Patent ID: 7532063
Filing Date: 2009-05-12
Classification: G05F,G11C

Abstract:
1. An apparatus for generating a reference voltage in a semiconductor memory apparatus, comprising: a first voltage generating unit configured to generate a voltage proportional to temperature; a second voltage generating unit configured to generate a voltage inversely proportional to temperature; a reference voltage generating unit including a first adjusting unit coupled with the first voltage generating unit and a second adjusting unit coupled with the second voltage generating unit, configured to select the first adjusting unit or the second adjusting unit according to a difference between a reference voltage obtained by the first voltage generating unit and the second voltage generating unit and a target voltage, and adjust the reference voltage thereby outputting a constant reference voltage regardless of a variation in temperature, wherein the reference voltage generating unit further comprises: a control unit configured to output selection signals for controlling the first adjusting unit and the second adjusting unit wherein the control unit includes: