Volatge level shifting apparatus

A voltage level shifting apparatus, comprising:

• a cross-coupled transistor pair, coupled to an operational voltage;
• a plurality of transistor pairs, one of which being coupled to the cross-coupled transistor pair, the gates of transistors of each of the transistor pairs being coupled to each other, and the transistor pairs being controlled by a plurality of reference voltages;
• a first diode string;
• a second diode string, the first diode string and the second diode string coupled between two of the transistor pairs, and each of the first diode string and the second diode string having at least a diode;
• and
• an input transistor pair, coupled between a ground voltage and the transistor pairs in serial, gates of transistors of the input transistor pair receiving a first input voltage and a second input voltage, and the first input voltage and a second input voltage being complementary signals;
• wherein the cross-coupled transistor pair has a first output end and a second output end, and the cross-coupled transistor pair shifts the first input voltage and the second input voltage according to the operational voltage to generate and output a first output voltage and a second output voltage through the first output end and the second output end respectively.