Reference disturbance mitigation in successive approximation register analog to digital converter

A successive approximation register analog to digital converter for use at an analog output, the successive approximation register analog to digital converter comprising:

• a comparator;
• a capacitor array coupled to an input of the comparator;
• and
• a switch array configured to be activated to couple a current bit capacitor of the capacitor array to a rough reference connection while a current bit corresponding to the current bit capacitor is determined by the comparator, and to couple a previous bit capacitor of the capacitor array to a fine reference connection while the current bit capacitor is coupled to the rough reference connection.

A semiconductor die assembly comprising:

• a comparator mounted on a semiconductor die;
• a capacitor array, the capacitor array mounted on the semiconductor die;
• a switch array mounted on the semiconductor die;
• and
• a successive approximation register sequencer configured to activate the switch array to couple a current bit capacitor of the capacitor array to a rough reference connection while a current bit corresponding to the current bit capacitor is determined by the comparator, and further configured to activate the switch array to couple a previous bit capacitor of the capacitor array to a fine reference connection while the current bit capacitor is coupled to the rough reference connection, the successive approximation register sequencer mounted on the semiconductor die.

An analog to digital converter circuit assembly comprising:

• a comparator;
• a capacitor array;
• a switch array configured to selectively couple the capacitor array to an analog signal input and to reference connections;
• and
• a successive approximation register sequencer configured to activate the switch array to couple a current bit capacitor of the capacitor array to a rough reference connection while a current bit corresponding to the current bit capacitor is determined by the comparator, and further configured to activate the switch array to couple a previous bit capacitor of the capacitor array to a fine reference connection while the current bit capacitor is coupled to the rough reference connection.