Patent ID: 7489559

Claim:
A signal-selection circuit, comprising: first and second input nodes operable to respectively receive first and second signals respectively having first and second levels; an output node operable to provide the one of the first and second signals having a predetermined relationship to the other of the first and second signals; first and second switches serially coupled between the first input node and the output node and each having a respective control node, the first switch closest to the first input node, the control node of the first switch operable to receive a third signal having a third level that is between the first and second levels; third and fourth switches serially coupled between the second input node and the output node and each having a respective control node, the third switch closest to the second input node, the control node of the third switch operable to receive a fourth signal having a fourth level that is between the first and second levels; a first comparator operable to couple to the control node of the second switch the one of the second and third signals having the predetermined relationship to the other of the second and third signals; and a second comparator operable to couple to the control node of the fourth switch the one of the first and fourth signals having the predetermined relationship to the other of the first and fourth signals.