Downconversion using digital carrier signal

Abstract

One object is to provide an RF receiver for receiving carrier aggregation signals. By using carrier aggregation (CA), devices such as mobile devices can receive RF signals via different radio frequency (RF) channels. According to one embodiment, an RF receiver includes a first frequency synthesizer for generating a first digital carrier signal. The RF receiver may also include a second frequency synthesizer for generating a second digital carrier signal. A digital mixer included in the RF receiver may be used to downconvert a first analog radio frequency signal to a first intermediate frequency using the first digital carrier signal and the second digital carrier signal, and convert a second analog radio frequency The signal is downconverted to a second intermediate frequency. An RF receiver, mobile device and method are disclosed.

Description

technical field [0001] The present disclosure relates to the field of wireless communications, and more particularly, to an RF receiver for receiving carrier-aggregated radio frequency (RF) signals. Furthermore, the present disclosure relates to corresponding methods and mobile devices. Background technique [0002] By using carrier aggregation (CA), devices such as mobile devices or network access devices can receive RF signals via different radio frequency (RF) channels. The RF channels may be in the same RF frequency band. This can be called in-band CA. Alternatively, the RF channels may be in different RF frequency bands, which may be referred to as inter-band CA. A device may need to downconvert the received signal from RF frequency to a lower intermediate frequency IF after receiving the RF signal. This can be achieved, for example, by feeding the RF signal and the carrier signal into a mixer. [0003] When multiple RF channels are received via CA, each received R...

AI Technical Summary

Problems solved by technology

Therefore, there may be crosstalk and intermodulation between carrier signals, which may degrade reception quality

Also, if each RF signal is received using a separate receiver path, the power consumption of the device may increase

On the other hand, if these RF signals are received using a single receive path, the large frequency separation that exists between the RF signals can be difficult to remove in downconversion, which complicates filtering in subsequent signal processing steps

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