Mobile device front end architecture for time division duplexing
AssigneeSkyworks Solutions, Inc.
InventorDavid Richard Pehlke
Life of this patent
Estimating the term…
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.
Claims20
A switching circuit for use in a frequency division duplex spectrum re-allocated for time division duplex application, the switching circuit comprising:
- a first filter configured to filter a time division duplex receive signal;
- a second filter configured to filter a time division duplex transmit signal;
- a duplex filter configured to filter a frequency division duplex transmit signal and a frequency division duplex receive signal;
- and
- a plurality of switches configured to route the frequency division duplex receive signal from an antenna through the duplex filter to receiver circuitry and to route the time division duplex receive signal from the antenna through the first filter to the receiver circuitry, the frequency division duplex and time division duplex transmit and receive signals sharing a reallocated frequency division duplex spectrum that includes a reallocated transmit band including a first sub-band allocated for frequency division duplex transmission, a second sub-band separate from the first sub-band and allocated for time division duplex transmission and reception, and a third sub-band interposed between the first and second sub-bands, the first filter configured to pass the time division duplex receive signals in the second sub-band, the second filter configured to pass the time division duplex transmit signals in the second sub-band, and the duplex filter configured to pass the frequency division duplex transmit signals in the first sub-band.
A switching module for use in a frequency division duplex spectrum re-allocated for time division duplex application, the switching module comprising:
- a switching circuit implemented in a first semiconductor die, the switching circuit including a first filter configured to filter a time division duplex receive signal, a second filter configured to filter a time division duplex transmit signal, a duplex filter configured to filter a frequency division duplex transmit signal and a frequency division duplex receive signal, and a plurality of switches configured to route the frequency division duplex receive signal from an antenna through the duplex filter to receiver circuitry and to route the time division duplex receive signal from the antenna through the first filter to the receiver circuitry, the frequency division duplex and time division duplex transmit and receive signals sharing the reallocated frequency division duplex spectrum that includes a reallocated transmit band including a first sub-band allocated for frequency division duplex transmission, a second sub-band separate from the first sub-band and allocated for time division duplex transmission and reception, and a third sub-band interposed between the first and second sub-bands, the first filter configured to pass the time division duplex receive signals in the second sub-band, the second filter configured to pass the time division duplex transmit signals in the second sub-band, and the duplex filter configured to pass the frequency division duplex transmit signals in the first sub-band;
- 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.
A method to transmit and receive frequency division duplex signals and time division duplex signals in a frequency division duplex and TDD time division duplex shared frequency band, the method comprising:
- routing a frequency division duplex receive signal from an antenna to receiver circuitry through a duplex filter configured to filter the frequency division duplex receive signal, the duplex filter further configured to filter a frequency division duplex transmit signal;
- routing a time division duplex receive signal from the antenna to the receiver circuitry through a first filter configured to filter the time division duplex receive signal;
- and
- routing a time division transmit signal through a second filter configured to filter the time division duplex transmit signal, the frequency division duplex and time division duplex transmit and receive signals sharing a reallocated frequency division duplex spectrum that includes a reallocated transmit band including a first sub-band allocated for frequency division duplex transmission, a second sub-band separate from the first sub-band and allocated for time division duplex transmission and reception, and a third sub-band interposed between the first and second sub-bands, the first filter configured to pass the time division duplex receive signals in the second sub-band, the second filter configured to pass the time division duplex transmit signals in the second sub-band, and the duplex filter configured to pass the frequency division duplex transmit signals in the first sub-band.
Dependencies are inferred from the claim text.