US Patent 11496701 Digital pixel comparator with bloom transistor frontend

An apparatus includes a bloom transistor frontend configured to receive an integrator output voltage and generate a comparator input voltage. The apparatus also includes a comparator configured to generate an output signal based on whether the comparator input voltage meets or exceeds a reference voltage. The bloom transistor frontend includes a first transistor configured to charge an input capacitance associated with the comparator in order to change the comparator input voltage. The bloom transistor frontend also includes a second transistor configured to discharge the input capacitance associated with the comparator in order to reset the comparator input voltage.