High-speed serial transmission circuit and power supply jitter compensation circuit thereof

Abstract

The invention provides a high-speed serial transmission circuit and a power supply jitter compensation circuit thereof. In the power supply jitter compensation circuit, if a continuous data judgment circuit judges that effective data to be transmitted by a high-speed serial transmission circuit is in a continuous fixed numerical value state, compensation data output by a compensation data generation circuit jump, and the compensation data are output to the input end of a compensation data pre-driving circuit. As the positive and negative electrodes of the power supply end of the compensation data pre-driving circuit and the positive and negative electrodes of the power supply end of the effective data pre-driving circuit have the same connection mode and are connected with the power supplyand the ground, the compensation data pre-driving circuit is used for enhancing the compensation data, and the load matching circuit is used for matching a parasitic load capacitor of a main drivingcircuit in the high-speed serial transmission circuit, the high-speed serial transmission circuit periodically charges and discharges the power supply and the ground when transmitting effective data,the noise of the power supply can be suppressed, the jitter of the power supply can be reduced, and the output signal quality of the circuit can be improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and more specifically relates to a high-speed serial transmission circuit and a power supply jitter compensation circuit thereof. Background technique [0002] In the high-speed serial transmission circuit of integrated circuits, its power supply is not an ideal power supply device, and there are parasitic resistance, inductance and capacitance in the power supply path. Due to the randomness of the sent data, the internal circuit charges and discharges its power supply and ground relatively randomly, and under the action of parasitic inductance, resistance and capacitance, the power supply and ground of the entire circuit will be relatively different as the data changes. Large jitter will increase the jitter of the output data and degrade the signal quality. [0003] For example, the sending data is 1010110011111100000, the time length of each bit is T, and an inverter sends the data, ...

AI Technical Summary

Problems solved by technology

If the waveform of the sent data is relatively random, the interval of charging and discharging is relatively random, and the power supply of the circuit jitters strongly, making the output signal quality low

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