A low-current input buffer is disclosed. The buffer uses self-biased N and P channel differential pairs with their outputs tied together. The self-biasing assists in reducing current consumption. The combination of N and P-channel differential pairs results in symmetry across a wide range of reference...http://www.google.es/patents/US7236019?utm_source=gb-gplus-sharePatente US7236019 - Low current wide VREF range input buffer
