Low voltage differential signal driving circuit and electronic device compatible with wired transmission

摘要

A low voltage differential signal driving circuit including positive and negative differential output terminals, an automatic level selector, an output level detector and a transition accelerator. The positive and negative differential output terminals provide a transmission interface with a differential output signal for transmission of a data signal. The automatic level selector outputs a reference voltage corresponding to the transmission interface. The output level detector generates a low-high (or high-low) transition acceleration control signal based on the data signal, the reference voltage, and VTXP signal at the positive differential output terminal (or VTXN signal at the negative differential output terminal). In accordance with the low-high (or high-low) transition acceleration control signal, the transition accelerator couples the positive (or negative) differential output terminal to a high voltage source and couples the negative (or positive) differential output terminal to a low voltage source to accelerate transition of the differential output signal.

主权项

1. A low voltage differential signal driving circuit, comprising:
a positive differential output terminal and a negative differential output terminal, coupled to a transmission interface to provide the transmission interface with a differential output signal according to a first data signal and a second data signal; an automatic level selector, outputting a reference voltage corresponding to the transmission interface; an output level detector, generating a low-high transition acceleration control signal based on the first data signal, the reference voltage, and a VTXP signal at the positive differential output terminal; and a transition accelerator, coupling the positive differential output terminal to a high voltage source and coupling the negative differential output terminal to a low voltage source in accordance with the low-high transition acceleration control signal, wherein: the output level detector further generates a high-low transition acceleration control signal based on the second data signal, the reference voltage, and a VTXN signal at the negative differential output terminal; and the transition accelerator further couples the positive differential output terminal to the low voltage source and couples the negative differential output terminal to the high voltage source in accordance with the high-low transition acceleration control signal.