Patent ID: 8081012
Filing Date: 2011-12-20
Classification: H03K

Abstract:
1. A semiconductor buffer circuit comprising: a detecting block configured to provide a plurality of pull-up and pull-down code signals by detecting fluctuation of an external voltage; and a buffer unit configured to amplify and provide input signals by using the pull-up and pull-down code signals, wherein the buffer unit is controlled based on the pull-up and pull-down code signals such that driving capability according to fluctuation of the external voltage is compensated, wherein the detecting block comprises a plurality of detecting units each receiving the external voltage and a corresponding one of a plurality of reference voltages, and at least two of the plurality of reference voltages are different from one another, and wherein the buffer unit comprises: a pull-up transistor unit configured to receive the pull-up code signals; a pull-down transistor unit configured to receive the pull-down code signals; a plurality of transistors configured to detect a potential difference of the input signals; and a current-mirror unit configured to amplify a current in accordance with the potential difference.