AN ACCURATE CMOS DIFFERENTIAL VOLTAGE-TO-CURRENT CONVERTER

A technique for implementing a differential voltage-to-current convert er that is suitable for fabrication in CMOS technology is presented. T he transconductance of the converter is determined by an external resi stor. Very linear and accurate transconductance is obtained with a con version error of 0.012% for an external resistance of 25 Omega. Simula tion results are given to show the linearity and accuracy of the conve rsion circuit. The voltage-to-current converter is a versatile buildin g block and can be applied as a current conveyor, a floating inductanc e, a floating negative impedance converter and an instrumentation ampl ifier.