Front-end systems with adjustable filter architecture
AssigneeSkyworks Solutions, Inc.
InventorDavid Richard Pehlke
Life of this patent
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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 first multi-throw switch having an antenna terminal connected to the antenna and a second multi-throw switch having a transmit terminal connected to an output of the power amplifier and a receive terminal connected to an input of the low noise amplifier, the adjustable filter further including a first bandpass filter connected between a first filter terminal of the first multi-throw switch and a first filter terminal of the second multi-throw switch, a second bandpass filter connected between a second filter terminal of the first multi-throw switch and a second filter terminal of the second multi-throw switch, and a stopband filter connected between the first filter terminal of the first multi-throw switch and the second filter terminal of the first multi-throw switch.
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 first multi-throw switch of the adjustable filter that is connected to the antenna, the adjustable filter including a first bandpass filter connected to a first filter terminal of the first multi-throw switch, a second bandpass filter connected to a second filter terminal of the first multi-throw switch, and a stopband filter connected between the first filter terminal and the second filter terminal;
- and
- controlling a state of a second multi-throw switch of the adjustable filter, the second multi-throw switch having a first filter terminal connected to the first bandpass filter, a second filter terminal connected to the second bandpass filter, a transmit terminal connected to an output of the power amplifier, and a receive terminal connected to an input of the low noise amplifier.
A front-end system comprising:
- a power amplifier having an output;
- a low noise amplifier having an input;
- and
- an adjustable filter including a first multi-throw switch having an antenna terminal for connecting to an antenna and a second multi-throw switch having a transmit terminal connected to the output of the power amplifier and a receive terminal connected to the input of the low noise amplifier, the adjustable filter further including a first bandpass filter connected between a first filter terminal of the first multi-throw switch and a first filter terminal of the second multi-throw switch, a second bandpass filter connected between a second filter terminal of the first multi-throw switch and a second filter terminal of the second multi-throw switch, and a stopband filter connected between the first filter terminal of the first multi-throw switch and the second filter terminal of the first multi-throw switch.
Dependencies are inferred from the claim text.