Negative voltage generator
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United States of America Patent
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Jan 20, 2009
Grant Date -
Jan 24, 2008
app pub date -
Jul 18, 2006
filing date -
Jul 18, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A negative voltage generator includes a current mirror unit, a control unit, a resistor, and a switching unit. The current mirror unit receives a first positive voltage from a first positive voltage source and a second positive voltage from a second positive voltage source and determines how to generate a first output current and a second output current according to the difference of a received positive reference voltage and the second positive voltage. The control unit generates a control signal whose value depends on the voltage variation of a negative voltage generated by a negative voltage source, and the on/off state of the switching unit is determined according to the control signal to keep the current passing through the switching unit constant and to generate a first output negative voltage having a constant level.
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