Method of improving differential linearity of ad converter

TLDR: In this article, an AD converter suitable for the radiant-ray measurement was used to measure radiant rays effectively by setting a voltage in switching lower than the circuit voltage when a signal pulse is at 0V.

Abstract: PURPOSE:To measure radiant rays effectively by setting a voltage in switching lower than the circuit voltage when a signal pulse is at 0V, in an AD converter suitable for the radiant-ray measurement CONSTITUTION:An input signal is led to linear gate 12 via input buffer 11 and the output of the gate is further inputted to synchronizer 19 by way of stretcher 13, peak detector 14 and clock gate 15 The other output of stretcher 13 is led via high speed/low speed change-over switch level detector 18 to synchronizer 19, whose outputs are supplied to channel scaler 20 to adjust the gain via conversion gain switch 21 Then, a digital value equivalent to an offset voltage is subtracted out of scaler 20 Thus, invariably excellent linearity is obtained without reference to the level of the voltage of the signal pulse, and the radiant-ray measurement is carried out effectively