Translational switching system and signal distribution system employing same

• US 8,009,725 B2
• Filed: 01/17/2008
• Issued: 08/30/2011
• Est. Priority Date: 01/19/2007
• Status: Active Grant

• Current Assignee: Entropic Communications, LLC (SoftBank Group Corp.)
• Original Assignee: RF Magic, Inc. (Maxlinear Incorporated)
• Inventors: Bargroff, Keith, Goldblatt, Jeremy, Petrovic, Branislav
• Primary Examiner(s): Timory; Kabir A
• Application Number:
  US12/015,774
• Publication Number:
  US 20080174384A1
• Time in Patent Office: 1,321 Days
• Field of Search: 375/316, 375/220, 375/222, 375/328, 375/350
• US Class Current: 375/220
• CPC Class Codes: H04H 40/90 specially adapted for satellite broadcast receiving

Abstract

A translational switch system includes first and second translational switches, and a signal bus coupled therebetween. The first translational switch includes one or more inputs configured to receive a respective one or more first input signals, a first plurality of outputs, and a second plurality of outputs. The second translational switch includes one or more inputs configured to receive a respective one or more second input signals, a first output, and a second output. The signal bus, coupled between the first and second translational switches, includes (i) a first bus line coupled to a first one of the first plurality of outputs of the first translational switch, and to the first output of the second translational switch, and (ii) a second bus line coupled to a first one of the second plurality of outputs of the first translational switch, and to the second output of the second translational switch.

Claims

1. A translational switch system, comprising:

a first translational switch having one or more inputs configured to receive a respective one or more first input signals, a first plurality of outputs, and a second plurality of outputs, the first translational switch configured to switchably output a first frequency version of the first input signal to any of the first plurality of outputs, and to switchably output a second frequency version of the first input signal to any of the second plurality of outputs;

a second translational switch having one or more inputs configured to receive a respective one or more second input signals, a first output, and a second output, the second translational switch configured to switchably output a first frequency version of the second input signal to the first output, and to switchably output a second frequency version of the second input signal to the second output; and

a signal bus coupled between the first and second translational switch, the signal bus having a first bus line coupled to a first one of the first plurality of outputs of the first translational switch, and to the first output of the second translational switch and a second bus line coupled to a first one of the second plurality of outputs of the first translational switch, and to the second output of the second translational switch.

2. The translational switch system of claim 1,

wherein the first translation switch is configured to switchably output, on any of the first plurality of outputs, either a first frequency version of any one of the first input signals, or a null output signal, the first translational switch further configured to switchably output on the second plurality of outputs either a second frequency version of any one of the first input signals, or a null output signal.

3. The translational switch system of claim 1,

wherein the first input signal has a plurality of signals including at least a first signal and a second signal, and

wherein the first translational switch has a first output switch having a first input for receiving the first frequency version of the first signal, a second input for receiving the first frequency version of the second signal, and a plurality of outputs and a second output switch having a first input for receiving the second frequency version of the first signal, a second input for receiving the second frequency version of the second signal, and a plurality of outputs.

4. The translational switch system of claim 3, wherein at least one of the first or second output switches includes an AGC block coupled to a respective signal bus line, each AGC block operable to control the level of the signal supplied to said respective bus lines.

5. The translation switch system of claim 1, wherein the first translational switch includes an AGC circuit operable to receive and perform automatic gain control on at least one of the first input signals.

6. The translation switch system of claim 5 further comprising a variable attenuator coupled to, and located in the signal path ahead of the AGC circuit, the variable attenuator controllable by the AGC circuit to set the input signal level of the one or more first input signals supplied to the first translational switch.

7. The translation switch system of claim 1, wherein the first translational switch includes an AGC circuit operable to receive and perform automatic gain control on at least one of the first or second frequency versions of the first input signals.

8. The translational switch system of claim 1, wherein the electrical length of each of the first and second signal bus lines is less than one quarter wavelength of the highest frequency signal propagated there along.

9. The translational switch system of claim 8, wherein each of the first and second signal bus lines are terminated in a high impedance.

10. The translational switch system of claim 1,

wherein the electrical length of the connection between the first signal bus line and the first translational switch and between the first signal bus line and the second translational switch is less than one quarter wavelength of the highest frequency signal propagated there along, and

wherein the electrical length of the connection between the second signal bus line and the first translational switch and between the second signal bus line and the second translational switch is less than one quarter wavelength of the highest frequency signal propagated there along.

11. The translational switch system of claim 9,

wherein the first signal bus line exhibits a characteristic impedance, and wherein the first signal bus line is terminated by a load having an impedance which substantially matches the characteristic impedance of the first signal bus line, and

wherein the second signal bus line exhibits a characteristic impedance, and wherein the second signal bus line is terminated by a load having an impedance which substantially matches the characteristic impedance of the second signal bus line.

12. The translational switch system of claim 1, wherein in the second translational switch, the first output is included within a first plurality of outputs, and the second output is included within a second plurality of outputs, the second translational switch configured to switchably output a first frequency version of the second input signal to any of the first plurality of outputs, and to switchably output a second frequency version of the second input signal to any of the second plurality of outputs.

13. The translational switch system of claim 12, wherein the signal bus further comprises:

a third bus line coupled to a second one of the first plurality of outputs of the first translational switch, and to a second one of the first plurality of outputs of the second translational switch; and

a fourth bus line coupled to a second one of the second plurality of outputs of the first translational switch and to a second one of the second plurality of outputs of the second translational switch.

14. The translational switch system of claim 13,

wherein the first and third bus lines are each operable to support the propagation of the first frequency version of the first or second input signals there along;

wherein the second and fourth bus lines are each operable to support the propagation of the second frequency version of the first or second input signals there along; and

wherein the first and third bus lines are interleaved with the second and fourth bus lines.

15. The translational switch system of claim 12, wherein the second translational switch is configured to switchably output on the first plurality of outputs either a first frequency version of any of the second input signals, or a null output signal, the second translational switch further configured to switchably output on the second plurality of outputs either a second frequency version of any one of the second input signals, or a null output signal.

16. The translational switch system of claim 12,

wherein the second input signal comprises a plurality of signals including at least a first signal and a second signal, and

wherein the second translational switch has a first output switch having a first input for receiving the first frequency version of the first signal, a second input for receiving the first frequency version of the second signal, and a plurality of outputs;

and a second output switch, the second output switch having a first input for receiving the second frequency version of the first signal, a second input for receiving the second frequency version of the second signal, and a plurality of outputs.

17. The translational switch system of claim 12, wherein each of the first and second output switches of each of the first and second translational switches comprises a discrete circuit.

18. The translation switch system of claim 12, wherein the second translational switch includes an AGC circuit coupled to receive and perform automatic gain control on at least one of the second input signals.

19. The translation switch system of claim 12, wherein the second translational switch includes an AGC circuit coupled to receive and perform automatic gain control on at least one of the first or second frequency versions of the second input signals.

20. The translational switch system of claim 1, further comprising a third translational switch having one or more inputs configured to receive a respective one or more third input signals, a first output, and a second output, the third translational switch configured to switchably output a first frequency version of the third input signal to the first output, and to switchably output a second frequency version of the third input signal to the second output.

21. The translational switch system of claim 20, wherein the signal bus further comprises:

a third bus line coupled to a second one of the first plurality of outputs of the first translational switch, and to the first output of the third translational switch; and

a fourth bus line coupled to a second one of the second plurality of outputs of the first translational switch and to the second output of the third translational switch.

22. The translational switch system of claim 21,

wherein the first and third bus lines are each operable to support the propagation of the first frequency version of the first or second input signals there along;

wherein the second and fourth bus lines are each operable to support the propagation of the second frequency version of the first or second input signals there along; and

wherein the first and third bus lines are interleaved with the second and fourth bus lines.

23. A system operable to construct a composite signal, the system comprising:

a translational switching system as claimed in claim 1; and

a signal combiner having a first input coupled to the first signal bus line, a second input coupled to the second bus line, and an output for providing a composite output signal.

24. A system operable to construct a composite signal, the system comprising:

a first receive module for coupling one or more first input signals to the first translational switch;

a second receive module for coupling one or more second input signal to the first translational switch;

a translational switching system as claimed in claim 1;

a first filter having an input coupled to the first bus line, and an output;

a second filter having an input coupled to the second bus line, and an output; and

a signal combiner having a first input coupled to the first filter output, a second input coupled to the second filter output, and an output for providing a composite output signal.