METHOD AND SYSTEM FOR SCALING SUPPLY, DEVICE SIZE, AND LOAD OF A POWER AMPLIFIER

• US 20090153250A1
• Filed: 12/12/2007
• Published: 06/18/2009
• Est. Priority Date: 12/12/2007
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Rofougaran, Ahmadreza
• Application Number:
  US11/954,907
• Publication Number:
  US 20090153250A1
• Time in Patent Office: Days
• US Class Current: 330/297
• CPC Class Codes: H03F 1/02 Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
• CPC Class Codes: H03F 1/0222 by using a signal derived from the input signal
• CPC Class Codes: H03F 1/0277 Selecting one or more amplifiers from a plurality of amplifiers
• CPC Class Codes: H03F 2203/45396 the AAC comprising one or more switches
• CPC Class Codes: H03F 2203/45466 the CSC being controlled, e.g. by a signal derived from a non specified place in the dif amp circuit
• CPC Class Codes: H03F 2203/45731 the LC comprising a transformer
• CPC Class Codes: H03F 2203/7236 the gated amplifier being switched on or off by putting into parallel or not, by choosing between amplifiers by (a ) switch(es)
• CPC Class Codes: H03F 3/211 using a combination of several amplifiers H03F3/60 takes precedence
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H03F 3/245 with semiconductor devices only
• CPC Class Codes: H03F 3/45183 Long tailed pairs H03F3/4521, H03F3/45237 take precedence
• CPC Class Codes: H03F 3/72 Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
• CPC Class Codes: H04B 1/0483 Transmitters with multiple parallel paths
• CPC Class Codes: H04B 2001/045 with means for improving efficiency

Abstract

Aspects of a method and system for scaling supply, device size, and load of a power amplifier (PA) are provided. In this regard parameters of a PA, and a voltage, a current, and/or a load of the PA may be configured based on a determined amplitude of a baseband signal and based on a transmit power of the PA. In this regard, the PA may be configured by configuring device size of and/or selecting one or more transistors within the PA. The load may be a transformer and may be configured by adjusting a windings ratio. The PA may comprise one or more differential pairs. In this regard, device size of the differential pair(s) may be configured based on the determined amplitude of the baseband signal and based on a transmit power of the PA.

Claims

1. A method for signal processing, the method comprising:

determining an amplitude of a baseband signal; and

configuring parameters of a power amplifier, and adjusting one or more of a voltage, a current, and a load of said power amplifier based on said determined amplitude of said baseband signal and based on a transmit power of said power amplifier.

2. The method according to claim 1, comprising configuring device sizing of transistors within said power amplifier.

3. The method according to claim 1, comprising controlling a windings ratio of one or more transformers to enable said adjustment of said load.

4. The method according to claim 3, wherein said windings ratio is determined based on an output impedance of said configured power amplifier and an impedance of an antenna communicatively coupled to said power amplifier.

5. The method according to claim 1, comprising configuring said power amplifier by selecting one or more of a plurality of transistors of said power amplifier utilizing one or more switching elements.

6. A method for signal processing, the method comprising:

in a power amplifier comprising one or more differential pairs, determining based on an amplitude of a baseband signal to be amplified by said power amplifier and based on a transmit power of said power amplifier;

device sizing of said one or more differential pairs; and

a voltage, current and/or load coupled to said one or more differential pairs.

7. The method according to claim 6, wherein said one or more differential pairs is communicatively coupled to one or more transformers with a windings ratio that is determined based on said device sizing.

8. The method according to claim 6, wherein each of said one or more differential pairs comprises different device sizes

9. The method according to claim 8, comprising selecting each of said one or more differential pairs via one or more switching elements.

10. The method according to claim 9, comprising controlling said switching elements based on said determined amplitude and said transmit power of said power amplifier.

11. A system for signal processing, the system comprising:

one or more circuits in a transmitter that determine an amplitude of a baseband signal, wherein said one or more circuits comprises a power amplifier; and

said one or more circuits configure parameters of said power amplifier, and adjust one or more of a voltage, a current, and a load of said power amplifier based on said determined amplitude of said baseband signal and based on a transmit power of said power amplifier.

12. The system according to claim 11, wherein said one or more circuits comprise one or more transistors, and configure device sizing of said one or more transistors within said power amplifier.

13. The system according to claim 11, wherein said one or more circuits comprise one or more transformers, and control a windings ratio of said one or more transformers to enable said adjustment of said load.

14. The system according to claim 13, wherein said windings ratio is determined based on an output impedance of said configured power amplifier and an impedance of an antenna communicatively coupled to said power amplifier.

15. The system according to claim 11, wherein said one or more circuits comprise a plurality of transistors, and configure said power amplifier by selecting one or more of said plurality of transistors of said power amplifier utilizing one or more switching elements.

16. A system for signal processing, the system comprising:

in a power amplifier comprising one or more differential pairs, one or more circuits that determine, based on an amplitude of a baseband signal to be amplified by said power amplifier and based on a transmit power of said power amplifier, at least;

device sizing of said one or more differential pairs; and

a voltage, current and/or load coupled to said one or more differential pairs.

17. The system according to claim 16, wherein said one or more differential pairs is communicatively coupled to one or more transformers with a windings ratio that is determined based on said device sizing.

18. The system according to claim 16, wherein each of said one or more differential pairs comprises different device sizes

19. The system according to claim 18, wherein said one or more circuits select each of said one or more differential pairs via one or more switching elements.

20. The system according to claim 19, wherein said one or more circuits control said switching elements based on said determined amplitude and said transmit power of said power amplifier.