| 摘要 |
A RF output device for CATV processing having a switch provided on the upstream line in a cable modem. Data is transmitted from each household PC through the upstream line to a base station at a final stage having the highest possible signal level so as to transmit the output of the switch to an output terminal through a buffer circuit. Thereby, the performance of the RF output device is improved and the cost of the RF output device is reduced, based upon the minimized noise level when the switch is turned to an off state, and carrier leakage is prevented without having an oscillation stopping switch present for the voltage controlled oscillator.
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