Feedforward equalization pre-emphasis circuit, processing method and USB driver

Abstract

The present invention relates to a feedforward equalization pre-emphasis circuit, a processing method and a USB driver. The circuit comprises: a first-stage amplifier (101), a voltage dividing filter network (102), a delay unit (103), a second-stage amplifier (104), and a pre-emphasis summing circuit (105). The first-stage amplifier (101) is used for amplifying an amplitude of an input signal and outputting a signal; the voltage dividing filter network (102) is used for carrying out filtering, voltage division and outputting on the signal output by the first-stage amplifier (101); the delay unit (103) is used for delaying the signal output by the voltage dividing filter network (102) and outputting the delayed signal; the second-stage amplifier (104) is used for amplifying and recovering the signal output by the delay unit (103); and the pre-emphasis summing circuit (105) is used for receiving the signal output by the first-stage amplifier (101) and the signal output by the second-stage amplifier (104), carrying out the pre-emphasis summation operation and outputting an operation result. The signal is subjected to pre-emphasis processing at an input terminal so as to avoid the problem of data loss caused by intersymbol interference of the signal in the communication channel transmission process, thereby well ensuring communication quality.

Description

technical field [0001] The invention relates to the field of USB high-speed signal processing, in particular to a feedforward equalization pre-emphasis circuit and method processing circuit, and a USB driver. Background technique [0002] In the application of USB high-speed signal transmission, due to the low-pass characteristics of the communication channel, the amplitude of the high-frequency signal sent by the transmitter will be interfered by the code stream after passing through the channel, and even data will be lost in severe cases. In order to solve this problem, the signal will be pre-emphasized at the transmitter. [0003] The pre-emphasis processing of the digital signal needs the cooperation of the clock, but the pre-emphasis processing of the analog signal cannot add the clock, adding the clock will destroy the waveform of the analog signal. Therefore, the delay processing of the analog signal needs to be carried out without destroying the waveform. High-spee...

AI Technical Summary

Problems solved by technology

[0003] The pre-emphasis processing of the digital signal requires the cooperation of the clock, but the pre-emphasis processing of the analog signal cannot add the clock, adding the clock will destroy the waveform of the analog signal

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