| 摘要 |
In a semiconductor memory device including ROM cells, a digit line for receiving read data from a selected one of the at the memory cells, and a bias circuit for amplifying a voltage at the digit line, a differential amplifier, which has a positive phase input, a negative phase input, a positive phase output and a negative phase output, is provided. The positive phase input is connected to the output of the bias circuit. The negative phase output is connected to the negative phase input, thereby establishing a positive feedback loop in the differential amplifier.
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