Bandgap reference circuit and regulator circuit with common amplifier
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United States of America Patent
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May 12, 2015
Grant Date -
Jan 16, 2014
app pub date -
Jul 12, 2012
filing date -
Jul 12, 2012
priority date (Note) -
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Abstract
A bandgap voltage reference and voltage regulator system includes a bandgap voltage reference circuit and a voltage regulator circuit that share a single, common amplifier. The amplifier acts as a gain stage for the reference circuit and as an error amplifier for a driver stage of the regulator circuit. The regulator circuit has an input reference generated by the reference circuit, and the reference circuit acts as a load to the driver stage, obviating the need for a bias resistance network. By sharing the amplifier and obviating the need for a resistance network, the area and overall quiescent current of the system are reduced. The system can be implemented in CMOS/BiCMOS technology and is suited for low power applications.
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