Front-end systems with adjustable filter architecture
AssigneeSkyworks Solutions, Inc.
InventorDavid Richard Pehlke
Life of this patent
Estimating the term…
Abstract
Front-end systems with an adjustable filter architecture are provided. In certain embodiments, a front-end system includes a first bandpass filter with a first passband, a second bandpass filter with a second passband, a stopband filter with a stopband, and switches for controlling connectivity of the filters along transmit and receive paths. The first passband and the second passband include a frequency overlap region, which the stopband at least partially overlaps. The re-configurability of the switches allows for the overall filtering characteristic of the adjustable filter to adjust the duplex gap between transmit and receive passband edges, as well as the passband edges themselves.
Claims20
A mobile device comprising:
- an antenna;
- and
- a front-end system including an adjustable filter, a power amplifier, and a low noise amplifier, the adjustable filter including a transmit switch having a transmit terminal connected to an output of the power amplifier, a receive switch having a receive terminal connected to an input of the low noise amplifier, a multi-throw switch having an antenna terminal coupled to the antenna, a transmit bandpass filter connected between a first filter terminal of the multi-throw switch and a filter terminal of the transmit switch, a receive bandpass filter connected between a second filter terminal of the multi-throw switch and a filter terminal of the receive switch, and a stopband filter connected between the first filter terminal and the second filter terminal.
A method of adjustable filtering in a mobile device, the method comprising:
- providing a transmit signal from an output of a power amplifier to an antenna by way of an adjustable filter;
- receiving a receive signal from an antenna at an input of a low noise amplifier by way of the adjustable filter;
- controlling a state of a transmit switch of the adjustable filter, the transmit switch having a transmit terminal connected to the output of the power amplifier;
- controlling a state of a receive switch of the adjustable filter, the receive switch having a receive terminal connected to the input of the low noise amplifier;
- controlling a state of a multi-throw switch of the adjustable filter, the multi-throw switch having an antenna terminal coupled to the antenna;
- providing filtering using the adjustable filter, the adjustable filter including a transmit bandpass filter connected between a first filter terminal of the multi-throw switch and a filter terminal of the transmit switch, a receive bandpass filter connected between a second filter terminal of the multi-throw switch and a filter terminal of the receive switch, and a stopband filter connected between the first filter terminal and the second filter terminal.
A front-end system comprising:
- a power amplifier having an output;
- a low noise amplifier having an input;
- and
- an adjustable filter including a transmit switch having a transmit terminal connected to the output of the power amplifier, a receive switch having a receive terminal connected to the input of the low noise amplifier, a multi-throw switch having an antenna terminal for coupling to an antenna, a transmit bandpass filter connected between a first filter terminal of the multi-throw switch and a filter terminal of the transmit switch, a receive bandpass filter connected between a second filter terminal of the multi-throw switch and a filter terminal of the receive switch, and a stopband filter connected between the first filter terminal and the second filter terminal.
Dependencies are inferred from the claim text.