A MULTIPLEXER WITH SWITCHABLE FILTER
A diplexer filter having an upstream port, a downstream port and a Cable connector port forms a first transfer function for a first radio frequency (RF) signal that is coupled from the upstream port to the Cable connector port and a second transfer function for a second RF signal that is coupled from the Cable connector port to the downstream port. It includes a first filter (F 1 ) when the first transfer function is applied and a second filter (F 2 ) when the first transfer function is applied. A third filter (F 3 ) coupled via a switch for selectively coupling said third filter to combine a transfer function of the third port with a transfer function of the first filter, when the Data Over Cable Service Interface Specification (DOCSIS) 3.1 is selected, and for selectively coupling the third filter to combine the transfer function of the third filter with a transfer function of the second filter, when the DOCSIS 3.0 is selected.
1 - 12 . (canceled)
13 . A receiver comprising a multiplexing filter, the multiplexing filter having a first port, a second port and a third port, comprising:
a first filter having a first frequency range and coupled between said first and third ports for applying a first transfer function to a first radio frequency signal from said first port to said third port;
a second filter having a second frequency range and coupled between said second and said third ports for applying a second transfer function to a second RF signal from said third port to said second port;
a switch being configured to be set in least a first and a second position according to a control signal for selecting a first or a second configuration mode of said multiplexing filter;
a third filter having a third frequency range in between said first and said second frequency range, said third filter being configured to be coupled, when said switch is in said first position, between said third port and said second port, thereby extending the first frequency range with the second frequency range through overlapping roll-off regions of said first filter and said third filter, and when said switch is in said second position, between said first port and said third port, thereby extending the third frequency range with the second frequency range through overlapping roll-off regions of said third filter and said second filter.
14 . The receiver comprising a multiplexing filter according to claim 13 , wherein said first configuration mode of said multiplexing filter corresponds to Data Over Cable Service Interface Specification 3.1 and said second configuration mode of said multiplexing filter corresponds to Data Over Cable Service Interface Specification 3.0.
15 . The receiver comprising a multiplexing filter according to claim 14 , wherein said multiplexing filter comprises a diplexer filter, said third port comprises a cable connector for connecting said cable connector to a transmission line that may be coupled to a cable provider, said first port is an upstream port and said second port is a downstream port.
16 . The receiver comprising a multiplexing filter according to claim 13 , further comprising a first delay network coupled in series with at least one of said first and second filters for matching a propagation delay via said third filter and a propagation delay via said at least one of said first and second filters.
17 . The receiver comprising a multiplexing filter according to claim 16 , further comprising a second delay network coupled in series with the other one of said first and second filters for matching a propagation delay via said third filter and via said other one of said first and second filters.