Method and system for polar modulation with discontinuous phase for RF transmitters with integrated amplitude shaping

• US 8,085,089 B2
• Filed: 10/19/2007
• Issued: 12/27/2011
• Est. Priority Date: 07/31/2007
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Rofougaran, Ahmadreza
• Primary Examiner(s): Choe, Henry
• Application Number:
  US11/875,063
• Publication Number:
  US 20110291756A1
• Time in Patent Office: 1,530 Days
• Field of Search: 330/129, 330/278, 330/136, 330/310, 330/150, 330/98
• US Class Current: 330/129
• CPC Class Codes: H03C 5/00 Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal H03C7/00 takes precedence
• CPC Class Codes: H03F 2200/336 A I/Q, i.e. phase quadrature, modulator or demodulator being used in an amplifying circuit
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H04L 27/361 Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation
• CPC Class Codes: H04L 27/362 Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated H04L27/366 takes precedence
• CPC Class Codes: H04L 27/368 adaptive predistortion

Abstract

Aspects of a method and system for polar modulation with discontinuous phase for RF transmitters with integrated amplitude shaping may include amplifying a signal via a plurality of amplifiers such that a combined gain of the plurality of amplifiers comprises a coarse amplitude gain, an amplitude offset gain and a pulse-shaping gain. A gain of one or more of the plurality of amplifiers may be adjusted to set the coarse amplitude gain. A gain of one or more of the plurality of amplifiers may be adjusted to set the amplitude offset gain and the pulse-shaping gain, wherein the one or more of the plurality of amplifiers used to set said amplitude offset gain and said pulse-shaping gain are distinct from the one or more of said plurality of amplifiers used to set the coarse amplitude gain.

Claims

1. A method for processing communication signals, the method comprising:

amplifying a signal via a plurality of amplifiers such that a combined gain of said plurality of amplifiers comprises a coarse amplitude gain, an amplitude offset gain and a pulse-shaping gain;

adjusting a gain of one or more of said plurality of amplifiers to set said coarse amplitude gain; and

adjusting a gain of one or more of said plurality of amplifiers to set said amplitude offset gain and said pulse-shaping gain, wherein said one or more of said plurality of amplifiers used to set said amplitude offset gain and said pulse-shaping gain are distinct from said one or more of said plurality of amplifiers used to set said coarse amplitude gain.

2. The method according to claim 1, comprising dynamically adjusting said setting of said coarse amplitude gain, said pulse-shaping gain and/or said amplitude offset gain.

3. The method according to claim 1, comprising adaptively adjusting said setting of said coarse amplitude gain, said pulse-shaping gain and/or said amplitude offset gain.

4. The method according to claim 1, comprising switching said gain of said one or more of said plurality of amplifiers associated with said coarse amplitude gain between unity gain and an arbitrary fixed gain.

5. The method according to claim 1, wherein said gain of said one or more of said plurality of amplifiers associated with said amplitude offset gain and said pulse-shaping gain is variable and arbitrary.

6. The method according to claim 1, wherein said gain of said one or more of said plurality of amplifiers associated with said amplitude offset gain and said pulse-shaping gain is variable and discrete.

7. The method according to claim 1, wherein said one or more of said plurality of amplifiers associated with said amplitude offset gain and said pulse-shaping gain comprises one or more analog amplifier.

8. The method according to claim 1, comprising generating said signal by phase-modulating a radio-frequency carrier.

9. The method according to claim 1, comprising controlling said combined gain of said plurality of amplifiers based on a desired amplitude modulation and a desired pulse-shape.

10. The method according to claim 1, comprising adjusting said pulse-shaping gain as a function of time to generate a continuous-time pulse-shape.

11. A system for processing communication signals, the system comprising:

one or more circuits comprising a plurality of amplifiers that enable;

amplification of a signal via said plurality of amplifiers such that a combined gain of said plurality of amplifiers comprises a coarse amplitude gain, an amplitude offset gain and a pulse-shaping gain;

adjustment of a gain of one or more of said plurality of amplifiers to set said coarse amplitude gain; and

adjustment of a gain of one or more of said plurality of amplifiers to set said amplitude offset gain and said pulse-shaping gain, wherein said one or more of said plurality of amplifiers used to set said amplitude offset gain and said pulse-shaping gain are distinct from said one or more of said plurality of amplifiers used to set said coarse amplitude gain.

12. The system according to claim 11, wherein said one or more circuits dynamically adjust said setting of said coarse amplitude gain, said pulse-shaping gain and/or said amplitude offset gain.

13. The system according to claim 11, wherein said one or more circuits adaptively adjust said setting of said coarse amplitude gain, said pulse-shaping gain and/or said amplitude offset gain.

14. The system according to claim 11, wherein said one or more circuits switch said gain of said one or more of said plurality of amplifiers associated with said coarse amplitude gain between unity gain and an arbitrary fixed gain.

15. The system according to claim 11, wherein said gain of said one or more of said plurality of amplifiers associated with said amplitude offset gain and said pulse-shaping gain is variable and arbitrary.

16. The system according to claim 11, wherein said gain of said one or more of said plurality of amplifiers associated with said amplitude offset gain and said pulse-shaping gain is variable and discrete.

17. The system according to claim 11, wherein said one or more of said plurality of amplifiers associated with said amplitude offset gain and said pulse-shaping gain comprises on or more an analog amplifier.

18. The system according to claim 11, wherein said one or more circuits generate said signal by phase-modulating a radio-frequency carrier.

19. The system according to claim 11, wherein said one or more circuits control said combined gain of said plurality of amplifiers based on a desired amplitude modulation and a desired pulse-shape.

20. The system according to claim 11, wherein said one or more circuits adjust said pulse-shaping gain as a function of time to generate a continuous-time pulse-shape.