Integrated radio frequency filters for multiband transceivers

Patent metadata

Field	Value
Publication number	US-9819368-B2
Application number	US-61340209-A
Country	US
Kind code	B2
Filing date	Nov 5, 2009
Priority date	Sep 3, 2004
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A system and method integrates signal filters in a multiband transceiver. A preferred embodiment comprises an amplifier with a first tunable capacitor coupled to a signal input and a tunable filter. The tunable filter comprises an input stage with a first pair of inductors arranged in a dipole configuration and a second tunable capacitor coupled in parallel to the first pair of inductors and an output stage inductively coupled to the input stage, the output stage includes a second pair of inductors also arranged in a dipole configuration and a third tunable capacitor coupled in parallel to the second pair of inductors. The inductors are realized using bond wire or any other high Q material. The first tunable capacitor, the second tunable capacitor, and the third tunable capacitor can be tuned using a master-slave tuning configuration to adjust the operating frequency of the amplifier and the tunable filter to enable frequency band compatibility with multiple communications protocols.

First claim

What is claimed is:

1. A multiband transceiver, comprising:
a first matching network associated with a first group of communication protocols;
a first low noise amplifier coupling said first matching network to a first high performance filter;
a first mixer coupled to said high performance filter;
a second matching network associated with another communications protocol; and
a second low noise amplifier coupling said second matching network to said high performance filter.

2. The multiband transceiver of claim 1 , further comprising:
a third matching network associated with a second group of communication protocols; and
a third low noise amplifier coupling said second matching network to a second high performance filter.

3. The multiband transceiver of claim 2 , further comprising:
a fourth matching network associated with yet another communications protocol;
a fourth low noise amplifier coupling said fourth matching network to said second high performance filter.

4. The multiband transceiver of claim 3 , wherein said yet another communications protocol is CDMA LB.

5. The multiband transceiver of claim 2 , wherein said second group of communication protocols comprise EGSM and WCDMA LB.

6. The multiband transceiver of claim 1 , further comprising:
a third matching network associated with yet another communications protocol;
a third low noise amplifier coupling said third matching network to a second high performance filter.

7. The multiband transceiver of claim 1 , wherein said communication protocols of said first group use adjacent frequency bands.

8. The multiband transceiver of claim 1 , wherein said communication protocols of said first group use overlapping frequency bands.

9. The multiband transceiver of claim 1 , wherein some of said communication protocols of said first group use adjacent frequency bands others use overlapping frequency bands.

10. The multiband transceiver of claim 1 , wherein said first group of communication protocols comprise GPS, GSM DCS, GSM PCS, and WCDMA HB.

11. The multiband transceiver of claim 1 , wherein said another communications protocol is CDMA HB.

12. The multiband transceiver of claim 1 , wherein said first and second low noise amplifier comprises tunable capacitors.

13. The multiband transceiver of claim 12 , wherein said high performance filter comprises adjustable inductors.

14. The multiband transceiver of claim 1 , wherein said high performance filter comprises adjustable inductors.

15. A multiband transceiver, comprising:
a first matching network associated with a first communications protocol;
a first low noise amplifier coupling said first matching network to a high performance filter;
a first mixer coupled to said high performance filter;
a second matching network associated with a second communications protocol;
a second low noise amplifier coupling said second matching network to a second mixer;
a third matching network associated with a third communications protocol;
a third low noise amplifier coupling said third matching network to a third mixer; and
wherein first, second and third communications protocols comprise the group of: GPS, GSM DCS and GSM PCS.

16. A method of operating a multiband transceiver, comprising the steps of:
associating a first matching network with a first group of communication protocols;
coupling a first low noise amplifier to said first matching network;
coupling a first high performance filter to said first low noise amplifier;
coupling a first mixer to said high performance filter;
associating a second matching network with another communications protocol;
coupling a second low noise amplifier to said second matching network; and
coupling said second matching network to said first mixer.

17. The method of claim 16 , further comprising:
associating a third matching network with a second group of communication protocols; and
coupling a third low noise amplifier to said third matching network and to a second high performance filter; and
coupling said second high performance filter to a second mixer.

18. The method of claim 17 , further comprising:
associating a fourth matching network with yet another communications protocol; and
coupling a fourth low noise amplifier to said fourth matching network and to said second high performance filter; and
coupling said second high performance filter to a second mixer.

19. The method of claim 16 , further comprising:
associating a third matching network with yet another communications protocol; and
coupling a third low noise amplifier to said third matching network and to a second high performance filter; and
coupling said second high performance filter to a second mixer.

Assignees

• Yanduru Naveen Krishna
• Howard Gregory Eric
• Griffith Danielle
• Venkatraman Srinivasan
• Texas Instruments Inc

Inventors

• Yanduru Naveen Krishna
• Howard Gregory Eric
• Griffith Danielle
• Venkatraman Srinivasan

Classifications

• H03H2250/00

  Indexing scheme relating to dual- or multi-band filters · CPC title

• H04B1/006

  using switches for selecting the desired band (H04B1/0057 takes precedence) · CPC title

• H03H7/38

  Impedance-matching networks · CPC title

• H04B1/005

  adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges · CPC title

• H03H2007/386

  Multiple band impedance matching · CPC title