Patent ID: 6930550

Claim:
A self-biased differential buffer comprising: a first input; a second input; a first current source transistor that drives a first current to a first upper branch node; a first upper drive transistor having a gate receiving the first input, and a drain driving a first output, for conducting a first drive portion of the first current; a first upper bias-generating transistor, having a gate receiving the first input, and a drain driving a first bias-generating node, for conducting a first bias-generating portion of the first current; a first lower drive transistor having a gate receiving the first input, and a drain driving the first output, for conducting to a first lower branch node; a first lower bias-generating transistor, having a gate receiving the first input, and a drain driving the first bias-generating node, for conducting to the first lower branch node; a first current sink transistor that sinks current from the first lower branch node; a first transmission gate between the first bias-generating node and a bias node; a second current source transistor that drives a second current to a second upper branch node; a second upper drive transistor having a gate receiving the second input, and a drain driving a second output, for conducting a second drive portion of the second current; a second upper bias-generating transistor, having a gate receiving the second input, and a drain driving a second bias-generating node, for conducting a second bias-generating portion of the second current; a second lower drive transistor having a gate receiving the second input, and a drain driving the second output, for conducting to a second lower branch node; a second lower bias-generating transistor, having a gate receiving the second input, and a drain driving the second bias-generating node, for conducting to the second lower branch node; a second current sink transistor that sinks current from the second lower branch node; and a second transmission gate between the second bias-generating node and the bias node.