A current comparator and comparison method for correction of current steering digital-to-analog converter
A current comparator, analog converter technology, applied in analog/digital conversion calibration/test, analog/digital conversion, code conversion and other directions, can solve problems such as current mismatch, achieve the effect of simple circuit and accurate comparison results
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[0018] The present invention is characterized in that the difference of the current signal is converted into the difference of the voltage signal, taking 4 current sources that need to be compared as an example, which contains:
[0019] Reference current source I ref , the first current source I 1 , the second current source I 2 , the third current source I 3 , the fourth current source I 4 , the first switch K 0 , the second switch K 1 , the third switch K 2 , the fourth switch K 3 , the fifth switch K 4 , resistor R, capacitor C and voltage comparator;
[0020] Reference current source I ref The positive pole is connected to the voltage source, the negative pole is connected to the left plate of the capacitor C; the current source I 1 The negative pole is grounded, and the positive pole is connected to the switch K 1 One end of the switch K 1 The other end of the capacitor C is connected to the left plate; the current source I 2 The negative pole is grounded, an...
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