Envelope controlled radio frequency switches
AssigneeSkyworks Solutions, Inc.
InventorsFlorinel G. Balteanu, Yu Zhu, Paul T. DiCarlo
Life of this patent
Estimating the term…
Abstract
Apparatus and methods for envelope controlled radio frequency (RF) switches are provided. In certain embodiments, a power amplifier provides an RF signal to an antenna by way of an RF switch. Additionally, the envelope signal is used not only to control a power amplifier supply voltage of the power amplifier, but also to control a regulated voltage used to turn on the RF switch. For example, a level shifter can use a regulated voltage from charge pump circuitry to turn on the RF switch, and the envelope signal can be provided to the charge pump circuitry and used to control the voltage level of the regulated voltage over time.
Claims20
A mobile device comprising:
- an antenna;
- and
- a front end system including a radio frequency field-effect transistor switch configured to provide a radio frequency signal to the antenna in a first state of an input control signal, and a charge pump configured to generate a first regulated voltage that is provided to a gate of the radio frequency field-effect transistor switch in the first state of the input control signal, the charge pump circuitry including a first filter having a first terminal electrically connected to the first regulated voltage and a second terminal configured to receive an envelope signal indicating an envelope of the radio frequency signal.
A radio frequency switch system comprising:
- a radio frequency field-effect transistor switch configured to provide a radio frequency signal to an antenna terminal in a first state of an input control signal;
- and
- a charge pump configured to generate a first regulated voltage that is provided to a gate of the radio frequency field-effect transistor switch in the first state of the input control signal, the charge pump circuitry including a first filter having a first terminal electrically connected to the first regulated voltage and a second terminal configured to receive an envelope signal indicating an envelope of the radio frequency signal.
A method of radio frequency switch control, the method comprising:
- providing a radio frequency signal to an antenna through a radio frequency field-effect transistor switch in a first state of an input control signal;
- generating a first regulated voltage using a charge pump that includes a first filter having a first terminal electrically connected to the first regulated voltage and a second terminal configured to receive an envelope signal indicating an envelope of the radio frequency signal;
- and
- providing the first regulated voltage to a gate of the radio frequency field-effect transistor switch in the first state of the input control signal.
Dependencies are inferred from the claim text.