Patent ID: 8258848
Filing Date: 2012-09-04
Classification: H03K

Abstract:
1. A level shifting circuit comprising: a circuit input that swings between a low voltage supply and ground; a circuit output that swings between a high voltage supply and the ground; an inverter with an inverter input connected to the circuit input and an inverter output forming an inverted circuit input; a first NMOS transistor with gate connected to the inverted circuit input, with source connected to the ground, and with drain connected to the circuit output; a second NMOS transistor with gate connected to the circuit input and with source connected to the ground; a first PMOS transistor with gate connected to the second NMOS transistor drain and with source connected to the high voltage supply; a second PMOS transistor with gate connected to the circuit output and with source connected to the high voltage supply; a third PMOS transistor, the third PMOS transistor being of the multiple independent gate type, with source connected to the drain of the first PMOS transistor, with drain and back-gate connected to the circuit output, and with front-gate connected to the inverted circuit input; and a fourth PMOS transistor, the fourth PMOS transistor being of the multiple independent gate type, with source connected to the drain of the second PMOS transistor, with drain and back-gate connected to the second NMOS transistor drain, and with front-gate connected to the circuit input.