Analysis of Bias Effects on the Total-Dose Response of a Bipolar Voltage Comparator

The impact of the bias condition during irradiation on the total-dose response of a bipolar voltage comparator is investigated. Experimental results obtained with input pins biased asymmetrically during irradiation exhibit completely different total-dose response compared to irradiation with all pins grounded. Circuit analysis shows that asymmetrical biasing of the input stage creates a mismatch of the gain degradation in the transistors constituting the differential pair