DUPLEXER AND SWITCH ENHANCEMENT

• US 20100278085A1
• Filed: 04/29/2009
• Published: 11/04/2010
• Est. Priority Date: 04/29/2009
• Status: Active Grant

• Current Assignee: Intersil Americas LLC (Renesas Electronics Corporation)
• Original Assignee: Quellan, Inc. (Renesas Electronics Corporation)
• Inventors: Hahn, Wilhelm Steffen
• Granted Patent: US 8,422,412 B2
• Time in Patent Office: Days
• US Class Current: 370/286
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver

Abstract

A signal selector enhancer suitable for portable electronic devices and base stations is disclosed. In one embodiment, the enhancer can include: a filter for receiving a signal from a first node, and for providing a filtered signal output therefrom, where the first node is coupled to a signal selector; and a noise canceller for receiving the filtered signal output, and for providing an adjusted filtered signal at a second node, where the second node is coupled to the signal selector, and where an operation of the signal selector is enhanced by the filter and the noise canceller arrangement.

Claims

1. A signal selector enhancer, comprising:

a filter configured to receive a signal from a first node, and to provide a filtered signal output therefrom, wherein the first node is coupled to a signal selector; and

a noise canceller configured to receive the filtered signal output, and to provide an adjusted filtered signal at a second node, wherein the second node is coupled to the signal selector such that an operation of the signal selector is enhanced by the filter and the noise canceller arrangement.

2. The signal selector enhancer of claim 1, wherein the noise canceller is configured to cancel detected interference, noise, unwanted harmonics, and spurs.

3. The signal selector enhancer of claim 1, wherein the filter is configured to at least partially match the signal selector.

4. The signal selector enhancer of claim 1, wherein the signal selector comprises a duplexer.

5. The signal selector enhancer of claim 1, wherein the signal selector comprises a switch.

6. The signal selector enhancer of claim 1, wherein:

the signal selector is coupled to an antenna;

the first node is coupled to a transmit path; and

the second node is coupled to a receive path.

7. The signal selector enhancer of claim 6, further comprising:

a second filter coupled to a second noise canceller, wherein the second filter and the second noise canceller are configured between the transmit path and the antenna; and

a third filter coupled to a third noise canceller, wherein the third filter and the third noise canceller are configured between the antenna and the receive path.

8. The signal selector enhancer of claim 1, further comprising a variable gain attenuator coupled between the filter and the noise canceller.

9. The signal selector enhancer of claim 8, further comprising a coupler configured to provide an input from the first node to the filter.

10. The signal selector enhancer of claim 1, wherein the noise canceller comprises a quadrature splitter configured to provide a first split output to a first amplifier and a second split output to second amplifier, wherein outputs of the first and second amplifiers are summed to form an output of the noise canceller.

11. A method of enhancing a signal selector operation, the method comprising:

filtering a signal received from a first node to provide a filtered signal therefrom, wherein the first node is coupled to a signal selector;

adjusting the filtered signal to provide an adjusted filtered signal at a second node, wherein the second node is coupled to the signal selector; and

combining the adjusted filtered signal with an output of the signal selector such that an operation of the signal selector is enhanced.

12. The method of claim 11, wherein the adjusting the filtered signal comprises cancelling detected interference, noise, harmonics of the signal and spurs.

13. The method of claim 11, wherein the filtering the signal comprises at least partially matching the signal selector.

14. The method of claim 11, wherein the adjusting the filtered signal comprises adjusting at least one of gain, phase, and delay.

15. The method of claim 11, wherein the signal selector comprises a duplexer.

16. The method of claim 11, wherein the signal selector comprises a switch.

17. A signal module, comprising:

an antenna configured to receive and transmit electromagnetic signals at a signal selector;

a transmitter coupled to a transceiver, the transmitter being configured to provide a transmit signal at a first node;

a receiver coupled to a transceiver, the receiver being configured to receive a receiver signal at a second node; and

a signal selector enhancer, comprising;

a filter configured to receive a signal from the first node, and to provide a filtered signal output therefrom, wherein the first node is coupled to the signal selector; and

a noise canceller configured to receive the filtered signal output, and to provide an adjusted filtered signal at the second node, wherein the second node is coupled to the signal selector, and wherein an operation of the signal selector is enhanced by the filter and the noise canceller arrangement.

18. The signal module of claim 17, wherein the noise canceller is configured to cancel detected interference, noise, harmonics of the signal, and spurs.

19. The signal module of claim 17, wherein the filter is configured to at least partially match the signal selector.

20. The signal module of claim 17, wherein the signal selector comprises a duplexer.