proposed design is implemented using 0.18[Formula: see text]m TSMC CMOS technology and is validated through post-layout simulations conducted in the Cadence Virtuoso environment. Furthermore, a tunable high-pass filter utilizing the proposed active resistor is also shown. The circuit is powered by 1.5[Formula: see text]V DC. According to the simulation findings, the resistance varies between 33[Formula: see text]k [Formula: see text] and 36[Formula: see text]G [Formula: see text], for an input voltage range [Formula: see text]0.7–0.6[Formula: see text]v.