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US 6,747,502 B2Granted
Level shift circuit including a resistor configured to drive a high-withstand-voltage element
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorMasahiro Yamamoto
Life of this patent
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Abstract
In a level shift circuit for converting a level signal of several volts into a signal of a high level and transmitting the high-level signal, as a voltage reduction unit for reducing an overvoltage applied across the gate and the source of a high-withstand-voltage element used in a signal level conversion unit, a zener diode is connected between the gate and the source such that the anode of the zener diode is on the source side, so that an overcurrent is prevented from flowing in the high-withstand-voltage element.
Claims1
A level shift circuit comprising:
- a constant current source configured to reduce an overvoltage applied across the gate and the source of a high-withstand-voltage element used in the level shifter circuit,
- wherein:
- the constant current source is inserted between the gate and ground,
- a resistor is inserted between the drain of a P-channel MOS transistor of an inverter and the gate of the high-withstand-voltage element, and is configured to drive the high-withstand-voltage element, and
- a capacitor is connected in parallel to the resistor.
2 more elements
Dependencies are inferred from the claim text.