Level shifter
First Claim
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1. A level shifter, comprising:
- a first switch circuit having a first switch and a second switch, each having a first terminal, a second terminal and a third terminal, wherein the first terminals of the first and the second switches are connected to a high voltage node;
a second switch circuit having a third switch and a fourth switch, each having a fourth terminal, a fifth terminal and a sixth terminal, wherein the fourth terminal of the third switch is connected to the third terminal of the first switch and the second terminal of the second switch, the fourth terminal of the fourth switch is connected to the second terminal of the first switch and the third terminal of the second switch, the sixth terminals of the third and the fourth switches are connected to a low voltage node, the fifth terminal of the third switch receives an input control signal and the fifth terminal of the fourth switch receives an inverted input control signal; and
first and second triggers having a delay unit, an inverter and an AND gate respectively and connected across the third and the fourth switches for dynamically changing respective substrate voltages of the third and the fourth switches, thereby reducing respective threshold voltages of the third and the fourth switches and turning on respective parasitic bipolar junction transistors (BJTs) on the third and the fourth switches.
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Accused Products
Abstract
A level shifter has a pair of P-type MOS transistor switches, a pair of N-type MOS transistor switches, an inverter and a plurality of triggers. The triggers are connected to gates of high-voltage devices (N-type MOS transistor switches) and substrates of the high-voltage devices, so that the triggers can produce a trigger signal for a period of time after receiving a low voltage control signal in order to change voltages on the substrates at transition and further reduce threshold voltages of the substrates to increase transition speed of the shifter circuit.
5 Citations
26 Claims
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1. A level shifter, comprising:
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a first switch circuit having a first switch and a second switch, each having a first terminal, a second terminal and a third terminal, wherein the first terminals of the first and the second switches are connected to a high voltage node; a second switch circuit having a third switch and a fourth switch, each having a fourth terminal, a fifth terminal and a sixth terminal, wherein the fourth terminal of the third switch is connected to the third terminal of the first switch and the second terminal of the second switch, the fourth terminal of the fourth switch is connected to the second terminal of the first switch and the third terminal of the second switch, the sixth terminals of the third and the fourth switches are connected to a low voltage node, the fifth terminal of the third switch receives an input control signal and the fifth terminal of the fourth switch receives an inverted input control signal; and first and second triggers having a delay unit, an inverter and an AND gate respectively and connected across the third and the fourth switches for dynamically changing respective substrate voltages of the third and the fourth switches, thereby reducing respective threshold voltages of the third and the fourth switches and turning on respective parasitic bipolar junction transistors (BJTs) on the third and the fourth switches. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A level shifter, comprising:
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a first switch circuit having a plurality of first switches connected to a first voltage node; a second switch circuit having a plurality of second switches connected to a second voltage node, wherein when the first voltage node is a high voltage node and the second voltage node is a low voltage node, the second switch circuit is connected to a trigger having a delay unit, an inverter and an AND gate, the second switch circuit and the trigger receive a low voltage control signal respectively for the second switches to switch and further invoke the first switches to switch, the trigger produces a trigger signal for a predetermined interval such that substrate voltage of at least one second switch is changed when the first switch circuit and the second switch circuit are at transition, thereby reducing a threshold voltage of the at least one second switch and increasing circuit transition speed to output a high voltage control signal. - View Dependent Claims (11, 12, 13)
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14. A level shifter, comprising:
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a first switch circuit having a first switch and a second switch, each having a first terminal, a second terminal and a third terminal, wherein the first terminals of the first and the second switches are connected to a high voltage node; a second switch circuit having a third switch and a fourth switch, each having a fourth terminal, a fifth terminal and a sixth terminal, wherein the fourth terminal of the third switch is connected to the third terminal of the first switch and the second terminal of the second switch, the fourth terminal of the fourth switch is connected to the second terminal of the first switch and the third terminal of the second switch, the sixth terminals of the third and the fourth switches are connected to a low voltage node, the fifth terminal of the third switch receives an input control signal and the fifth terminal of the fourth switch receives an inverted input control signal; and first and second triggers which are respectively an RC delay circuit consisting of a resistor and a capacitor and connected across the third and the fourth switches for dynamically changing respective substrate voltages of the third and the fourth switches, thereby reducing respective threshold voltages of the third and the fourth switches and turning on respective parasitic bipolar junction transistors (BJTs) on the third and the fourth switches. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A level shifter, comprising:
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a first switch circuit having a plurality of first switches connected to a first voltage node; a second switch circuit having a plurality of second switches connected to a second voltage node, wherein when the first voltage node is a high voltage node and the second voltage node is a low voltage node, the second switch circuit is connected to a trigger which is an RC delay circuit consisting of a resistor and a capacitor, the second switch circuit and the trigger receive a low voltage control signal respectively for the second switches to switch and further invoke the first switches to switch, and the trigger produces a trigger signal for a predetermined interval such that substrate voltage of at least one second switch is changed when the first switch circuit and the second switch circuit are at transition, thereby reducing a threshold voltage of the at least one second switch and increasing circuit transition speed to output a high voltage control signal. - View Dependent Claims (24, 25, 26)
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Specification