| 摘要 |
A comparator circuit comprising an operational amplifier for comparing a reference input signal at a given voltage and an input signal at an unknown voltage to produce a signal representing the result of the comparison, a first constant current source for feeding a constant current to the operational amplifier, an output transistor, having its base connected to the output of the operational amplifier, for controlling the output of the circuit, and a second constant current source for feeding a constant current to the base of the output transistor. This configuration enables the comparator circuit to operate normally, even when the input voltage is less than the reference voltage and is equal to zero.
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