Band-gap reference self-starting circuit and a passive radio frequency identification tag
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United States of America Patent
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Nov 24, 2015
Grant Date -
Mar 12, 2015
app pub date -
Apr 8, 2013
filing date -
Apr 9, 2012
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Abstract
The present invention relates to the field of radio frequency, and provides a band-gap reference self-starting circuit and a passive radio frequency identification tag. The self-starting circuit comprises: a first switch device unit, configured to generate a first leakage current in an off state; a second switch device unit, configured to generate a second leakage current lower than the first leakage current in the off state, and generate a control voltage according to the first leakage current and the second leakage current; a control unit, configured to generate a starting control signal according to the control voltage; and a band-gap reference generating unit, configured to generate a reference voltage according to the starting control signal, and control the second switch device unit to enter dormancy using the reference voltage. The present invention boosts the control voltage using the leakage current generated by a field effect transistor in the off state, thereby implementing self-starting and generating the reference voltage, and controls the starting control unit to enter dormancy after the reference voltage is generated, thereby reducing system power consumption.
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