Patent ID: 7583108

Claim:
A current comparator, comprising: an input node for receiving an input current; an output node; a first wide swing current mirror comprising: an input coupled to the input node of the current comparator, a power node for receiving a first power supply voltage, and an output coupled to the output node of the current comparator, wherein the first wide swing current mirror comprises a first N-channel transistor directly coupled to the first power supply voltage, a gate directly coupled to the input node of the current comparator, and a drain; a second N-channel transistor directly coupled to the first power supply voltage, a gate coupled to the gate of the first N-channel transistor, and a drain; a third N-channel transistor having a source directly coupled to the drain of the first N-channel transistor, a gate coupled to a bias node, and a drain coupled to the input node of the current comparator; a fourth N-channel transistor having a source directly coupled to the drain of the second N-channel transistor, a gate coupled to the bias node, and a drain coupled to the output node of the current comparator; and a second wide swing current mirror formed using P-channel transistors comprising an input coupled to the input node of the current comparator, a power node for receiving a second power supply voltage, and an output coupled to the output node of the current comparator.