| 摘要 |
A voltage comparator circuit is composed of a differential amplifier circuit receiving a pair of input signals to develop an output signal on an output terminal, and a waveform shaping circuit connected to the output terminal. The differential amplifier circuit includes: a first differential transistor pair responsive to the pair of input signals to output first and second output currents; a second differential transistor pair responsive to the pair of input signals to output third and fourth output currents; a first current mirror circuit developing a first internal current in response to the first output current; a third current mirror circuit complementary to the first current mirror circuit and developing a third internal current in response to the third output current; a second current mirror circuit developing a second internal current in response to the third output current and the third internal current; and a fourth current mirror circuit complementary to the second current mirror circuit and developing a fourth internal current in response to the fourth output current and the first internal current. A resultant current which is said second and fourth currents added together is drawn from or supplied to the output terminal of the differential amplifier circuit.
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