Ultra low power servo-controlled single clock ramp generator with amplitude independent to clock frequency

Abstract

A low power servo-controlled single clock ramp generator () includes a fast switched comparator (), charge pump () and voltage-to-current converter () connected to provide a feedback control mechanism under control of a pulse comparison clock signal (pulse_comp) and a reset pulse clock signal (rst_pulse) that are generated from a single input clock signal (clkin) so that there are well defined time intervals between pulses in the pulse comparison clock signal and the reset pulse clock signal, thereby providing a ramp signal (Vramp_out) having a stable, frequency-independent amplitude that is not limited by the reference voltage.