Patent ID: 7474117

Claim:
A method of transmitting signal on a bi-directional universal serial bus booster circuit comprising: connecting an input terminal to a universal serial bus; coupling a first inverting buffer in series with said input terminal; coupling a second inverting buffer directly in series with said first inverting buffer; forming a non-inverting buffer with said first inverting buffer and said second inverting buffer; coupling a resistor-capacitor (“RC”) passive filter in series with said second buffer; connecting an output terminal to said RC passive filter wherein said output terminal is configured to connect with said universal serial bus; coupling a first resistor directly in series with said input terminal and said first inverting buffer; coupling a second resistor directly in series with said second inverting buffer circuit and said RC pass filter; wherein said first resistor, said second resistor and said RC passive filter are arranged to create positive feedback with respect to the input terminal; and wherein said RC passive filter limits modification of signals on said universal serial bus to signals with high-speed edge rates without affecting slow speed signaling, full speed signaling and special bus events on said universal serial bus.