A Novel Current Subtractor Based on Modified Wilson Current Mirror Using PMOS Transistors

The paper presents current subtractor circuit based on modified Wilson current mirror using PMOS transistors. Modified Wilson current provides negative feedback which stabilizes output current without any systematic error with a wide operating range. The proposed circuit can be used in various analog circuits such as operational amplifiers, operational transconductance amplifier, Gm-C filters, oscillators etc. The simulation is performed using Cadence Virtuoso in 180nm CMOS process technology with a power supply of 0.8V. The proposed circuit works efficiently in wide range of 0nA to 600uA with the percentage error less than 1.82%. It has low input resistance and high output resistance.