Patent ID: 9024674
Filing Date: 2015-05-05
Classification: H03K

Abstract:
1. A level shifter comprising: a differential input stage comprising first and second transistors having respective first terminals, respective control terminals configured to receive a differential input signal, and respective second terminals connected in common to a first voltage; a breakdown voltage controller comprising third and fourth transistors having respective first terminals, respective second terminals connected to respective first terminals of the first and second transistors, and respective control terminals configured to receive a bias signal; and a load stage comprising fifth and sixth transistors having respective first terminals connected to respective first terminals of the third and fourth transistors, respective control terminals that are cross coupled, and respective second terminals connected to a second voltage, wherein a bias voltage applied to a bulk of each of the first and second transistors is a third voltage, the first voltage is a ground voltage, the second and third voltages are first and second negative voltages, respectively, and the third voltage has a lower absolute value than the second voltage.