| 摘要 |
A level shifter for level-shifting a digital input signal referenced to an input ground potential to a digital output signal referenced to an output ground potential, comprising: a capacitor; a driver circuit, including an input node coupled to the digital input signal, and an output node coupled to a first terminal of the capacitor; a receiver circuit, including a first input node coupled to a second terminal of the capacitor, and an output node coupled to the digital output signal; and a latching feedback circuit, including a first input node coupled to the output node of the receiver circuit, and an output node coupled to the second terminal of the capacitor to latch a toggled signal. An optional resistor can be inserted to increase the output resistance of the latching feedback circuit to be substantially larger than the output resistance of the driver circuit. |
| 主权项 |
1. A level shifter for level-shifting a digital input signal referenced to an input ground potential to a digital output signal referenced to an output ground potential, wherein the output ground potential is higher than or equal to or lower than the input ground potential, comprising:
a driver circuit including an input node and an output node, powered by an input power supply referenced to the input ground potential, and configured as inverting or non-inverting, and wherein the input node is coupled to the digital input signal, and wherein the output node toggles when the digital input signal toggles; a capacitor including a first terminal and a second terminal, wherein the first terminal is coupled to the output node of the driver circuit, and wherein the second terminal toggles in sync with the toggling of the output node of the driver circuit; a first resistor including a first terminal and a second terminal, wherein the first terminal is coupled to the second terminal of the capacitor; a receiver circuit including a first input node and an output node, powered by an output power supply referenced to the output ground potential, and wherein the first input node is coupled to the second terminal of the capacitor, and wherein the output node is coupled to the digital output signal, and wherein the digital output signal toggles when the second terminal of the capacitor toggles; and a latching feedback circuit including a first input node and an output node, powered by the output power supply referenced to the output ground potential, and wherein the first input node is coupled to the output node of the receiver circuit, and wherein the output node is coupled to the second terminal of the first resistor, and wherein the sum of the output resistance of the latching feedback circuit and the resistance of the first resistor is larger than the output resistance of the driver circuit, and configured as non-inverting if the receiver circuit is non-inverting, or configured as inverting if the receiver circuit is inverting, thereby providing a positive feedback loop to latch a toggled signal from the second terminal of the capacitor to the receiver circuit. |
