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...

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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 tran

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