Patent ID: 7071858

Claim:
A current-steering switch circuit, comprising: a main differential pair switch including a first transistor pair having respective first and second control nodes, first and second output nodes, and a tail current node; an auxiliary differential pair switch including a second transistor pair having respective first and second control nodes, first and second output nodes, and a tail current node; wherein the first and second control nodes of the main differential pair switch are coupled to the first and second control nodes, respectively, of the auxiliary differential pair switch; wherein the first and second output nodes of the main differential pair switch are cross-coupled to the second and first output nodes, respectively, of the auxiliary differential pair switch; whereby the first output node of the main differential pair switch and the second output node of the auxiliary differential pair switch form a first coupling node; whereby the second output node of the main differential pair switch and the first output node of the auxiliary differential pair switch form a second coupling node; a first tail current source, having a first current value, coupled to the main differential pair switch tail current node; a second tail current source, having a second current value that is lower than the first current value, coupled to the auxiliary differential pair switch tail current node; and a pair of cascode transistors coupled to the first and second coupling nodes, respectively, whereby the pair of cascode transistors regulate a voltage at the coupling nodes.