CMOS multifunctional structure, with applications in analog signal processing

The paper will present an original multifunctional circuit that is able to implement (using the same functional core) a multitude of linear and nonlinear useful circuit functions: differential amplifiers and multiplier circuits with excellent linearity and extended range of the input amplitudes, squaring computational circuits, active resistors and function synthesizer structures with improved accuracy. The advantages of using this approach of designing analog signal processing structures are mainly related to the very important reducing of circuit complexity and accuracy for each developed circuit function. The circuits are designed for low-voltage low-power operations, being supplied at 0.7 V and consuming between 0.3uA and 0.9uA. They allow extremely large amplitude of the input signal (between −800mV and 800 mV), being able to obtain a very good accuracy of circuit functions implementations. The estimated theoretical results are confirmed by specific simulations, showing an excellent accuracy, correlated with a low-voltage low-power operation.