Radio frequency switch control circuitry

A level shifter for a radio frequency switch, the level shifter comprising:

• a first enable level shifter configured to receive a first switch enable signal and to output a first level-shifted switch enable signal, the first enable level shifter powered by a positive charge pump voltage;
• a first level-shifting n-type transistor;
• a first cascode n-type transistor in series with the first level-shifting n-type transistor between a negative charge pump voltage and a first output that provides a first switch control signal;
• a first level-shifting p-type transistor having a gate controlled by the first level-shifted switch enable signal;
• and
• a first cascode p-type transistor in series with the first level-shifting p-type transistor between the positive charge pump voltage and the first output.

A radio frequency switch system comprising:

• a radio frequency switch configured to receive a radio frequency signal and controlled by a first switch control signal;
• a positive charge pump configured to generate a positive charge pump voltage;
• a negative charge pump configured to generate a negative charge pump voltage;
• and
• a level shifter operable to level shift a first switch enable signal to generate the first switch control signal at a first output, the level shifter including a first enable level shifter powered by the positive charge pump voltage and configured to receive a first switch enable signal and to output a first level-shifted switch enable signal, a first level-shifting n-type transistor and a first cascode n-type transistor in series between the negative charge pump voltage and the first output, and a first level-shifting p-type transistor and a first cascode p-type transistor in series between the positive charge pump voltage and the first output, the first level-shifting p-type transistor having a gate controlled by the first level-shifted switch enable signal.