Voltage generator with low clock feedthrough

A radio frequency system comprising:

• a voltage generator including a charge pump and a clock generation circuit;
• the charge pump including a first set of two switches arranged between two voltages, a second set of two switches arranged between one of the two voltages and an output node, and a fly capacitor connected to the first set of two switches and the second set of two switches;
• and the clock generation circuit configured to provide clock signals to the charge pump such that (i) the two switches of the first set transition state at different times and (ii) the two switches of the second set transition state at different times, the clock generation circuit including a level shifter configured to generate a level shifted clock signal of at least one of the clock signals, the level shifter including cross coupled transistors;
• a switch driver configured to receive an output voltage from the voltage generator and to output a control signal;
• and
• a radio frequency switch configured to toggle state based on the control signal, the radio frequency switch configured to pass a radio frequency signal.

A method of controlling a radio frequency switch, the method comprising:

• generating a voltage using a voltage generator, the voltage generator including a charge pump and a clock generation circuit;
• the charge pump including a first set of two switches arranged between two voltages, a second set of two switches arranged between one of the two voltages and an output node, and a fly capacitor connected to the first set of two switches and the second set of two switches;
• and the clock generation circuit configured to provide clock signals to the charge pump such that (i) the two switches of the first set transition state at different times and (ii) the two switches of the second set transition state at different times, the clock generation circuit including a level shifter that generates a level shifted clock signal of at least one of the clock signals using cross coupled transistors;
• and
• driving a radio frequency switch with a control signal that is based on the voltage to toggle a state of the radio frequency switch.