A kind of emi automatic adjustment device and emi automatic adjustment method

Abstract

The present invention provides an EMI automatic adjustment device and an EMI automatic adjustment method. The EMI automatic adjustment device comprises a crystal oscillator, a jitter clock generation unit, a PLL circuit, a spectrum spreading direction and scope configuration unit, a clock random number generation unit, a configuration random number generation unit, a configuration information control unit, a random seed generation unit, a high precision temperature ADC sensor, a change cycle configuration storage unit, a random number switch unit, a configuration information storage unit, and an EMI monitoring unit. EMI is automatically checked, or the spectrum spreading processing of PLL is carried out according to a configured EMI frequency point, the spectrum spreading operation of a clock is carried out through a configurable frequency spreading direction, thus original spectral energy spike is flattened, and an EMI problem is solved.

Description

technical field [0001] The invention relates to a chip design, in particular to an EMI automatic adjustment device for a chip and an EMI automatic adjustment method. Background technique [0002] EMI (Electromagnetic Interference, Electromagnetic Interference) refers to the interference source coupling (interference) its signal to another electrical network through the medium. In chip design, high-speed PCB and system design, high-frequency signal lines, integrated circuit traces and pins, various types of connectors, etc. may become sources of interference, affecting the normal operation of other systems or other subsystems in the system. [0003] As the operating frequency of SOC chips becomes higher and higher, EMI has become an important factor affecting chip performance. However, in the current technology, the spectral energy of the clock is usually transferred or pulled down by changing the frequency or forcibly increasing the jitter (clock jitter) of the clock. Howev...

AI Technical Summary

Problems solved by technology

But in the current technology, usually by changing the frequency or forcibly increasing the jitter (clock jitter) of the clock to transfer or lower the spectrum energy of the clock, but this kind of disadvantage is also obvious, changing the frequency will affect the performance of the chip, Especially some circuits sensitive to frequency, such as some communication interface circuits

Then forcibly increasing the jitter of the clock can level the spectrum energy and reduce it, but the degradation of the clock quality will also obviously have a negative impact on the circuit performance, and this impact exists at all frequencies

Images