Switched-Capacitor phase shifter and topology application for other functions

This paper presents new analog circuits realised using switched-capacitor technique. New phase-shifter, low-pass filter and integrator circuits are proposed employing only a single positive type current conveyor, and switched capacitor resistor(s). The circuit operation for wide frequency range is verified through simulations. The use of simplified block employing only eleven transistors makes the new proposed circuit simpler in terms of the number of transistors. The proposed topology is studied for non-ideal and parasitic concerns, with minimal effect on circuit performance. The use of parasitic insensitive switched capacitor resistor(s) further makes the realised circuit a practical reality. Low-voltage operation in form of ±0.75 V makes the circuit easily adaptable for portable applications. Exhaustive simulations are carried out using 0.25-micron and 0.18-micron process parameters to confirm circuits’ functionality. The possibility of using off-the-shelf components for testing the circuits is mentioned for subject’s enthusiasts. The new circuits by being CMOS compatible provide knowledge enrichment on analog sample data systems. ©, Engineers Australia.