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US 9,178,538 B2Granted
Multi-standard wireless transmitter
AssigneeSTMicroelectronics S.r.l.
InventorsNicolas Delaunay, Eric Kerherve, Nathalie Deltimple, Didier Belot
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Abstract
The invention concerns a circuit for multi-standard wireless RF transmission comprising: input circuitry (302 to 314) for generating a transmission signal (IT(t), QT(t)) based on an input data signal (I, Q); a power amplifier (316) adapted to amplify said transmission signal to provide an output signal (S(t)) for transmission via at least one antenna; and feedback circuitry (320 to 340) comprising at least one variable low-pass filter (334, 336) for generating a feedback signal (IFB, QFB) based on said output signal, wherein said input circuitry further comprises pre-distortion circuitry (302) adapted to modify said input data signal (I, Q) based on said feedback signal.
Claims20
A mobile device comprising:
- a processor block configured to generate a selection signal indicating a selected communications standard for wireless radio frequency (RF) transmission;
- and
- a transceiver circuit configured to receive said selection signal and comprising:
- input circuitry for generating a transmission signal based on an input data signal, wherein said input circuitry comprises at least one analog variable low-pass filter adapted to filter said input data signal;
- a power amplifier adapted to amplify said transmission signal to provide an output signal;
- feedback circuitry comprising at least one digital variable low-pass filter for generating a feedback signal based on said output signal, wherein said input circuitry further comprises pre-distortion circuitry adapted to modify said input data signal based on said feedback signal;
- a variable oscillator configured to generate at least one frequency signal, the input circuitry being configured to perform frequency up conversion of a signal at the output of the at least one analog variable low-pass filter based on the at least one frequency signal, the feedback circuitry being configured to perform a frequency down conversion of a signal at the input of the at least one digital variable low-pass filter based on the at least one frequency signal;
- and
- a controller configured to receive the selection signal and generate a first control signal, a second control signal, and a third control signal based on the selection signal, the first control signal being configured to control a first variable cut-off frequency of the at least one analog variable low-pass filter, the second control signal being configured to control a second variable cut-off frequency of the at least one digital variable low-pass filter, the at least one frequency signal being generated by the variable oscillator based on the third control signal.
6 more elements
A method of multi-standard wireless radio frequency (RF) transmission comprising:
- generating a transmission signal based on an input data signal;
- generating, by a controller, a first control signal, a second control signal, and a third control signal;
- generating, by a variable oscillator, at least one frequency signal based on the third control signal;
- filtering said transmission signal, by at least one analog variable low-pass filter, to provide a filtered transmission signal, the at least one analog variable low-pass filter having a first variable cut-off frequency based on the first control signal;
- frequency up converting said filtered transmission signal based on the at least one frequency signal to provide a converted filtered transmission signal;
- amplifying said converted filtered transmission signal, by a power amplifier, to provide an output signal for transmission via at least one antenna;
- frequency down converting said output signal based on the at least one frequency signal to provide a feedback signal;
- filtering said feedback signal, by at least one digital variable low-pass filter, to provide a filtered feedback signal, the at least one digital variable low-pass filter having a second variable cut-off frequency based on the second control signal;
- and
- pre-distorting said input data signal based on said filtered feedback signal.
7 more elements
A circuit comprising:
- input circuitry having a first input and a second input, the first input coupled to an input data signal;
- a digital-to-analog converter coupled to an output of the input circuitry;
- an analog variable low-pass filter coupled to an output of the digital-to-analog converter;
- an up-converting mixer coupled to an output of the analog variable low-pass filter;
- a power amplifier coupled to an output of the up-converting mixer, the power amplifier configured to provide an output signal;
- at least one antenna coupled to the output signal;
- an attenuator coupled to the output signal;
- a down-converting mixer coupled to the output of the attenuator;
- an analog fixed low-pass filter coupled to an output of the down-converting mixer;
- an analog-to-digital converter coupled to an output of the analog fixed low-pass filter;
- a digital variable low-pass filter coupled to an output of the analog-to-digital converter, the digital variable low-pass filter configured to provide a feedback signal to the second input of the input circuitry, the input circuitry further comprising:
- a phase shifter coupled to the second input of the input circuitry;
- and
- a subtracter having a first input coupled to the input data signal and a second input coupled to an output of the phase shifter, the output of the subtracter coupled to the output of the input circuitry;
- a variable oscillator configured to generate at least one frequency signal, the up-converting mixer being configured to perform frequency up conversion of a signal at the output of the analog variable low-pass filter based on the at least one frequency signal, the down-converting mixer being configured to perform a frequency down conversion of a signal at the output of the attenuator based on the at least one frequency signal;
- and
- a controller configured to generate a first control signal, a second control signal, and a third control signal, the first control signal being configured to control a first variable cut-off frequency of the analog variable low-pass filter, the second control signal being configured to control a second variable cut-off frequency of the digital variable low-pass filter, the least one frequency signal being generated by the variable oscillator based on the third control signal.
14 more elements
A circuit for multi-standard wireless radio frequency (RF) transmission comprising:
- input circuitry for generating a transmission signal based on an input data signal, wherein said input circuitry comprises at least one analog variable low-pass filter with a first variable cut-off frequency;
- a power amplifier adapted to amplify said transmission signal to provide an output signal for transmission via at least one antenna;
- feedback circuitry comprising at least one digital variable low-pass filter with a second variable cut-off frequency for generating a feedback signal based on said output signal, wherein said input circuitry further comprises pre-distortion circuitry adapted to modify said input data signal based on said feedback signal, wherein said feedback signal at the pre-distortion circuitry is based on said output signal from 0 Hz to said variable cut-off frequency;
- a variable oscillator configured to generate at least one frequency signal, the input circuitry being configured to perform frequency up conversion of a signal at the output of the at least one analog variable low-pass filter based on the at least one frequency signal, the feedback circuitry being configured to perform a frequency down conversion of a signal at the input of the at least one digital variable low-pass filter based on the at least one frequency signal;
- and
- a controller configured to generate a first control signal, a second control signal, and a third control signal, the first control signal being configured to control the first variable cut-off frequency of the at least one analog variable low-pass filter, the second control signal being configured to control the second variable cut-off frequency of the at least one digital variable low-pass filter, the at least one frequency signal being generated by the variable oscillator based on the third control signal.
3 more elements
Dependencies are inferred from the claim text.