Randomized channel calibration method and system based on pseudo-random codes

Abstract

The invention discloses a randomized channel calibration method and system based on pseudo-random codes , which are used for a multi-channel time domain interleaved analog-to-digital converter, and the method comprises the following steps of: adding delta M randomized channels outside M standard channels of the multi-channel time domain interleaved analog-to-digital converter to form M + delta M channels; generating a pseudo-random code for performing channel selection on the M + delta M channels; selecting M channels from the M + delta M channels as effective channels according to the pseudo-random code; and generating a sampling clock and a digital code output clock according to the selection result of the effective channel so as to control the selected effective channel to perform dataprocessing and output a digital code. The method and system are based on a pseudo-random code generation circuit, complete randomization of channels can be achieved under the condition that time is long enough, frequency spectrum stray of output signals can be effectively reduced, random gain errors and offset errors between the channels are effectively reduced, and the performance of the whole analog-digital converter is improved.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuit design, and in particular relates to a randomized channel calibration method and system based on pseudo-random codes. Background technique [0002] With the rapid development of integrated circuit technology, portable intelligent terminal products can be seen everywhere. The current development trend of the new generation of information technology is to realize the interconnection of all things. The premise is that the needs for object identification and information reading must be met. Sensor technology is one of the most critical technologies. This is because most computers process digital signals, while the signals in the real world are analog signals. Therefore, if you want to process these analog signals, you must be inseparable from sensors. As an important part of the sensor, an analog-to-digital converter (Analog-to-Digital Converter, ADC) affects the performance of the ...

AI Technical Summary

Problems solved by technology

[0004] However, almost all time-domain interleaved ADCs need to use calibration techniques to ensure performance. This is because time-domain interleaving techniques will cause clock mismatch between channels, and this error is very important if directly improved clock performance. difficult

In addition, random offset errors and gain errors will be introduced between each channel, which will cause large spurs in the spectrum and affect the transmission of useful signals

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