Patent ID: 8975923
Filing Date: 2015-03-10
Classification: G06F,H03K

Abstract:
1. A protective multiplexer circuit, having a first state and a second state, configured to provide an input reference voltage at an input of a power supply of a passgate, the passgate having first and second signal nodes and a control node, the control node configured to receive a control voltage from the power supply, the control voltage referenced to the input of the power supply, the protective multiplexer circuit comprising: a first switch, in the first state, configured to couple the input of the power supply to at least one of the first or second signal nodes when a first voltage of the at least one of the first or second signal nodes is below a first limit voltage; and wherein the first switch, in the first state, is configured to provide a second limit voltage as the input reference voltage when the first voltage is above the first limit voltage, wherein the second limit voltage is the first limit voltage less a turn-on voltage of the first switch.