Signal splitter for use in MoCA/CATV networks

• US 9,209,774 B2
• Filed: 09/09/2011
• Issued: 12/08/2015
• Est. Priority Date: 09/14/2010
• Status: Active Grant

• Current Assignee: Technetix Group Limited
• Original Assignee: Technetix Group Limited
• Inventors: Rijssemus, Martien
• Primary Examiner(s): Pascal, Robert
• Assistant Examiner(s): GLENN, KIMBERLY E
• Application Number:
  US13/816,023
• Publication Number:
  US 20130181789A1
• Time in Patent Office: 1,551 Days
• Field of Search: 333/131, 333/124, 333/25, 333/26
• US Class Current: 1/1
• CPC Class Codes: H03H 7/06 including resistors H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence
• CPC Class Codes: H03H 7/1791 Combined LC in shunt or branch path
• CPC Class Codes: H03H 7/42 Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns
• CPC Class Codes: H03H 7/482 particularly adapted for use in common antenna systems
• CPC Class Codes: H04N 7/104 Switchers or splitters

Abstract

There is provided a splitter circuit means for use with a CATV network comprising a signal input (34) in communication with a transformer or balun (32) to supply two signal outputs (36, 38), with a resistor (52) connected in parallel between the outputs (36, 38) and wherein additional capacitive, inductive and resistive elements (48, 50, 52, 54) are associated with the resistor (42), thereby to give an insertion loss in to out in the range of 3 to 10 dB and isolation 10 out to out of <17 dB for signal frequencies in the range 1125 MHz to 1700 MHz, while at the same time maintaining good RF performance in the frequency range 5 MHz to 1000 MHz.

Claims

1. A splitter circuit for use with a CATV network comprising a signal input in communication with a transformer or balun to supply two signal outputs, with a first resistor connected in parallel between the outputs and wherein a filter unit connected in series with the first resistor comprises a single inductive element, two capacitive elements and a second resistor connected in parallel with the first resistor, thereby to give an in-to-out insertion loss in the range of 3 to 10 dB, for signal frequencies in the range 1125 MHz to 1700 MHz.

2. A splitter circuit according to claim 1, wherein the two capacitive elements are in series with each other and in parallel with the second resistor and inductive element.

3. A splitter circuit according to claim 1, wherein the single inductive element has an inductance in the range 10 to 20 nH.

4. A splitter circuit according to claim 1, wherein the first capacitive element has a capacitance in the range 2 pF to 5 pF with the second capacitive element having a capacitance in the range 0.1 pF to 3 pF.

5. A splitter circuit according to claim 1, wherein the second resistor has a resistance in the range 100 to 50 Ohm.

6. A splitter circuit according to claim 1, wherein the splitter circuit has an in-to-out insertion loss in the range 3 to 6 dB for signal frequencies in the range 5 MHz to 1000 MHz.

7. A splitter circuit according to claim 1, having an isolation out to out of <

17 dB for frequencies in the range 1125 MHz to 1700 MHz.

8. A signal splitter incorporating at least one splitter circuit according to claim 1.

9. A cable television network incorporating one or more splitter circuit according to claim 1.

10. A splitter circuit for use with a CATV network comprising a signal input in communication with a transformer or balun to supply two signal outputs, with a first resistor connected in parallel between the outputs and a filter unit connected in series with the first resistor, wherein the filter unit comprises a single inductive element, two capacitive elements, and a second resistor, wherein the single inductive element is in parallel with a first capacitive element of the two capacitive elements and the second resistor is in parallel with a second capacitive element of the two capacitive elements, thereby to give an in-to-out insertion loss in the range of 3 to 10 dB, for signal frequencies in the range 1125 MHz to 1700 MHz.

11. A splitter circuit according to claim 10, wherein the two capacitive elements are in series with each other.

12. A splitter circuit according to claim 10, wherein the single inductive element has an inductance in the range 10 to 20 nH.

13. A splitter circuit according to claim 10, wherein the first capacitive element has a capacitance in the range 0.1 pF to 3 pF and the second capacitive element has a capacitance in the range 2 pF to 5 pF.

14. A splitter circuit according to claim 10, wherein the second resistor has a resistance in the range 100 to 50 Ohm.

15. A splitter circuit according to claim 10, wherein the splitter circuit has an in-to-out insertion loss in the range 3 to 6 dB for signal frequencies in the range 5 MHz to 1000 MHz.

16. A splitter circuit according to claim 10, having an isolation out to out of <

17 dB for frequencies in the range 1125 MHz to 1700 MHz.

17. A signal splitter incorporating at least one splitter circuit according to claim 10.

18. A cable television network incorporating one or more splitter circuit according to claim 10.