Single-ended high voltage input-capable comparator circuit

摘要

A single-ended comparator is disclosed herein. The comparator may be implemented with low-voltage semiconductor devices that are capable of operating with high-voltage signals at an input. The single-ended comparator may be integrated in a larger circuit to receive and detect information provided on the input at voltage levels higher than the levels supported by the rest of the circuit, and transfer the information in the received signal for use by the rest of the circuit.

主权项

1. An apparatus, comprising:
an input node configured to receive input voltages within an input voltage range, the input voltage range comprising a first range and a second range; a voltage-limited output node; a first semiconductor device configured to couple the input node and the voltage-limited output node when an input voltage at the input node is within the first range of the input voltage range; a second semiconductor device configured to couple the voltage-limited output node to a power supply voltage source comprising a power supply voltage level when the input voltage at the input node is within the second range of the input voltage range, wherein the input voltage range is greater than an operating range of either the first or second semiconductor device, and wherein a maximum voltage of the input voltage range is greater than the power supply voltage level; and a single-ended voltage detection circuit coupled to the voltage-limited output node, wherein the single-ended voltage detection circuit comprises hysteresis generation circuitry.