| 摘要 |
A comparator according to the present invention can generate an output signal of low or high level by comparing a first and second input voltages that have a common voltage. An input stage circuit of a comparator according to the present invention receives a common voltage detection signal. The common voltage is supplied with a first offset voltage when the common voltage detection signal is on low level, and the common voltage is supplied with a second offset voltage when the common voltage detection signal is on high level. Then, the input stage circuit performs amplification to output a voltage difference between the first input voltage and the second input voltage to the comparator. Accordingly, the comparator with offset voltage according to the present invention can sufficiently amplify the input signal difference of low common voltage by selectively applying different offset voltages to a common voltage in accordance with the common voltage level of the input signal. The present invention can be applied to a comparator with offset voltage and an analogue comparator having a differential input stage.
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