Patent ID: 6181365
Filing Date: 2001-01-30
Classification: H04H,H04N

Abstract:
A RF output device for CATV processing of a RF signal for transmission use in an up-stream line in a cable modem provided with a function of carrying out at least the transmission of information through a cable television line, comprising:a switch positioned between a means of controlling a prescribed output signal level and a means of performing impedance transformation, wherein an output RF signal is provided to the upstream line, said output RF signal having a nearly equal bias voltage during off-time and on-time of said switch when said switch of the RF output device being operated between one of an on-state and off-state;wherein said switch comprises a common output terminal and two transconductors in which each said output RF signal is input to an inversion input end, said signal being input to a non-inversion input end of one transconductor and non-inversion input end of the other transconductor being connected to a voltage source, said transconductors being alternately switched between one of an on-position and off-position to provide an output signal to said common output terminal.