Generator for supplying reference voltage and reference current of stable level regardless of temperature variation
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United States of America Patent
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Jun 19, 2007
Grant Date -
Dec 1, 2005
app pub date -
May 6, 2005
filing date -
May 6, 2004
priority date (Note) -
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Abstract
A reference voltage and reference current generator supplies a reference voltage and a reference current, both having stable levels regardless of temperature variation. The reference voltage and reference current generator includes a reference voltage generating unit, a first current mirror, a temperature compensation MOS transistor and a second current mirror. The reference voltage generating unit outputs a reference voltage having a stable level regardless of temperature variation and process variation by using junction voltage characteristic and thermal voltage characteristic of a bipolar transistor, and supplies an inner current corresponding to the thermal voltage characteristic. The first current mirror supplies a first current by mirroring the inner current. The temperature compensation MOS transistor supplies a second current corresponding to the reference voltage through the source-drain stage. The second current mirror supplies a reference current corresponding to the sum of the first current and the second current.
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