Signal Amplifiers Having Non-Interruptible Communication Paths

• US 20090047917A1
• Filed: 09/11/2008
• Published: 02/19/2009
• Est. Priority Date: 03/10/2005
• Status: Active Grant

• Current Assignee: Digicomm International LLC
• Original Assignee: CommScope Inc. (CommScope Holding Company, Inc.)
• Inventors: Shen, Fu-Chin, Phillips, Neil P., Su, Sou-Pen
• Granted Patent: US 7,912,431 B2
• Time in Patent Office: Days
• US Class Current: 455/127.100
• CPC Class Codes: H03F 2200/63 the amplifier being suitable for CATV applications
• CPC Class Codes: H03F 2203/7227 the gated amplifier being switched on or off by a switch in the supply circuit of the amplifier
• CPC Class Codes: H03F 3/191 Tuned amplifiers H03F3/193, H03F3/195 take precedence
• CPC Class Codes: H03F 3/62 Two-way amplifiers
• CPC Class Codes: H03F 3/72 Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal

Abstract

RF signal amplifiers are provided that include an RF input port, a first RF output port, a second RF output port and a power input for receiving electrical power. These amplifiers include a first communication path between the RF input port and the first RF output port that has a power amplifier that amplifies signals that are transmitted from the RF input port to the first RF output port. These amplifiers also have a second non-interruptible communication path between the RF input port and the second RF output port. The amplifiers further include a selective termination circuit that is configured to pass signals between the RF input port and the first RF output port over the first communication path when electrical power is received at the power input and to terminate the first communication path to a matched termination when an electrical power feed to the power input is interrupted.

Claims

1. A bi-directional RF signal amplifier, comprising

an RF input port;

a first RF output port;

a second RF output port;

a power input for receiving electrical power;

a first communication path between the RF input port and the first RF output port, the first communication path including a power amplifier that is configured to amplify signals that are transmitted from the RF input port to the first RF output port via the first communication path;

a second non-interruptible communication path between the RF input port and the second RF output port;

a selective termination circuit that is configured to pass signals between the RF input port and the first RF output port over the first communication path when electrical power is received at the power input and that is further configured to terminate the first communication path to a matched termination when an electrical power feed to the power input is interrupted.

2. The bi-directional RF signal amplifier of claim 1, wherein the selective termination circuit comprises a relay having an input terminal, a first output terminal and a second output terminal, wherein the first output terminal of the relay is coupled to the power amplifier and the second output terminal of the relay is connected to the matched termination.

3. The bi-directional RF signal amplifier of claim 2, further comprising a directional coupler having an input that is connected to the RF input port, a first output that is connected to the input terminal of the relay and a second output that is connected to the second non-interruptible communication path.

4. The bi-directional RF signal amplifier of claim 3, wherein the matched termination comprises a resistor that is terminated to a ground voltage.

5. The bi-directional RF signal amplifier of claim 3, further comprising a power regulation circuit that receives electrical power from the power input and that outputs a power supply voltage, wherein the power supply voltage is coupled to the power amplifier and to the relay.

6. The bi-directional RF signal amplifier of claim 5, wherein the directional coupler splits an input signal evenly between its first output and its second output.

7. The bi-directional RF signal amplifier of claim 5, wherein the directional coupler splits an input signal unevenly so as to pass more signal energy to its first output than is passed to its second output.

8. The bi-directional RF signal amplifier of claim 1, wherein the power amplifier comprises a first power amplifier, and wherein the first communication path includes a forward path from the RF input port to the first RF output port and a reverse path from the first RF output port to the RF input port, and wherein the reverse path includes a second power amplifier.

9. The bi-directional RF signal amplifier of claim 8, wherein the second amplifier has a gain that is different than a gain of the first power amplifier.

10. The bi-directional RF signal amplifier of claim 8, wherein the first communication path further comprises a first diplexer that is between the first output terminal of the relay and the first power amplifier and a second diplexer that is between the first power amplifier and the first RF output port.

11. The bi-directional RF signal amplifier of claim 10, further comprising a power dividing circuit having an input and a plurality of outputs that is between the second diplexer and the first RF output port, wherein the first RF output port is connected to one of the plurality of outputs of the power dividing circuit.

12. The bi-directional RF signal amplifier of claim 1, wherein the second RF output port comprises a voice-over-IP RF output port.

13. An RF signal amplifier, comprising

an RF input port;

a first RF output port;

a second RF output port;

a relay having an input terminal, a first output terminal and a second output terminal;

a directional coupler having an input that is connected to the RF input port, a first output that is connected to the input terminal of the relay and a second output that is connected to the second RF output port;

a power amplifier that is provided between the first output terminal of the relay and the first RF output port; and

a resistive termination that is coupled to the second output terminal of the relay.

14. The RF signal amplifier of claim 13, wherein the resistive termination comprises a resistor that is terminated to a ground voltage.

15. The RF signal amplifier of claim 13, further comprising a first diplexer that is between the first output terminal of the relay and the power amplifier and a second diplexer that is between the power amplifier and the first RF output port.

16. The RF signal amplifier of claim 15, wherein the power amplifier comprises a first power amplifier, and wherein the RF signal amplifier further comprises a second power amplifier that is between the first diplexer and the second diplexer, wherein the first power amplifier is configured to amplify signals that are carried from the first diplexer to the second diplexer and wherein the second power amplifier is configured to amplify signals that are carried from the second diplexer to the first diplexer.

17. The RF signal amplifier of claim 16, further comprising a power dividing circuit having an input and a plurality of outputs that is between the second diplexer and the first RF output port, wherein the first RF output port is connected to one of the plurality of outputs of the power dividing circuit.

18. The RF signal amplifier of claim 13, wherein the relay is configured so that the input of the relay is connected to the first output of the relay when a power input terminal of the relay receives electrical power, and wherein the relay is configured so that the input of the relay is connected to the resistive termination when an electrical power feed to the power input terminal is interrupted.

19. A method of providing a non-interruptible communication path through a signal amplifier that includes an RF input port and a plurality of RF output ports, the method comprising:

using a directional coupler to split a signal received at the RF input port into a first signal component and a second signal component;

passing the first signal component to a first of the plurality of output ports via a first communication path that includes an amplifier;

passing the second signal component to a second of the plurality of output ports via a second non-interruptible communication path; and

passing the first signal component to a matched resistive termination in response to interruption of an electrical power feed to the signal amplifier.

20. A bi-directional RF signal amplifier, comprising

an RF input port;

an RF output port;

a power input for receiving electrical power;

a first communication path between the RF input port and the RF output port, the first communication path including a power amplifier that is coupled to the power input and that is configured to amplify signals that are transmitted from the RF input port to the RF output port via the first communication path;

a second non-interruptible communication path between the RF input port and the RF output port; and

at least one circuit element that is configured to connect the RF input port to the RF output port via the first communication path when electrical power is available at the power input and to connect the RF input port to the RF output port via the second non-interruptible communication path when electrical power is unavailable at the power input, wherein the at least one circuit element comprises a relay that selectively connects the RF input port to one of the first communication path and the second non-interruptible communication path and a directional coupler that connects the first communication path and the second non-interruptible communication path to the RF output port.

21. The bi-directional RF signal amplifier of claim 20, wherein the first communication path includes a power dividing circuit having an input and a plurality of outputs, and wherein the directional coupler is between a first of the plurality of outputs of the dividing circuit and the RF output port.

22. A bi-directional RF signal amplifier, comprising

an RF input port;

a first diplexer having an input that receives signals from the first RF input port and a high frequency output and a low frequency output;

a relay having an input, a first output and a second output, wherein the input of the relay receives the high frequency output of the first diplexer;

a power amplifier having an input that is connected to the first output of the relay;

a second diplexer that includes a high frequency input that receives an output of the power amplifier and the second output of the relay and a low frequency input that receives the low frequency output of the first diplexer;

an RF output port that is coupled to an output of the second diplexer; and

a power input for receiving electrical power.

23. The bi-directional RF signal amplifier of claim 22, further comprising a second relay and a second power amplifier coupled between the low frequency input of the second diplexer and the low frequency output of the first diplexer.

24. The bi-directional RF signal amplifier of claim 22, wherein the relay and the power amplifier are implemented together as part of a single integrated circuit chip, and wherein the output of the power amplifier and the second output of the relay are combined on the integrated circuit chip so that a single pin of the integrated circuit chip is connected to the high frequency input of the second diplexer.