Low power ramp generator for use in single slope A/D

摘要

An apparatus comprising a charge pump configured to receive an input signal and to output incrementally a fixed amount of voltage for every selected edge of the input signal, an analog buffer coupled to said charge pump, the analog buffer feeding back a second voltage to said charge pump, the output of the charge pump linearly increases as a function of the fixed amount of voltage. A low power ramp generator that is created thereby may be used in analog to digital converters which are employed in devices such as imaging systems.