Time-to-Voltage Converters Based on the Time-Sharing Principle

The authors offer a new approach to the creation of linear and nonlinear pulse width modulated (PWM) signal demodulators. The proposed approach is based on the time-sharing principle in feedback and feedforward circuits. The demodulators are characterized by ease of manufacturing due to the decreased need for analog element precision. The following circuits have been designed and presented: a PWM signal demodulator performing linear conversion of a PWM signal into voltage; calculating demodulators with the function of sum of products and simple fraction; and a demodulator with a fractional rational function. All these circuits are based on the principle of continuous signal averaging by the active Miller integrator with the storing of the intermediate result in an analog memory cell. The designed demodulators are investigated during modeling and full-scale experiments. The reviewed set of demodulators can be enlarged by adding similar circuits to the proposed structures with a larger number of inputs and new functional possibilities. The proposed solutions follow the modularity principle and can be used in fully integrated implementations.