Shared functional block multi-mode multi-band communication transceivers

• US 7,092,676 B2
• Filed: 05/23/2003
• Issued: 08/15/2006
• Est. Priority Date: 04/23/1999
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Skyworks Solutions Incorporated
• Inventors: Laub, Dana Vincent, Abdelgany, MohyEldeen Fouad
• Primary Examiner(s): VO, NGUYEN THANH
• Application Number:
  US10/444,803
• Publication Number:
  US 20030193923A1
• Time in Patent Office: 1,180 Days
• Field of Search: 455/550.1, 455/552.1, 455/553.1, 455/76, 455/324, 455/323, 455/314, 455/339, 455/303, 455/307, 375/302, 375/322, 375/324
• US Class Current: 455/76
• CPC Class Codes: H04B 1/005 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
• CPC Class Codes: H04B 1/006 using switches for selecting the desired band H04B1/0057 takes precedence
• CPC Class Codes: H04B 1/28 the receiver comprising at least one semiconductor device having three or more electrodes
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04B 1/707 using direct sequence modulation

Abstract

A multiple-mode multiple band transceiver is disclosed. Some embodiments include a multiple-channel transmitter including a plurality of selectable transmit-channel components, the plurality of selectable transmit-channel components sharing at least one element coupled to a modulator, the plurality of selectable transmit channel components forming at least first and second transmit channels configured to generate radio-frequency signals using at least a first and a second multiple-access modulation technique, and a first switch configured to enable at least one of the first and second transmit channels to transmit a communication signal using at least one of the first and the second multiple-access modulation techniques.

Claims

1. A multi-mode, multiple-band transceiver, comprising:

a controllable oscillator;

a multiple channel transmitter comprising;

a first selectable transmit path comprising a first variable gain amplifier, the first selectable transmit path configured to use a direct launch signal transmission technique to generate radio-frequency signals using a first multiple-access communication protocol;

a second selectable transmit path comprising a second variable gain amplifier, the second selectable transmit path configured to use a direct launch signal transmission technique to generate radio-frequency signals using a second multiple-access communication protocol;

a power amplifier coupled to the first and second variable gain amplifiers; and

a modulator comprising;

a first low pass filter corresponding to an in-phase component of either the first or second multiple-access communication protocol;

a second low pass filter corresponding to a quadrature component of either the first or second multiple-access communication protocol; and

modulation electronics connected to the first and second variable gain amplifiers, the first and second low pass filters, and the controllable oscillator.

2. The transceiver of claim 1, wherein the modulation electronics comprises a first mixer and a second mixer, the first and second mixers coupled to a divider, the first and second mixers coupled to a summer, the summer directly connected to the first and second variable gain amplifiers.

3. The transceiver of claim 1, wherein the controllable oscillator comprises a voltage controllable oscillator.

4. The transceiver of claim 1, wherein the first multiple-access communication protocol comprises wideband code division multiple access (WCDMA).

5. The transceiver of claim 4, further comprising a band pass filter coupled between the power amplifier and the first variable gain amplifier.

6. The transceiver of claim 1, wherein the second multiple-access communication protocol comprises one of global system for mobile (GSM) communication and enhanced data for GSM evolution.

7. The transceiver of claim 1, further comprising a third selectable transmit path having a third variable gain amplifier, the third selectable transmit path configured to generate radio-frequency signals using a third multiple-access communication protocol, wherein the third selectable transmit path uses a direct launch signal transmission technique.

8. The transceiver of claim 7, wherein the third multiple-access communication protocol comprises at least one of Personal Communications System (PCS) and Data Communications System (DCS).

9. The transceiver of claim 1, further comprising a fourth variable gain amplifier coupled between the first low pass filter and the modulation electronics.

10. The transceiver of claim 9, further comprising a fifth Variable gain amplifier coupled between the second low pass filter and the modulation electronics.

11. The transceiver of claim 1, further comprising mode selector electronics coupled to the transceiver to provide mode select functionality.

12. The transceiver of claim 1, wherein the modulator, the controllable oscillator, and the transmitter are fabricated on a single integrated circuit.

13. The transceiver of claim 1, further comprising a first switch configured to enable at least one of the first and second transmit paths to transmit a communication signal using at least one of the first and the second multiple-access communication protocols.

14. The transceiver of claim 1, further comprising a multiple channel receiver configured to receive radio-frequency signals using at least the first and second multiple-access communication protocols, said multiple channel receiver including a plurality of selectable receive channel components, the plurality of selectable receive channel components coupled to a demodulator configured to produce an in-phase data signal channel and a quadrature data signal channel;

and

a second switch configured to enable at least one of the receive channel components to receive a communication signal using one of the first and second multiple access communication protocols.

15. The transceiver of claim 14, wherein each of the in-phase data signal channel and the quadrature data signal channel comprise a receive-side variable gain amplifier.

16. The transceiver of claim 14, wherein each of the in-phase data signal channel and the quadrature data signal channel comprise a second-order bandpass filter.

17. The transceiver of claim 14, wherein each of the in-phase data signal channel and the quadrature data signal channel comprise at least one additional bandpass filter.

18. The transceiver of claim 17, wherein the at least one additional bandpass filter has a filter order greater than two.

19. The transceiver of claim 14, wherein each of the in-phase data signal channel and the quadrature data signal channel comprise a direct-coupled offset corrector.

20. The transceiver of claim 19, wherein the direct-coupled offset corrector comprises a sample and hold circuit.

21. The transceiver of claim 19, wherein the direct-coupled offset corrector comprises a continuous servo loop.

22. A multi-mode, multiple-band transceiver, comprising:

a controllable oscillator;

a multiple channel transmitter comprising;

a first selectable transmit path comprising cascaded first and second variable gain amplifiers, the first selectable transmit path configured to use a direct launch signal transmission technique to generate radio-frequency signals using a first multiple-access communication protocol; and

a second selectable transmit path comprising a third variable gain amplifier, the second selectable transmit path configured to use a direct launch signal transmission technique to generate radio-frequency signals using a second multiple-access communication protocol;

a power amplifier coupled to the first, second, and third variable gain amplifiers; and

a modulator comprising;

a first low pass filter corresponding to an in-phase component of the first multiple-access communication protocol;

a second low pass filter corresponding to an in-phase component of the second multiple-access communication protocol;

a third low pass filter corresponding to a quadrature component of the first multiple-access communication protocol;

a fourth low pass filter corresponding to a quadrature component of the second multiple-access communication protocol; and

modulation electronics connected to the first and third variable gain amplifiers, the first, second, third, and fourth low pass filters, and the controllable oscillator.

23. The transceiver of claim 22, wherein the modulation electronics comprises a first mixer and a second mixer, the first and second mixers coupled to a first divider, the first and second mixers coupled to the second and fourth low pass filters, respectively, the first and second mixers coupled to a first summer, the first summer directly connected to the third variable gain amplifier.

24. The transceiver of claim 23, wherein the modulation electronics further comprises a third mixer and a fourth mixer, the third and fourth mixers coupled to the first and third low pass filters, respectively, the third and fourth mixers coupled to a second divider, the second divider coupled to the first divider and to the controllable oscillator, the fourth mixer coupled to a second summer, the second summer directly connected to the first variable gain amplifier.

25. The transceiver of claim 22, wherein the controllable oscillator comprises a voltage controllable oscillator.

26. The transceiver of claim 22, wherein the first multiple-access communication protocol comprises wideband code division multiple access (WCDMA).

27. The transceiver of claim 22, further comprising a band pass filter coupled between the power amplifier and the second variable gain amplifier.

28. The transceiver of claim 22, wherein the second multiple-access communication protocol comprises one of global system for mobile (GSM) communication and enhanced data for GSM evolution.

29. The transceiver of claim 22, further comprising a third selectable transmit path having a fourth variable gain amplifier, the third selectable transmit path configured to generate radio-frequency signals using a third multiple-access communication protocol, wherein the third selectable transmit path uses a direct launch signal transmission technique.

30. The transceiver of claim 29, wherein the third multiple-access communication protocol comprises at least one of Personal Communications System (PCS) and Data Communications System (DCS).

31. The transceiver of claim 22, further comprising mode selector electronics coupled to the transceiver to provide mode select functionality.

32. The transceiver of claim 22, wherein the modulator, the controllable oscillator, and the transmitter are fabricated on a single integrated circuit.

33. The transceiver of claim 22, further comprising a first switch configured to enable at least one of the first and second transmit paths to transmit a communication signal using at least one of the first and the second multiple-access communication protocols.

34. The transceiver of claim 22, further comprising a multiple channel receiver configured to receive radio-frequency signals using at least the first and second multiple-access communication protocols, said multiple channel receiver including a plurality of selectable receive channel components, the plurality of selectable receive channel components coupled to a demodulator configured to produce an in-phase data signal channel and a quadrature data signal channel;

and

a second switch configured to enable at least one of the receive channels to receive a communication signal using one of the first and second multiple access communication protocols.

35. The transceiver of claim 34, wherein each of the in-phase data signal channel and the quadrature data signal channel comprise a receive-side variable gain amplifier.

36. The transceiver of claim 34, wherein each of the in-phase data signal channel and the quadrature data signal channel comprise a second-order bandpass filter.

37. The transceiver of claim 34, wherein each of the in-phase data signal channel and the quadrature data signal channel comprise at least one additional bandpass filter.

38. The transceiver of claim 37, wherein the at least one additional bandpass filter has a filter order greater than two.

39. The transceiver of claim 34, wherein each of the in-phase data signal channel and the quadrature data signal channel comprise a direct-coupled offset corrector.

40. The transceiver of claim 39, wherein the direct-coupled offset corrector comprises a sample and hold circuit.

41. The transceiver of claim 39, wherein the direct-coupled offset corrector comprises a continuous servo loop.