Mobile device front end architecture for time division duplexing
First Claim
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1. A switching circuit for use in a frequency division duplex spectrum re-allocated for time division duplex application, the switching circuit comprising:
- a duplex filter configured to filter first signals including frequency and time division duplex receive and transmit signals in a reallocated transmit band;
a gap filter configured to filter time division duplex receive and transmit signals in a reallocated duplex gap band between the reallocated transmit band and a receive band; and
a plurality of switches configured to route the first signals to and from an antenna, respectively, through at least one of the duplex filter and the gap filter the first signals sharing the reallocated transmit band that includes separate sub-bands including a first sub-band allocated for frequency division duplex transmission, a second sub-band allocated for time division duplex transmission and reception, a third sub-band allocated for frequency division duplex transmission, the reallocated duplex gap band including first and second dual-use bands and a fourth sub-band interposed therebetween and allocated for time division duplex transmission and reception, the dual-use bands configured as one of a guard band or a time division duplex band based at least in part on a received signal strength indication.
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Abstract
A switching circuit for use in a frequency division duplex (FDD) spectrum re-allocated for time division duplex (TDD) applications comprises a first filter configured to filter a TDD receive signal, a duplex filter configured to filter an FDD receive signal, and a plurality of switches configured to route the FDD receive signal from an antenna through the duplex filter to receiver circuitry and to route the TDD receive signal from the antenna through the first filter to the receiver circuitry such that the FDD and TDD receive signals share the FDD spectrum.
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Citations
20 Claims
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1. A switching circuit for use in a frequency division duplex spectrum re-allocated for time division duplex application, the switching circuit comprising:
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a duplex filter configured to filter first signals including frequency and time division duplex receive and transmit signals in a reallocated transmit band; a gap filter configured to filter time division duplex receive and transmit signals in a reallocated duplex gap band between the reallocated transmit band and a receive band; and a plurality of switches configured to route the first signals to and from an antenna, respectively, through at least one of the duplex filter and the gap filter the first signals sharing the reallocated transmit band that includes separate sub-bands including a first sub-band allocated for frequency division duplex transmission, a second sub-band allocated for time division duplex transmission and reception, a third sub-band allocated for frequency division duplex transmission, the reallocated duplex gap band including first and second dual-use bands and a fourth sub-band interposed therebetween and allocated for time division duplex transmission and reception, the dual-use bands configured as one of a guard band or a time division duplex band based at least in part on a received signal strength indication. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A switching module for use in a frequency division duplex spectrum re-allocated for time division duplex application, the switching module comprising:
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a switching circuit implemented in a first semiconductor die, the switching circuit including a duplex filter configured to filter first signals including frequency and time division duplex receive and transmit signals in a reallocated transmit band, a gap filter configured to filter time division duplex receive and transmit signals in a reallocated duplex gap band between the reallocated transmit band and a receive band, and a plurality of switches configured to route the first signals to and from an antenna, respectively, through at least one of the duplex filter and the gap filter, the first signals sharing the reallocated transmit band that includes separate sub-bands including a first sub-band allocated for frequency division duplex transmission, a second sub-band allocated for time division duplex transmission and reception, a third sub-band allocated for frequency division duplex transmission, the reallocated duplex gap band including first and second dual-use bands and a fourth sub-band interposed therebetween and allocated for time division duplex transmission and reception, the dual-use bands configured as one of a guard band or a time division duplex band based at least in part on a received signal strength indication; and at least one of a prefilter circuit, a post filter circuit, a power amplifier circuit, a switch circuit, a down converter circuit, and a modulator circuit implemented in a second semiconductor die. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method to transmit and receive frequency division duplex signals and time division duplex signals in a frequency division duplex and time division duplex shared frequency band, the method comprising:
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routing first signals including frequency and time division duplex transmit and receive signals to and from an antenna, respectively, through at least one of a duplex filter and a gap filter, filtering with the duplex filter the first signals in a reallocated transmit band; filtering with the gap filter time division duplex receive and transmit signals in a reallocated duplex gap band between the reallocated transmit band and a receive band, the first signals sharing the reallocated transmit that includes separate sub-bands including a first sub-band allocated for frequency division duplex transmission, a second sub-band allocated for time division duplex transmission and reception, a third sub-band allocated for frequency division duplex transmission, the reallocated duplex gap band including first and second dual-use bands and a fourth sub-band interposed therebetween and allocated for time division duplex transmission and reception; and configuring the dual-use bands as one of a guard band or a time division duplex band based at least in part on a received signal strength indication. - View Dependent Claims (17, 18, 19, 20)
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Specification