Patent ID: 7514965
Filing Date: 2009-04-07
Classification: H03K

Abstract:
1. A voltage comparator circuit comprising: a differential amplifier circuit receiving a pair of input signals to develop an output signal on an output terminal; and a waveform shaping circuit achieving waveform shaping of said output signal received from said differential amplifier circuit, wherein said differential amplifier circuit includes: wherein a resultant current which is said second and fourth internal currents added together is drawn from or supplied to said output terminal of said differential amplifier circuit, wherein said first differential transistor pair comprises first and second MOS transistors of a first conductive type, wherein said second differential transistor pair comprises third and fourth MOS transistors of a second conductive type complementary to said first conductive type, wherein said differential amplifier circuit further includes: wherein a drain of said first MOS transistor is connected to an input of said first current mirror circuit, wherein a drain of said second MOS transistor is connected to an input of said second current mirror circuit, wherein a drain of said third MOS transistor is connected to an input of said third current mirror circuit, wherein a drain of said fourth MOS transistor is connected to an input of said fourth current mirror circuit, wherein gates of said first and third MOS transistors are commonly connected to one of input terminals of said differential amplifier circuit, wherein gates of said second and fourth MOS transistors are commonly connected to another of said input terminals of said differential amplifier circuit, wherein each of said first to fourth current mirror circuits includes: