Patent ID: 6124743
Filing Date: 2000-09-26
Classification: H03K

Abstract:
A reference voltage generation circuit for a comparator having an operational amplifier connected between a power supply voltage and a ground voltage, an inverting terminal of the operational amplifier receives an input voltage and a non-inverting terminal of which receives a reference voltage, comprising:a first sample/hold unit for sampling and holding a periodic output voltage in accordance with a first clock signal;a second sample/hold unit for sampling and holding an output voltage from said first sample/hold unit in accordance with a second clock signal;a non-linear unit for outputting a non-linear voltage having a sawtooth-shaped transfer characteristic in accordance with an output voltage from said second sample/hold unit; andan addition unit for adding the non-linear voltage signal from said non-linear unit and an externally applied voltage and outputting the periodic output voltage to said first sample/hold unit and as the reference voltage to the operational amplifier of the comparator.