Systems and methods for level shifting using AC coupling

A level shifter system comprising

• a capacitor configured to receive a binary input signal, to decouple AC and DC components of the binary input signal, and to pass the AC component to an intermediate node;
• a voltage divider having first and second resistors connected in series between a supply voltage and ground, wherein the intermediate node is located between the first and second resistors;
• and
• Duty Cycle Compensation (DCC) circuitry that includes
• a first branch comprising the voltage divider, the capacitor, and an inverter;
• wherein the inverter is coupled to third and fourth resistors and
• wherein the third resistor is coupled between the inverter and the supply voltage and the fourth resistor is coupled between the inverter and ground;
• a second branch of the same construction as the first branch;
• wherein both branches are coupled to the inputs of a differential amplifier;
• wherein the first branch is coupled to receive the input signal, the second branch is coupled to receive the inverted input signal, and the differential amplifier output is coupled to an amplifier.

A level shifter and Duty Cycle Compensation (DCC) system comprising:

• first and second branches,
• wherein each of the first and second branches includes
• an inverter coupled to two resistors, wherein the first resistor is coupled between the inverter and a voltage supply and the second resistor is coupled between the inverter and ground, wherein the inverter is configured to receive a corresponding input signal and top produce a corresponding intermediate signal;
• a capacitor configured to receive the corresponding intermediate signal, to decouple AC and DC components of the corresponding intermediate signal, and to pass the AC component of the corresponding intermediate signal to an intermediate node;
• a voltage divider having two resistors connected in series between the supply voltage and ground, wherein the intermediate node is located between the two resistors;
• and
• wherein the intermediate node of each branch is coupled to a corresponding input of a differential amplifier;
• wherein the first branch is coupled to receive an first input signal, the second branch is coupled to receive the inverted first input signal, and an output of the differential amplifier is coupled to an amplifier.