Multi-standard wireless transmitter

摘要

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.

主权项

1. 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.