Bypassable amplifier

• US 6,137,354 A
• Filed: 05/18/1998
• Issued: 10/24/2000
• Est. Priority Date: 05/18/1998
• Status: Expired due to Term

• Current Assignee: Micron Technology, Inc.
• Original Assignee: Omnipoint Corp. (Deutsche Telekom AG)
• Inventors: Morris, Russell A., Dacus, Farron L.
• Primary Examiner(s): Mottola, Steven J.
• Application Number:
  US09/080,812
• Time in Patent Office: 890 Days
• Field of Search: 330/51, 330/127, 330/129, 330/151, 330/279, 330/285, 330/296, 330/297, 330/310, 330/311
• US Class Current: 330/51
• CPC Class Codes: H03F 1/0255 by using a signal derived from the output signal
• CPC Class Codes: H03F 1/0272 by using a signal derived from the output signal
• CPC Class Codes: H03G 3/004 Control by varying the supply voltage
• CPC Class Codes: H03G 3/3042 in modulators, frequency-changers, transmitters or power amplifiers transmission power control in bidirectional transmission systems H04W52/04

Abstract

An adaptable DC power consumption circuit is provided, wherein a controller alternately operates an RF amplifier during a high RF output power condition, and bypasses the RF amplifier during a low RF output power condition. In this manner, linear operation of the RF amplifier can be maintained while maximizing the power efficiency of the RF amplifier.

Claims

1. A method for dynamically improving the efficiency of an RF amplifier, the method comprising:

amplifying an RF signal through a driver;

providing the flow of power to said RF amplifier and amplifying said RF signal through said RF amplifier in response to a high RF output power condition;

impeding the flow of power to said RF amplifier and bypassing further amplification of said RF signal through said RF amplifier in response to a low RF output power condition;

wherein said power provided to said RF amplifier produces a supply current in said RF amplifier during a high RF output power condition, the method further comprising the steps;

producing a signal;

producing a supply current tracking signal indicating the present level of said supply current;

determining the difference between at least said signal and at least said supply current tracking signal to obtain a gate biasing signal; and

varying said supply current in proportion to said gate biasing signal.

2. The method of claim 1, wherein said signal is a control tracking signal indicating the desired level of said supply current.

3. The method of claim 1, wherein said RF signal is a modulated RF signal having a modulated RF envelope, and said signal is a control and envelope tracking signal indicating the desired level of said supply current and the present level of said modulated RF envelope signal.

7. The method of claim 1, wherein said power provided to said RF amplifier produces a supply voltage across said RF amplifier during a high RF output power condition, the method further comprising the steps:

producing another signal;

producing a supply voltage tracking signal indicating the present level of said supply voltage;

determining the difference between at least said another signal and at least said supply voltage tracking signal to obtain a biasing signal; and

varying said supply voltage in proportion to said biasing signal.

8. The method of claim 7, wherein said signal is a control tracking signal indicating the desired level of said supply current, and said another signal is a control tracking signal indicating the desired level of said supply voltage.

9. The method of claim 7, wherein said RF signal is a modulated RF signal having a modulated RF envelope, and said signal is a control and envelope tracking signal indicating the desired level of said supply current and the present level of said modulated RF envelope signal, and said another signal is another control and envelope tracking signal indicating the desired level of said supply voltage and the present level of said modulated RF envelope signal.

4. A method for dynamically improving the efficiency of an RF amplifier, the method comprising:

amplifying an RF signal through a driver;

providing the flow of power to said RF amplifier and amplifying said RF signal through said RF amplifier in response to a high RF output power condition;

impeding the flow of power to said RF amplifier and bypassing further amplification of said RF signal through said RF amplifier in response to a low RF output power condition;

wherein said power provided to said RF amplifier produces a supply voltage across said RF amplifier during a high RF output power condition, the method further comprising the steps;

producing a signal;

producing a supply voltage tracking signal indicating the present level of said supply voltage;

determining the difference between at least said signal and at least said supply voltage tracking signal to obtain a biasing signal; and

varying said supply voltage in proportion to said biasing signal.

5. The method of claim 4, wherein said signal is a control tracking signal indicating the desired level of said supply voltage.

6. The method of claim 4, wherein said RF signal is a modulated RF signal having a modulated RF envelope, and said signal is a control and envelope tracking signal indicating the desired level of said supply voltage and the present level of said modulated RF envelope signal.

10. An adaptable DC power consumption amplifier circuit, comprising:

an RF amplifier;

pre-amplification means, the output of said pre-amplification means alternately electrically coupled to the input of said RF amplifier and the output of said RF amplifier;

means for sensing a high RF output power condition and a low RF output power condition;

means for providing a flow of power to said RF amplifier during a high RF output power condition and impeding said flow of power to said RF amplifier during a low RF output condition, wherein said power means produces a supply voltage across said RF amplifier, and said power means is variable and has an internal source voltage;

means for electrically coupling the output of said pre-amplification means to the input of said RF amplifier during a high RF output power condition and electrically coupling the output of said pre-amplification means to the output of said RF amplifier during a low RF output power condition;

means for producing a control tracking voltage;

means for producing a supply voltage tracking voltage;

means for determining the difference between said envelope tracking voltage and said supply voltage tracking voltage to obtain a biasing voltage; and

means for varying said internal source voltage with said biasing voltage.

14. The adaptable DC power consumption circuit of claim 10, wherein said power means produces a supply current in said RF amplifier, said adaptable DC power consumption amplifier circuit further comprising:

means for producing another control tracking voltage;

means for producing a supply current tracking voltage;

means for determining the difference between said another control tracking voltage and said supply current tracking voltage to obtain a gate biasing voltage; and

means for varying said supply current in proportion to said gate biasing voltage.

11. An adaptable DC power consumption amplifier circuit, comprising:

an RF amplifier;

pre-amplification means, the output of said pre-amplification means alternately electrically coupled to the input of said RF amplifier and the output of said RF amplifier;

means for sensing a high RF output power condition and a low RF output power condition;

means for providing a flow of power to said RF amplifier during a high RF output power condition and impeding said flow of power to said RF amplifier during a low RF output condition, wherein said power means produces a supply voltage across said RF amplifier, said RF signal is a modulated RF signal having an RF modulated envelope, and said power means is variable and has an internal source voltage;

means for electrically coupling the output of said pre-amplification means to the input of said RF amplifier during a high RF output power condition and electrically coupling the output of said pre-amplification means to the output of said RF amplifier during a low RF output power condition;

means for producing a control and envelope tracking voltage;

means for producing a supply voltage tracking voltage;

means for determining the difference between said control and envelope tracking voltage and said supply voltage tracking voltage to obtain a dynamic biasing voltage; and

means for varying said internal source voltage with said dynamic biasing voltage.

12. An adaptable DC power consumption amplifier circuit, comprising:

an RF amplifier;

pre-amplification means, the output of said pre-amplification means alternately electrically coupled to the input of said RF amplifier and the output of said RF amplifier;

means for sensing a high RF output power condition and a low RF output power condition;

means for providing a flow of power to said RF amplifier during a high RF output power condition and impeding said flow of power to said RF amplifier during a low RF output condition, wherein said power means produces a supply current in said RF amplifier;

means for electrically coupling the output of said pre-amplification means to the input of said RF amplifier during a high RF output power condition and electrically coupling the output of said pre-amplification means to the output of said RF amplifier during a low RF output power condition;

means for producing a control tracking voltage;

means for producing a supply current tracking voltage;

means for determining the difference between said control tracking voltage and said supply current tracking voltage to obtain a gate biasing voltage; and

means for varying said supply current in proportion to said gate biasing voltage.

13. An adaptable DC power consumption amplifier circuit, comprising:

an RF amplifier;

pre-amplification means, the output of said pre-amplification means alternately electrically coupled to the input of said RF amplifier and the output of said RF amplifier;

means for sensing a high RF output power condition and a low RF output power condition;

means for providing a flow of power to said RF amplifier during a high RF output power condition and impeding said flow of power to said RF amplifier during a low RF output condition, wherein said power means produces a supply current in said RF amplifier, and said RF signal is a modulated RF signal having an RF modulated envelope;

means for electrically coupling the output of said pre-amplification means to the input of said RF amplifier during a high RF output power condition and electrically coupling the output of said pre-amplification means to the output of said RF amplifier during a low RF output power condition;

means for producing a control and envelope tracking voltage;

means for producing a supply current tracking voltage;

means for determining the difference between said control and envelope tracking voltage and said supply current tracking voltage to obtain a dynamic gate biasing voltage; and

means for varying said supply current in proportion to said dynamic gate biasing voltage.

15. The adaptable DC power consumption circuit of claim 13, wherein said RF signal is a modulated RF signal having an RF modulated envelope, the circuit further comprising:

means for producing another control and envelope tracking voltage;

means for producing a supply current tracking voltage;

means for determining the difference between said another control and envelope tracking voltage and said supply current tracking voltage to obtain a dynamic gate biasing voltage; and

means for varying said supply current in proportion to said dynamic gate biasing voltage.

16. An adaptable DC power consumption amplifier circuit, comprising:

an RF amplifier having an RF amplifier input terminal, an RF amplifier output terminal, and an RF amplifier power terminal;

a power supply having a power supply output terminal;

a switch having a switch input terminal, a switch output terminal, and a switch control terminal, said switch input terminal electrically coupled to said power supply output terminal;

said switch output terminal electrically coupled to said RF amplifier power terminal;

a first driver having a first driver control terminal and a first driver output terminal, said first driver output terminal electrically coupled to said RF amplifier input terminal;

a second driver having a second driver control terminal and a second driver output terminal, said second driver output terminal electrically coupled to said RF amplifier output terminal; and

a controller having at least one of a controller first output terminal and a controller second output terminal, said controller having a controller third output terminal, said at least one of said controller first output terminal and said controller second output terminal electrically coupled to said first driver control terminal and said second driver control terminal, said controller third output terminal electrically coupled to said switch control terminal.

17. The adaptable DC power consumption amplifier circuit of claim 16, wherein said controller first output terminal is electrically coupled to said first driver control terminal, and said controller second output terminal is electrically coupled to said second driver control terminal.

18. The adaptable DC power consumption amplifier circuit of claim 16, further comprising:

a third driver having a third driver input terminal, a third driver output terminal, and a third driver control terminal, said third driver input terminal electrically coupled to said RF amplifier output terminal, said at least one of said controller first output terminal and said controller second output terminal electrically coupled to said third driver control terminal; and

a fourth driver having a fourth driver input terminal, a fourth driver output terminal, and a fourth driver control terminal, said fourth driver input terminal electrically coupled to said second driver output terminal, said fourth driver output terminal electrically coupled to said third driver output terminal, said at least one of said controller first output terminal and said controller second output terminal electrically coupled to said fourth driver control terminal.

19. The adaptable DC power consumption amplifier circuit of claim 18, wherein said controller first output terminal is electrically coupled to said first driver control terminal and said third driver control terminal, and said controller second output terminal is electrically coupled to said second driver control terminal and said fourth driver control terminal.

20. An adaptable DC power consumption amplifier circuit, comprising:

an RF amplifier having an RF amplifier input terminal, an RF amplifier output terminal, and an RF amplifier power terminal;

a power supply having a power supply output terminal;

a driver having a driver control terminal and a driver output terminal;

a first switch having a first switch input terminal, a first switch output terminal, and a first switch control terminal, said first switch input terminal electrically coupled to said driver output terminal;

said first switch output terminal electrically coupled to said RF amplifier input terminal;

a second switch having a second switch input terminal, a second switch output terminal, and a second switch control terminal, said second switch input terminal electrically coupled to said driver output terminal;

a third switch having a third switch input terminal, a third switch output terminal, and a third switch control terminal, said third switch input terminal electrically coupled to said power supply output terminal;

said third switch output terminal electrically coupled to said RF amplifier power terminal; and

a controller having a controller first output terminal, a controller second output terminal, and a controller third output terminal, said controller first output terminal electrically coupled to said first switch control terminal, said controller second output terminal electrically coupled to said second switch control terminal, said controller third output terminal electrically coupled to said third switch control terminal.

21. The adaptable DC power consumption amplifier circuit of claim 20, further comprising a fourth switch having a fourth switch input terminal, a fourth switch output terminal, and a fourth switch control terminal, said fourth switch input terminal electrically coupled to said RF amplifier output terminal, said fourth switch output terminal electrically coupled to said second switch output terminal, said fourth switch control terminal electrically coupled to said controller first output terminal.

22. The adaptable DC power consumption amplifier circuit of claim 21, wherein said RF amplifier further comprises an RF amplifier control terminal, and said adaptable DC power consumption amplifier circuit further comprises a first feedback control loop electrically coupling said RF amplifier power terminal to said RF amplifier control terminal.

23. The adaptable DC power consumption amplifier circuit of claim 22, wherein said first feedback control loop comprises:

a current detector having a current detector input terminal, a current detector output terminal, and a current detector coupling terminal, said switch output terminal electrically coupled to said RF amplifier power terminal through said current detector, said current detector input terminal electrically coupled to said switch output terminal, said current detector output terminal electrically coupled to said RF amplifier power terminal;

said controller, said controller having a controller fourth output terminal; and

a signal processor having a signal processor first input terminal, a signal processor second input terminal, and a signal processor output terminal, said current detector coupling terminal electrically coupled to said signal processor first input terminal, said controller output terminal electrically coupled to said signal processor second input terminal, said signal processor output terminal electrically coupled to said RF amplifier control terminal.

24. The adaptable DC power consumption amplifier circuit of claim 23, wherein said first feedback control loop further comprises an envelope detector having an envelope detector input terminal, an envelope detector output terminal, and an envelope detector coupling terminal, said envelope detector input terminal electrically coupled to said RF amplifier output terminal, said envelope detector coupling terminal electrically coupled to said signal processor second input terminal.

25. The adaptable DC power consumption amplifier circuit of claim 22, further comprising a second feedback control loop electrically coupling said RF amplifier power terminal to said RF amplifier control terminal.

26. The adaptable DC power consumption amplifier circuit of claim 25,

wherein said first feedback control loop comprises:

a voltage detector having a voltage detector input terminal and a voltage detector output terminal, said voltage detector input terminal electrically coupled to said RF amplifier power terminal;

said controller, said controller having a controller fourth output terminal;

a first signal processor having a first signal processor first input terminal, a first signal processor second input terminal, and a first signal processor output terminal, said controller fourth output terminal electrically coupled to said first signal processor first input terminal, said voltage detector output terminal electrically coupled to said first signal processor second input terminal, said first signal processor output terminal electrically coupled to said variable power supply control terminal; and

wherein said second feedback control loop comprises;

a current detector having a current detector input terminal, a current detector output terminal, and a current detector coupling terminal, said variable power supply output terminal electrically coupled to said RF amplifier power terminal through said current detector, said current detector input terminal electrically coupled to said variable power supply output terminal, said current detector output terminal electrically coupled to said RF amplifier power terminal;

said controller;

said controller having a controller fifth output terminal;

a second signal processor having a second signal processor first input terminal, a second signal processor second input terminal, and a second signal processor output terminal, said current detector coupling terminal electrically coupled to said second signal processor first input terminal, said controller fifth output terminal electrically coupled to said second signal processor second input terminal, said voltage detector coupling terminal electrically coupled to said second signal processor second input terminal, said signal processor output terminal electrically coupled to said RF amplifier control terminal.

27. The adaptable DC power consumption amplifier circuit of claim 24,

wherein said first feedback control loop further comprises an envelope detector having an envelope detector input terminal, an envelope detector output terminal, and an envelope detector coupling terminal, said envelope detector input terminal electrically coupled to said RF amplifier output terminal, said envelope detector coupling terminal electrically coupled to said first signal processor first input terminal;

and

wherein said second feedback control loop further comprises said envelope detector, said envelope detector coupling terminal electrically coupled to said second signal processor second input terminal.