Transmitting local oscillator leakage digital calibration system and method based on radio frequency transceiver chip

Abstract

The invention provides a local oscillator leakage calibration system and method for a zero intermediate frequency transceiver chip, and the system comprises a baseband programmable chip module which is connected with a zero intermediate frequency chip transmitting module, and the zero intermediate frequency chip transmitting module is connected with a zero intermediate frequency chip receiving module; local oscillator leakage information is generated from the zero intermediate frequency chip transmitting module and flows to a zero intermediate frequency chip receiving module; the zero intermediate frequency chip receiving module converts the local oscillator leakage information into baseband information of a preset frequency point and performs analog-to-digital conversion on the baseband information of the preset frequency point; after the zero intermediate frequency chip receiving module carries out analog-to-digital conversion, baseband information is sent to the baseband programmable chip module to be analyzed and processed, a compensation value is obtained, and calibration is completed; a calibration result of the transmitting end is not influenced by leakage of a receiving endlocal oscillator, and the receiving end local oscillator does not need to be calibrated in advance.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a digital calibration system and method for transmitting local oscillator leakage based on a radio frequency transceiver chip, and more specifically to a design method for a digital circuit and a calibration method for local oscillator leakage of a radio frequency transceiver chip. Background technique [0002] Zero-IF transceiver chip is a hot research field of current wireless radio frequency hardware platform. In the current context, communication standards are rapidly iterating, and new application scenarios are emerging one after another. Zero-IF architecture chips are highly favored by the market today due to their simplified system architecture, broad spectrum coverage, high integration features, and affordable prices. [0003] However, with the increasing integration of zero-IF chips, the coupling between local oscillator signals and front-end devices is becoming mor...

AI Technical Summary

Problems solved by technology

[0003] However, with the increasing integration of zero-IF chips, the coupling between the local oscillator signal and the front-end device is becoming more and more serious. After being amplified by the front-end amplifier, the leakage of the transmitter local oscillator has become increasingly prominent.

In the zero-IF architecture, the leaked local oscillator signal is embedded in the transmit spectrum and is difficult to filter out, which will deteriorate the signal-to-noise ratio of the transmit signal, occupy the power of the transmit signal, and reduce system performance.

[0004] Existing local oscillator leakage compensation technologies mostly design compensation methods from the perspective of DC components. Compensating the receiver local oscillator is the same as the transmitting local oscillator. At this time, the receiving local oscillator must be calibrated first, and the steps are more complicated.

And generally need to design additional hardware modules, the cost is higher

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