R & D Patent Attorneys
Low-cost, capacitive-coupled level shifter scalable for high-voltage applications
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.
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Wenwei
Wang