A universal self-contained proximity sensor for attachment to any night-vision device that does not have such a sensor or for replacement of the existing sensor. A method of reading and writing the digital state of an individual cell, row of cells, or column of cells by manipulating these row-supply or column-supply lines. The DDR SDRAM can, therefore, enter the test mode even if it is incorporated into a registered DIMM. The marked packet can then be transmitted. The analog DEM shuffler shuffles a set of analog threshold levels of the quantizer to yield a set of partially shuffled digital data at an output of the quantizer.