| 摘要 |
There is provided an amplifier device (30) for a CATV network comprising a first amplifier element (38) for upstream signals and a second amplifier element (36) for downstream signals, wherein the first and second amplifier elements (38, 36) are disposed between first and second directional couplers (34, 32). The combined isolation of the first and second directional couplers (34, 32) is greater than the sum of the gain of the first and second amplifier elements (38, 36). The first directional coupler (34) has one port (40) attached to an input (42) of the downstream amplification element (36) and one port (44) attached to an output (46) of an upstream amplification element (38) and the second directional coupler (32) has one port (150) attached to an output (52) of the downstream amplifier (36) and one port (54) attached to an input (56) of the upstream amplifier (38). |
