Balanced level shifter with wide operation range

A method, comprising:

• buffering an external signal at a first voltage level;
• inverting the external signal;
• delaying the inverted external signal;
• generating a first internal signal at a second voltage level and a second internal signal at the second voltage level dependent upon the buffered external signal and the delayed inverted external signal;
• buffering the second internal signal;
• inverting the first internal signal;
• delaying the inverted first internal signal, wherein delaying the inverted external signal comprises charging a first capacitor and discharging a second capacitor;
• and
• generating an output signal at the second voltage level dependent upon the buffered second internal signal and the delayed inverted first internal signal.

A system, comprising:

• a first circuit block coupled to a first power supply, wherein the first circuit block is configured to transmit a logic signal at the voltage level of the first power supply;
• a level shift circuit coupled to the first power supply and a second power supply, wherein the level shift circuit is configured to:
• receive the logic signal at the voltage level of the first power supply;
• buffer the logic signal;
• invert the logic signal;
• charge a capacitor coupled to the inverted logic signal to delay the inverted logic signal;
• generate a first internal signal at the voltage level of the second power supply and a second internal signal at the voltage level of the second power supply dependent upon the buffered logic signal and the delayed inverted logic signal;
• buffer the first internal signal;
• invert the second internal signal;
• delay the inverted second internal signal;
• generate an output signal at the voltage level of the second power supply dependent upon the buffered first internal signal and the delayed inverted second internal signal;
• and
• a second circuit block coupled to the second power supply, wherein the second circuit block is configured to receive the output signal.