Level shifter for noise and leakage suppression

摘要

A level shifter circuit is disclosed that gates at least one of a plurality of input terminals of a level shifter to at least one of a plurality of supply voltages that are associated with respective supply voltage domains when the at least one of the plurality of supply voltages is powered down. The level shifter is therefore insensitive to noise on the input terminals and also reduces leakage current associated with noise induced crowbar currents.

主权项

1. A level shifter circuit comprising:
an input stage comprising input terminals configured to couple with a first voltage domain; and an output stage configured to produce complementary output signals for a second voltage domain that are based on complementary input signals, wherein the input stage comprises circuitry configured to gate input signals of the input terminals in response to a powering down of the first voltage domain and a pair of cross coupled inverters configured to maintain the last state of the input signals responsive to the powering down of the first voltage domain, wherein the pair of cross coupled inverters comprise transistors that are coupled to ground.