Modulated radio frequency signal generation method and modulated signal source

• US 6,587,010 B2
• Filed: 11/27/2001
• Issued: 07/01/2003
• Est. Priority Date: 11/27/2001
• Status: Active Grant

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Midya, Pallab, Wagh, Poojan A., Rakers, Patrick
• Primary Examiner(s): Pascal, Robert
• Assistant Examiner(s): Chang, Joseph
• Application Number:
  US09/995,123
• Publication Number:
  US 20030098753A1
• Time in Patent Office: 581 Days
• Field of Search: 332/105, 332/109, 332/108, 332/107
• US Class Current: 332/105
• CPC Class Codes: H03K 7/00 Modulating pulses with a continuously-variable modulating signal
• CPC Class Codes: H04B 1/04 Circuits

Abstract

A modulated signal source for implementing A modulated signal method of a generating a modulated signal having a radio frequency based upon a linear mixing of signals is disclosed. An in-phase pulse signal modulator of the modulated signal source provides an in-phase pulse modulated signal in response to a reception of a baseband in-phase signal and an in-phase clock signal with the in-phase clock signal and the in-phase pulse modulated signal being synchronized. A quadrature pulse signal modulator of the modulated signal source provides a quadrature pulse modulated signal in response to a reception of a baseband quadrature signal and a quadrature clock signal with the quadrature clock signal and the quadrature pulse modulated signal being synchronized. A switch signal generator of the modulated signal source generates an in-phase switch signal and a quadrature switch signal in response to a reception of the in-phase clock signal, the in-phase pulse modulated signal, the quadrature clock signal, and the quadrature pulse modulated signal. The in-phase clock signal and the in-phase switch signal are synchronized, and the quadrature clock signal and the quadrature switch signal are synchronized. A radio frequency signal generator of the modulated signal source provides one or more modulated signals having a radio frequency in response to either a reception the in-phase switch signal and the quadrature phase signal, or a reception of a switch signal as a function of the in-phase switch signal and the quadrature phase signal.

Claims

1. A communication method, comprising:

receiving a first baseband signal in digital form;

receiving a first clock signal;

providing a first pulse modulated signal in digital form in response to a reception of the first baseband signal and a reception of the first clock signal,

wherein the first clock signal and the first pulse modulated signal are synchronized

receiving a second baseband signal in digital form;

receiving, a second clock signal; and

providing a second pulse modulated signal in digital form in response to a reception of the second baseband signal and a reception of the second clock signal,

wherein the second clock signal and the second pulse modulated signal are synchronized.

2. The modulated signal method of claim 1, further comprising:

providing a switch signal in digital form in response to a reception of the first clock signal and a reception of the first pulse modulated signal.

3. The modulated signal method of claim 2, wherein the first clock signal, the first pulse modulated signal, and the switch signal are synchronized.

4. The modulated signal method of claim 2, further comprising:

providing a modulated signal having a radio frequency in response to a filtering and an amplification of the switch signal.

5. The modulated signal method of claim 1, further comprising:

providing a first switch signal in digital form in response to a reception of the first clock signal and a reception of the first pulse modulated signal; and

providing a second switch signal in digital form in response to a reception of the second clock signal and a reception of the second pulse modulated signal.

6. The modulated signal method of claim 5,

wherein the first clock signal, the first pulse modulated signal, and the first switch signal are synchronized;

and

wherein the second clock signal, the second pulse modulated signal, and the second switch signal are synchronized.

7. The modulated signal method of claim 5, further comprising:

providing a third switch signal in digital form as a function of the first switch signal and the second switch signal.

8. The modulated signal method of claim 7, further comprising:

providing a modulated signal having a radio frequency in response to a filtering and an amplification of the third switch signal.

10. The modulated signal source of claim 1, wherein the first clock signal, the first pulse modulated signal, and the first switch signal are synchronized.

11. The modulated signal source of claim 1, further comprising:

a radio frequency signal generator operable to provide a modulated signal having a radio frequency in response to a reception of the first switch signal.

12. The modulated signal source of claim 1, further comprising:

a switch signal generator operable to provide a first switch signal in digital form in response to a reception of the first clock signal and the first pulse modulated signal, and

to provide a second switch in signal in digital form in response to a reception of a second clock signal and a second pulse modulated signal.

13. The modulated signal source of claim 1, further comprising:

a switch signal generator operable to provide a switch signal in digital form in response to a reception of the first clock signal, the first pulse modulated signal, the second clock signal and the second pulse modulated signal.

14. The modulated signal source of claim 13, further comprising:

a radio frequency signal generator operable to provide a modulated signal having a radio frequency in response to a reception of the switch signal.

15. The modulated signal source of claim 12,

wherein the first clock signal, the first pulse modulated signal, and the first switch signal are synchronized;

and

wherein the second clock signal, the second pulse modulated signal, and the second switch signal are synchronized.

16. The modulated signal source of claim 15, further comprising:

a radio frequency signal generator operable to provide a first modulated signal having a radio frequency in response to a reception of the first switch signal, and to provide a second modulated signal having a radio frequency in response to a reception of the second switch signal.

9. A modulated signal source, comprising:

an oscillator operable to provide a first clock signal;

a first pulse signal modulator operable to provide a first pulse modulated signal in digital form in response to a reception of a first baseband signal and the first clock signal,

wherein the first clock signal and the first pulse modulated signal are synchronized;

a switch signal generator operable to provide a first switch signal in digital form in response to a reception of the first clock signal and the first pulse modulated signal,

wherein the first switch signal and the first clock signal are synchronized; and

a second signal generator operable to provide a second pulse modulated signal in digital form in response to a reception of a second baseband signal and a reception of a second clock signal;

wherein said oscillator is further operable to provide the second clock signal, and

wherein the second clock signal and the second pulse modulated signal are synchronized.

17. A modulated signal method, comprising:

generating a first pulse modulated signal in response to a reception of a first clock signal and a first baseband signal, the first clock signal and the first pulse modulated signal being synchronized; and

generating a second pulse modulated signal in response to a reception of a second clock signal and a second baseband signal, the second clock signal and the second pulse modulated signal being synchronized.

18. A modulated signal source, comprising:

means for generating a first pulse modulated signal in response to a reception of a first clock signal and a first baseband signal, the first clock signal and the first pulse modulated signal being synchronized; and

means for generating a second pulse modulated signal in response to a reception of a second clock signal and a second baseband signal, the second clock signal and the second pulse modulated signal being synchronized.

19. A modulated signal source, comprising:

an oscillator operable to provide a first clock signal;

a first pulse signal modulator operable to provide a first pulse modulated signal in digital form in response to a reception of a first baseband signal and the first clock signal,

wherein the first clock signal and the first pulse modulated signal are synchronized

a switch signal generator operable to provide a first switch signal in digital form in response to a reception of the first clock signal and the first pulse modulated signal, and to provide a second switch signal in digital form in response to a reception of a second clock signal and a second pulse modulated signal.