Universal serial bus signal test device
View Patent ↗A universal serial bus (USB) signal test device includes a printed circuit board. A first connector, a second connector, and a number of USB hub integrated circuit (ICs) are arranged on the printed circuit board. The USB hub ICs are connected in series. A USB signal is passed through the USB hub ICs and an auxiliary test device in that order. The USB signals are measured with an oscilloscope after being passed through the USB hub ICs and the auxiliary test device.
1. A universal serial bus (USB) signal test device, comprising:
a printed circuit board (PCB);
a first connector arranged on the PCB and connectable to a test device to receive USB signals from the test device;
a plurality of USB hub integrated circuits (ICs) connected in series, wherein each of the USB hub IC comprises a first group of pins and a second group of pins; the first group of pins of a first one of the plurality of USB hub ICs is connected to the first connector, the first group of pins of another USB hub IC is connected to the second group of pins of an adjacent previous USB hub IC;
a second connector connected to the second group of pins of a last one of the plurality of USB hub ICs to output the USB signals;
a power connector connected to a power pin of each of the plurality of USB hub ICs;
a clock generator connected to a clock pin of each of the plurality of USB hub ICs.
2. The USB signal test device of claim 1 , further comprising a plurality of USB connectors, wherein each of the plurality of USB hub ICs comprises a third group of pins, the third group of pins of each USB hub IC is connected to a corresponding one of the plurality of USB connectors.
3. The USB signal test device of claim 1 , wherein the connection of the first and second groups of pins of the plurality of USB hub ICs are through traces on the PCB.