This ensures that during read determination operation in the next read cycle, the potential of a selected bit line will not vary with the bit line residual discharge in the previous read cycle.

After a capacitor is disconnected from a discharge circuit, a residual charge remains on the capacitor, so a voltage is re-established across the capacitor terminals.

Calculation shows that method of minimum residual error is better method to establishment of the discharge drawdown equations, and minicomputer can use simply in calculating process.