Systems and methods of RF power transmission, modulation, and amplification
First Claim
Patent Images
1. A method, in a transceiver, for reducing noise in a receive channel caused by a transmit channel, comprising:
- determining a transmit frequency of the transceiver and a receive frequency of the transceiver;
determining a noise floor requirement of the transceiver based on the transmit frequency and the receive frequency; and
adjustably attenuating a transmit waveform, with a filter at an output of a multiple-input-single-output (MISO) device, at one or more frequencies within a receive band of frequencies associated with the receive frequency such that the noise floor requirement is satisfied at the receive frequency, wherein the adjustably attenuating comprises filtering at least one input to the MISO device and the output of the MISO device at substantially the same notch filter frequency.
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Abstract
Embodiments of the present invention reduce or eliminate the need for fixed frequency high Q band filtering for both full duplex (FDD) and half duplex (TDD) systems. Transceiver architectures according to embodiments of the present invention can be designed to have a single input/output for both FDD and TDD based standards. Further, according to embodiments, because the duplexer and/or SAW power losses are lowered or removed altogether, the system power output requirements can be met more easily and with higher efficiency.
748 Citations
18 Claims
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1. A method, in a transceiver, for reducing noise in a receive channel caused by a transmit channel, comprising:
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determining a transmit frequency of the transceiver and a receive frequency of the transceiver; determining a noise floor requirement of the transceiver based on the transmit frequency and the receive frequency; and adjustably attenuating a transmit waveform, with a filter at an output of a multiple-input-single-output (MISO) device, at one or more frequencies within a receive band of frequencies associated with the receive frequency such that the noise floor requirement is satisfied at the receive frequency, wherein the adjustably attenuating comprises filtering at least one input to the MISO device and the output of the MISO device at substantially the same notch filter frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for reducing noise in a receive channel caused by a transmit channel, the apparatus comprising:
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a transceiver comprising; a multiple-output-single-input (MISO) device, wherein the transceiver is configured to adjustably attenuate a transmit waveform, with a first filter at an output of the MISO device, at one or more frequencies within a receive band of frequenci es associated with a receive frequency of the transceiver such that a noise floor requirement of the, transceiver is satisfied at the receive frequency; and a vector power amplification (VPA) transmitter that includes; a plurality of vector modulators; a plurality of second filters coupled to corresponding outputs of the plurality of vector modulators; and a plurality of drivers coupled to corresponding outputs ofthe plurality of second filters; and an antenna coupled to the transceiver and configured to transmit the transmit waveform. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A telephone for reducing noise in a receive channel caused by a transmit channel, the telephone comprising:
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a transceiver comprising; a multiple-input-single-output (MISO) device, wherein the transceiver is configured to adjustably attenuate a transmit waveform, with a first filter at an output of the MISO device, at one or more frequencies within a receive band of frequencies associated with a receive frequency of the transceiver such that a noise floor requirement of the transceiver is satisfied at the receive frequency; and a vector power amplification (VPA) transmitter that includes; a plurality of vector modulators; a plurality of second filters coupled;
to corresponding outputs of the plurality of vector modulators; anda plurality of drivers coupled to corresnonding outputs of the plurality of second filters; and an antenna coupled to the transceiver and configured to transmit the transmit waveform. - View Dependent Claims (16, 17, 18)
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Specification