Method for reducing delay difference of differential transmission and system thereof
AssigneeHuawei Technologies Co., Ltd.
InventorsGongxian JIA, Lun WANG, Chunxing HUANG
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Abstract
The present invention discloses a system and method for reducing delay difference of differential transmission, a certain delay difference between waveforms of the P signal and N signal is generated through controlling delay adjustment to P signal or N signal of the differential signals and controlling delay adjustment value simultaneously, to compensate for the delay difference of differential transmission due to the channels. Therefore, the present invention can reduce the delay difference of differential transmission due to property discrepancy of board materials and delay inconsistency among pins of the connectors, and at same time simplify the scheme design.
Claims19
A system for reducing delay difference of differential transmission comprising:
- a first cross-point switch, adapted to receive a positive signal and a negative signal of a differential signal, switch one of the positive signal and the negative signal as a first signal to a delay adjustment device for delay adjustment, and switch the other one of the positive signal and the negative signal as a second signal output;
- the delay adjustment device, adapted to perform delay adjustment to the first signal to obtain an adjusted first signal;
- a delay adjustment controlling device, adapted to obtain a delay difference between the second signal and the adjusted first signal, determine control information according to the delay difference, and transmit the control information to the delay adjustment device for controlling latter delay adjustment of the delay adjustment device,
- wherein, when the delay difference between the second signal and the adjusted first signal is larger than a preset value, the first cross-point switch switches to transmit the second signal to the delay adjustment device for delay adjustment.
A method for reducing delay difference of differential transmission comprising:
- receiving, by a first cross-point switch, a positive signal and a negative signal of differential signals, switching one of the positive signal and the negative signal as a first signal to a delay adjustment device for delay adjustment, and switching the other one of the positive signal and the negative signal as a second signal output;
- performing, by the delay adjustment device, delay adjustment to the first signal to obtain an adjusted first signal;
- obtaining, by a delay adjustment controlling device, a delay difference between the second signal and the adjusted first signal, determining control information according to the delay difference, and transmitting the control information to the delay adjustment device for controlling latter delay adjustment of the delay adjustment device;
- and
- when the delay difference between the second signal and the adjusted first signal is larger than a preset value, the first cross-point switch switching to transmit the second signal to the delay adjustment device for delay adjustment.
Dependencies are inferred from the claim text.