Transient blocking unit having shunt for over-voltage protection
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United States of America Patent
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Issued Date -
Jul 20, 2006
app pub date -
Jan 12, 2006
filing date -
Jan 14, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A transient blocking unit (TBU) having improved damage resistance is provided. A TBU includes two or more depletion mode transistors arranged to provide a low series impedance in normal operation and a high series impedance when the input current exceeds a predetermined threshold. At least one of the TBU transistors is a protecting device having a shunt circuit element connected in parallel with its channel. When the TBU is in its high impedance state, the shunt circuit element provides a current path, thereby decreasing terminal voltages on at least one of the TBU transistors. The shunt element can be a discrete or integrated resistor, a current source including a transistor, or an appropriately engineered device parasitic.
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