A 3 bits Discrete Pure Linear Analog Preprocessing Folding ADC Architecture Based on Cascade Controlled Channels

A very simple circuit for a 3-bits discrete pure linear analog preprocessing folding ADC is presented. The device is based on the folding idea: the DAC, the summing node and the amplifier, fundamental elements of the classical architecture, are eliminated and replaced with an analogical signal preprocessing parallel structure named “channels”. All channels are connected as a cascade and only three transistors constitute each one. The circuit has been widely analyzed by simulation and its simplicity guarantees easiness of realization, reduction of power consumption and reduction of total conversion time, making it close to the ADC flash. A first discrete circuit it has been realized and teste