Multi-band device with reduced band loading
First Claim
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1. A radio frequency system comprising:
- a first transmission path configured to provide a first radio frequency signal; and
a second transmission path including a power amplifier configured to provide a second radio frequency signal, a multi-throw switch configured to provide the second radio frequency signal to a selected output of a plurality of outputs of the multi-throw switch, and a matching network including a passive impedance element in series between an output of the power amplifier and an input of the multi-throw switch, and the multi-throw switch having an input impedance configured to damp a standing wave resonance in the second transmission path due to coupling with the first transmission path when the first transmission path is active.
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Abstract
In an embodiment, an apparatus includes a first radio frequency (RF) signal path and a second RF signal path. The first RF signal path can provide a first RF signal when active and the second RF signal path can provide a second RF signal when active. The second RF signal path can include a matching network with a load impedance configured to prevent a resonance in the second RF signal path due to coupling with the first RF signal path when the first RF signal path is active.
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Citations
20 Claims
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1. A radio frequency system comprising:
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a first transmission path configured to provide a first radio frequency signal; and a second transmission path including a power amplifier configured to provide a second radio frequency signal, a multi-throw switch configured to provide the second radio frequency signal to a selected output of a plurality of outputs of the multi-throw switch, and a matching network including a passive impedance element in series between an output of the power amplifier and an input of the multi-throw switch, and the multi-throw switch having an input impedance configured to damp a standing wave resonance in the second transmission path due to coupling with the first transmission path when the first transmission path is active. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A radio frequency front end comprising:
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a first transmission path configured to provide a first radio frequency signal; and a second transmission path including a power amplifier configured to provide a second radio frequency signal, a multi-throw switch configured to provide the second radio frequency signal to a selected output of a plurality of outputs of the multi-throw switch, a matching network coupled between an output of the power amplifier and an input of the multi-throw switch, and means for damping a resonance in a signal path of the second transmission path due to coupling with the first transmission path, the signal path being from the power amplifier to the multi-throw switch. - View Dependent Claims (14, 15)
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16. A method of amplifying radio frequency signals and damping resonance due to coupling between radio frequency signal paths, the method comprising:
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amplifying a first radio frequency signal with a first radio frequency signal path; damping, using an input impedance of a multi-throw switch of a second radio frequency signal path, a resonance in the second radio frequency signal path due to coupling with the first radio frequency signal path during said amplifying, the multi-throw switch being coupled to an amplifier of the second radio frequency signal path by way of a matching network of the second radio frequency signal path; and providing, in an active state of the second radio frequency signal path, a second radio frequency signal from the amplifier of the second radio frequency signal path to a selected output of a plurality of outputs of the multi-throw switch. - View Dependent Claims (17, 18, 19, 20)
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Specification