iq mismatch self-calibrating programmable gain amplifier, calibration method and application

Abstract

The invention provides an IQ mismatch self-calibration programmable gain amplifier, a calibration method and an application, including: an image suppression module for calibrating an IQ signal; a comparison module for obtaining a flag bit for generating a gain error symbol and a phase error symbol; generating a calibration clock signal A clock synthesis module for generating a gain error control bit; a gain error detection module for generating a gain error control bit; and a phase error detection module for generating a phase error control bit. The invention improves the gain and phase matching degree of the output IQ signal by changing the input resistance and the series connection resistance of the operational amplifier with IQ two channels, and can set the size of the resistance array according to system requirements and sampling precision. The clock frequency is selected according to the structural design of the image suppressor and the system performance requirements, and then the count structure and register structure of the digital error detector are estimated, and the self-calibration control bits are fed back to the image suppression module to realize the quadrature matching of the IQ signals and effectively improve the image suppression ratio. , thereby improving signal processing capability and RF circuit performance.

Description

technical field [0001] The invention relates to the technical field of wireless communication integrated circuits, in particular to an IQ mismatch self-calibration programmable gain amplifier, a calibration method and an application. Background technique [0002] With the continuous development of radio frequency (RF, Radio Frequency) technology, the application of radio frequency devices is becoming more and more extensive, and the types are increasing day by day. Radio frequency technology mainly includes up-conversion technology and down-conversion technology. The down-conversion technology receives external radio frequency signals and down-converts them into intermediate frequency signals, and then converts the intermediate frequency signals into signals recognizable by digital circuits to further control the operation of digital circuits. The up-conversion technology converts the signal sent by the digital circuit into an analog signal, then up-converts it into a radio...

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Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an IQ mismatch self-calibration programmable gain amplifier, a calibration method and its application, which are used to solve the problem of image in the radio frequency circuit caused by IQ signal mismatch in the prior art. The problem of low suppression ratio

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