Charging and discharging circuits for assisting charge pumps
AssigneeSkyworks Solutions, Inc.
InventorGuillaume Alexandre Blin
Life of this patent
Estimating the term…
Abstract
Charging and discharging circuits for assisting charge pumps are disclosed. In certain embodiments, a radio frequency (RF) switch system includes an RF switch that receives an RF signal and is controlled by a switch control signal received at an input, a first charge pump configured to generate a first charge pump voltage, a level shifter powered by the first charge pump voltage and that generates the switch control signal based on a switch enable signal, and a charge pump assistance switch coupled to the input of the radio frequency switch and that activates to assist the first charge pump in response to a transition of the switch enable signal from a first state to a second state.
Claims20
A front end system for a mobile device, the front end system comprising:
- a radio frequency field-effect transistor switch having a source configured to receive a radio frequency signal and a gate configured to receive a switch control signal;
- a level shifter powered by a first supply voltage and a second supply voltage, the lever shifter including an input configured to receive a switch enable signal and an output configured to provide the switch control signal;
- a first resistor connected between the output of the level shifter and a tap node;
- a second resistor connected between the tap node and the gate of the radio frequency field-effect transistor switch;
- and
- a first assistance switch connected between the tap node and a ground voltage and configured to activate in response to a transition of the switch enable signal from a first state to a second state.
A mobile device comprising:
- a power management system configured to generate a first supply voltage and second supply voltage;
- and
- a front end system including a radio frequency field-effect transistor switch having a source configured to receive a radio frequency signal and a gate configured to receive a switch control signal, a level shifter powered by the first supply voltage and the second supply voltage and including an input configured to receive a switch enable signal and an output configured to provide the switch control signal, a first resistor connected between the output of the level shifter and a tap node, a second resistor connected between the tap node and the gate of the radio frequency field-effect transistor switch, and a first assistance switch connected between the tap node and a ground voltage and configured to activate in response to a transition of the switch enable signal from a first state to a second state.
A method of level shifting in a mobile device, the method comprising:
- receiving a radio frequency signal at a source of a radio frequency field-effect transistor switch and a switch control signal at a gate of the radio frequency field-effect transistor switch;
- powering a level shifter using a first supply voltage and a second supply voltage;
- receiving a switch enable signal at an input to the lever shifter and providing the switch control signal at an output of the level shifter, the output of the level shifter connected to a tap node through a first resistor and the tap node connected to the gate of the radio frequency field-effect transistor switch through a second resistor;
- and
- activating a first assistance switch in response to a transition of the switch enable signal from a first state to a second state, the first assistance switch connected between the tap node and a ground voltage.
Dependencies are inferred from the claim text.