Multi-dimensional signal eye pattern compensation circuit

Abstract

The invention provides a multi-dimensional signal eye pattern compensation circuit, and the circuit is characterized in that a rising edge adjustment path and a falling edge adjustment path are respectively provided with detection circuits which are used for extracting a rising edge / falling edge pulse signal with a certain width in an input signal; a rising edge / falling edge pre-emphasis compensation signal or a rising edge / falling edge de-emphasis compensation signal is generated after the rising edge / falling edge pulse signal with a certain width passes through the MUX selector; and the rising edge / falling edge pre-emphasis compensation signal or the rising edge / falling edge de-emphasis compensation signal is weighted with the input signal on the high-speed main signal path, and the amplitudes of the rising edge and the falling edge of the input signal at the corresponding rising edge / falling edge pulse signal are adjusted. According to the multi-dimensional signal eye pattern compensation circuit, the phases, the amplitudes and the pre-emphasis directions of the rising edge and the falling edge of the eye pattern can be adjusted respectively, four-dimensional eye pattern compensation is presented, and the opening degree and the symmetry of the eye pattern are improved.

Description

technical field [0001] The present invention relates to integrated circuits, and more particularly to the adjustment of phase and amplitude of digital signals. Background technique [0002] The improvement of signal quality has always been an important topic in the field of communication engineering and high-speed signal circuit design. Signal quality is generally judged by measuring the quality of the eye diagram, including the time of rising and falling edges of the eye diagram, jitter, Margin, DCD and other indicators. It can be summarized as the opening degree and symmetry of the eye diagram. [0003] After the signal passes through the transmission medium, the quality of the signal and eye diagram will degrade, which will affect the signal judgment and increase the bit error rate. The explanation in the frequency domain is: the signal transmission medium exhibits low-pass filter characteristics, the high-frequency components of the signal are attenuated greatly during ...

AI Technical Summary

Problems solved by technology

[0009] The present invention provides a multi-dimensional signal eye diagram compensation circuit, aiming to solve the problem of insufficient eye opening and symmetry caused by signal attenuation in the prior art

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