A sampling circuit which is capable of a full ranging output when powered with very low voltage supplies, e.g., of about 1 volt. A current copier function is added to a sample and hold circuit to avoid the need for low threshold switching devices in the sampling circuit, thus avoiding output droop due...http://www.google.fr/patents/US5973518?utm_source=gb-gplus-shareBrevet US5973518 - Low voltage sample and hold circuit
