Methods of Multiplexing Several Linear Signals into One Analog to Digital Converter

Some practical examples are given for circuits enabling simultaneous conversion of several correlated or noncorrelated parameters with one ADC. The analog memories (stretchers) used as buffers introduce a dispersion due to the nonideal stretcher, when noncorrelated parameters are converted. A method of calculation is given to evaluate the dispersion introduced by the circuit. In the case of an important dispersion a symmetrisation of the data around the correct value is proposed so that the dispersion is reduced by a factor two.