Patent ID: 9483435
Filing Date: 2016-11-01
CPC Classification: G06F

Claim Text:
1. A Universal Serial Bus (USB) transceiver for a USB controller, wherein the USB transceiver detects a high-speed (HS) disconnect between the USB controller and a device connected to the USB controller, the USB transceiver comprising: a reference-voltage generation circuit for generating a HS disconnect reference-voltage signal and a transmitter reference-voltage signal, wherein the HS disconnect and transmitter reference-voltage signals have a constant voltage difference therebetween; a current driver having an input terminal connected to the reference-voltage generation circuit for receiving the transmitter reference-voltage signal, and first and second output terminals for outputting first and inverted first voltage signals, respectively; a first comparator having first and second input terminals connected to the first and second output terminals of the current driver for receiving the first and inverted first voltage signals, respectively, and an output terminal for outputting a control voltage signal; a multiplexer having first and second input terminals connected to the first and second output terminals of the current driver for receiving the first and inverted first voltage signals, respectively, a select input terminal connected to the output terminal of the first comparator for receiving the control voltage signal, and an output terminal for outputting a selected one of the first and inverted first voltage signals; and a second comparator having a first input terminal connected to the output terminal of the multiplexer for receiving the selected one of the first and inverted first voltage signals, a second input terminal connected to the reference-voltage generation circuit for receiving the HS disconnect reference-voltage signal, and an output terminal for outputting a HS disconnect output voltage signal when the selected one of the first and inverted first voltage signals is greater than the HS disconnect reference-voltage signal, thereby detecting the HS disconnect between the USB controller and the device.