A compression and decompression system in which a reversible wavelet filter are used to generates coefficients from input data, such as image data. A first seal is provided outside the at least one opening. The sensing region includes a central portion. The output terminals of the first and second amplification units output first and second output signals, and are connected to the input terminals of a differential amplifier circuit through coupling capacitors, respectively. In addition, each cell contains a layout of transistors that can be variably coupled to achieve a memory device, such as a SRAM device.