| 摘要 |
There is disclosed an integrated circuit including a sense amplifier. The sense amplifier is capable of encoding 2n levels of output characteristic into a bit pattern of n corresponding bits. The sense amplifier includes a non-zero detect circuit for detecting when the output characteristic is zero. The sense amplifier also includes 2n-2 comparators for comparing an output characteristic to 2n-2 reference levels when the output characteristic is non-zero. The 2n-2 reference levels are constructed from 2n-2 non-zero levels of the 2n possible levels of output characteristic. An encoder is coupled to the non-zero detect circuit and the comparators. The encoder encodes the output from the non-zero detect circuit and the outputs from the comparators to corresponding predetermined bit patterns. When the output characteristic is determined to be zero by the non-zero detect circuit, the bit pattern output is a default bit pattern. When the output characteristic is non-zero, the bit pattern takes on predetermined values determined by which pair of reference levels the output falls between, or whether the output characteristic is greater than the largest reference level or less than the smallest reference level.
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