Sigmastar Technology Ltd.

Tian-Li Qu

Zhen-Yang Pang

Si-Xin Hong

A transmitter includes a level shifter circuit, an edge adjustment circuit and a driver. The level shifter circuit generates first signals and second signals based on an input signal, wherein a voltage range of the input signal, a voltage range of the first signals, and a voltage range of the second signals are different from each other. The edge adjustment circuit adjusts a level of a first node and a level of a second node according to the first signals and the second signals, and provides an overvoltage protection during the adjustment of the level of the first node and the level of the second node. The driver generates an output signal according to the level of the first node and the level of the second node.

Transmitter with overvoltage protection

A voltage mode transmitter circuit includes a low-dropout (LDO) regulator and an output circuit. The LDO regulator generates a driving voltage. The output circuit generates an output signal, and includes: a termination resistor, transmitting the output signal; a data processing circuit, driven by the driving voltage and adjusting a level of a node according to first and second data signals; a pre-emphasis circuit, transmitting a supply voltage to the node according to a control signal to adjust a transition edge of the output signal; a voltage protection circuit, providing an overvoltage protection according to a bias voltage, and coupling the node to the termination resistor. The data processing circuit, the pre-emphasis circuit, and the voltage protection circuit include at least one transistor, and a highest level of the output signal is higher than a withstand voltage of the at least one transistor.

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Shanghai, China

Tian-Li Qu