Radio frequency receiver as well as electronic apparatus containing the same

Abstract

A radio frequency receiver includes a radio frequency front end lower frequency conversion unit and a direct current drift cancellation unit, wherein, the radio frequency front end lower frequency conversion unit is used to receive the radiofrequency signals of operation mode, and calibrating signals of calibration mode, and to lower-convert the radiofrequency signals and calibrating signals intobaseband signals to output; the direct current drift cancellation unit receives the baseband signals after the lower frequency conversion of the calibrating signals, passing through the FFT arithmetic, generates and stores direct current calibration tables corresponding to different receiver gains, in the calibration mode; and the direct current drift cancellation unit executes direct current drift cancellation to the radiofrequency signals by looking for the stored direct current calibration tables, in the work mode. The inventive radio frequency receiver and electronic appliance with the same can be applied to various wireless receiver application occasions, and can effectively eliminate the affect of the direct current excursion produced by the radio frequency receiver to the demodulation performance of the radio frequency receiver.

Description

technical field [0001] The present invention relates to a communication device, in particular to a radio frequency receiver and electronic equipment with the radio frequency receiver. Background technique [0002] With the rapid development of wireless communication technology in recent years, wireless communication system products have become more and more popular, and have become an important part of the development of today's human information society. The radio frequency receiver is located at the forefront of the wireless communication system, and its structure and performance directly affect the entire communication system. Optimizing the design structure and selecting the appropriate manufacturing process to improve the performance and price ratio of the system is the pursuit of radio frequency design. [0003] The most attractive feature of the zero-IF receiver is that it does not need to pass through the intermediate frequency during the down-conversion process, an...

AI Technical Summary

Problems solved by technology

The DC deviation is often larger than the noise of the RF front-end, which deteriorates the signal-to-noise ratio. At the same time, a large DC deviation may saturate the amplifiers at all levels after the mixer, and cannot amplify useful signals.

Seriously affect the demodulation performance of the receiver

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