Patent ID: 8860489
Filing Date: 2014-10-14
Classification: H03K

Abstract:
1. A voltage level shift circuit electrically coupled to a high supply voltage source VDDH, a low supply voltage source VDDL and a ground voltage source for use with multiple voltage integrated circuits, comprising: a first pair of transistors, each of said transistors of said first pair of transistors having first source or drain (S/D) terminals, second S/D terminals and gate terminals, the first S/D terminals electrically coupled to VDDH; a second pair of transistors, each of said transistors of said second pair of transistors having first S/D terminals, second S/D terminals and gate terminals, one of the first S/D terminals of the second pair of transistors electrically coupled to an input signal terminal, another of the first S/D terminals of the second pair of transistors electrically coupled to an inverted input signal terminal, the second S/D terminals of the second pair of transistors electrically cross-coupled to the gate terminals of the first pair of transistors, the gate terminals of the second pair of transistors electrically coupled to VDDL; and a third pair of transistors, each of said transistors of said third pair of transistors having first S/D terminals, second S/D terminals and gate terminals, the first S/D terminals of the third pair of transistors electrically coupled to the second S/D terminals of the first pair of transistors and the second S/D terminals of the second pair of transistors, the second S/D terminals of the third pair of transistors electrically coupled to VDDL, one of the first S/D terminals of the third pair of transistors is directly electrically connected to an output signal terminal and another of the first S/D terminals of the third pair of transistors is directly electrically connected to an inverted output signal terminal.