Technique for suppressing noise in a transmitter device

摘要

A technique of suppressing noise in a transmitter device (300) is provided, wherein the transmitter device (300) comprises a baseband signal processing stage (301) operating at baseband frequency and comprising a modulator (316, 320) for converting a baseband signal into an RF signal, and an RF signal processing stage (301) operating at RF and comprising an amplifier (330). A method implementation of this technique comprises the steps performed in a feedback loop (333, 336) coupled around the amplifier (330) of tapping the RF signal processing stage downstream of the amplifier (330) to obtain an amplified RF signal comprising a baseband signal component and a noise component, downconverting the tapped RF signal to baseband frequency, removing the baseband signal component from the downconverted signal, upconverting the resulting signals still comprising the noise component to RF frequency and feeding the upconverted signal back to the RF signal processing stage upstream of the amplifier (330) thereby suppressing the noise component.

主权项

1. A method of suppressing noise in a transmitter device having a baseband signal processing stage and a radio frequency (RF) processing stage, the baseband signal processing stage operating at a baseband frequency and comprising at least one modulator for converting a baseband signal into an RF signal, and the RF signal processing stage operating at RF and comprising at least one amplifier for amplifying said RF signal, wherein the method is implemented in a feedback loop coupled around the at least one amplifier and comprises the following steps:
tapping the RF signal processing stage downstream of the at least one amplifier to obtain an amplified RF signal comprising a baseband signal component and a noise component; downconverting the tapped RF signal to baseband frequency; removing the baseband signal component from the downconverted signal; upconverting the resulting signal still comprising the noise component to RF; and feeding the upconverted signal back to the RF signal processing stage upstream of the at least one amplifier, thereby suppressing the noise component.