High-speed rising edge/falling edge adjustable circuit with programmable amplitude and phase

Abstract

The invention provides a high-speed rising edge / falling edge adjustable circuit with programmable amplitude and phase. A rising edge adjusting circuit and a falling edge adjusting circuit are respectively provided with a delay phase adjusting module for controlling phase positions of a rising edge and a falling edge to be subjected to amplitude adjustment; the phase positions of the rising edge and the falling edge subjected to amplitude adjustment are subjected to logical exclusive-OR operation with the input signal through a high-speed exclusive-OR module to generate a rising edge adjustmentphase signal and a falling edge adjustment phase signal; the rising edge adjusting circuit and the falling edge adjusting circuit are respectively provided with a phase amplitude adjusting module, and the rising edge adjusting phase signal and the falling edge adjusting phase signal perform logical OR operation with the phase amplitude adjusting module to control the amplitude of amplitude adjustment of the rising edge and the falling edge; the input signal also generates an original signal through a high-speed main path; and logic AND operation is performed on the original signal, the risingedge adjustment phase signal and the falling edge adjustment phase signal, and the amplitude of the main signal at the phase position is adjusted.

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 eye diagram is a series of digital signals accumulated and displayed on the oscilloscope. It contains a wealth of information. From the eye diagram, the influence of intersymbol crosstalk and noise can be observed, which reflects the overall characteristics of the digital signal, so as to estimate the system optimization. Therefore, eye diagram analysis is the core of signal integrity analysis for high-speed interconnect systems. [0003] The quality of the eye diagram is also the most important performance index to measure the high-speed laser driver. The faster the rising and falling edges of the eye diagram, the larger the opening of the eye diagram, the better the transmittable signal and bit error rate tolerance. Therefore, in the design of high-speed laser drivers, improving th...

AI Technical Summary

Problems solved by technology

Setting the appropriate gear can reduce the jitter of the eye diagram and increase the opening of the eye diagram; however, the pre-emphasis circuit reduces the extinction ratio, and it is necessary to increase the modulation current to compensate the extinction ratio and increase the total power consumption of the chip. SFP+ high-speed laser driver Strict requirements on power consumption

Images