Amplifier with dynamatically adaptable supply voltage

• US 6,081,161 A
• Filed: 05/18/1998
• Issued: 06/27/2000
• Est. Priority Date: 05/18/1998
• Status: Expired due to Term

• Current Assignee: Intel Corporation
• Original Assignee: Omnipoint Corp. (Deutsche Telekom AG)
• Inventors: Morris, Russell A., Dacus, Farron L.
• Primary Examiner(s): Mottola, Steven J.
• Application Number:
  US09/080,811
• Time in Patent Office: 771 Days
• Field of Search: 330/127, 330/129, 330/279, 330/285, 330/296, 330/297
• US Class Current: 330/297
• CPC Class Codes: H03F 1/0211 with control of the supply voltage or current
• 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 the voltage supplied to an RF amplifier is dynamically varied from a desired level. A feedback control loop is formed between the power terminal and a control terminal of a variable voltage supply. A controller influences the feedback control loop to properly set the supply voltage at the desired minimum level necessary to maintain linear operation of the RF amplifier. The output of the RF amplifier influences the feedback control loop to dynamically vary the supply voltage from the desired level. 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 of controlling an RF amplifier, comprising:

providing power to said RF amplifier to produce a supply voltage across said RF amplifier;

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

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

determining the difference between at least said control tracking 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.

2. The method of claim 1, further comprising scaling said difference between at least said control tracking signal and at least said supply voltage tracking signal to obtain said biasing signal.

4. The method of claim 1, further comprising applying a modulated RF signal on an input terminal of said RF amplifier, said modulated RF signal having a modulated RF envelope;

and

wherein said control tracking signal is a control and envelope tracking signal that both indicates the desired level of said supply voltage and the present level of said modulated RF envelope, and said biasing signal is a dynamic biasing signal.

3. A method of controlling an RF amplifier, comprising:

providing power to said RF amplifier to produce a supply voltage across said RF amplifier;

producing a signal;

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

integrating a difference between said at least said signal and said at least said supply voltage tracking signal to obtain a biasing signal, and

varying said supply voltage in proportion to said biasing signal.

5. A method of controlling an RF amplifier, comprising:

providing power to said RF amplifier to produce a supply voltage across said RF amplifier;

applying a phase-modulated RF signal on an input terminal of said RF amplifier;

predistorting the phase of said phase-modulated RF signal;

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.

6. A method of controlling an RF amplifier, comprising:

providing power to said RF amplifier to produce a supply voltage across said RF amplifier and a supply current in said RF amplifier;

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;

varying said supply voltage in proportion to said biasing signal;

producing another signal;

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

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

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

7. The method of claim 6, wherein said signal is a control tracking signal indicating the desired level of said supply voltage, and wherein said another signal is a control tracking signal indicating the desired level of said supply current.

8. The method of claim 7, further comprising:

applying a modulated RF signal on an input terminal of said RF amplifier, said modulated RF signal having a modulated RF envelope;

wherein said signal is a control and envelope tracking signal that both indicates the desired level of said supply voltage and the present level of said modulated RF envelope, and said biasing signal is a dynamic biasing signal; and

wherein said another signal is another control and envelope tracking signal that both indicates the desired level of said supply current and the present level of said modulated RF envelope, and said gate biasing signal is a dynamic gate biasing signal.

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

an RF amplifier;

means for producing a supply voltage across said RF amplifier, said supply voltage means having an internal source voltage;

means for producing a control tracking voltage indicating the desired level of said supply voltage;

means for producing a supply voltage tracking voltage;

means for determining the difference between said control 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.

10. The adaptable DC power consumption amplifier circuit of claim 9, wherein said control tracking voltage is a control and envelope tracking voltage and said biasing voltage is a dynamic biasing voltage.

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

an RF amplifier;

means for producing a supply voltage across said RF amplifier, said supply voltage means having an internal source voltage;

means for producing a voltage;

means for producing a supply voltage tracking voltage;

means for determining the difference between said control 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,

means for producing a supply current in said RF amplifier;

means for producing another voltage;

means for producing a supply current tracking voltage;

means for determining the difference between said another 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.

12. The adaptable DC power consumption amplifier circuit of claim 11, wherein said voltage is a control tracking voltage and said another voltage is another control tracking voltage.

13. The adaptable DC power consumption amplifier circuit of claim 11, wherein said voltage is a dynamic control tracking voltage, said another voltage is another dynamic control tracking voltage, said biasing voltage is a dynamic biasing voltage, and said gate biasing voltage is a dynamic gate biasing voltage.

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

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

a variable power supply having a variable power supply control terminal, a variable power supply output terminal, and an internal source voltage, said variable power supply output terminal electrically coupled to said RF amplifier power terminal;

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;

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

17. The adaptable DC power consumption amplifier circuit of claim 14, further comprising 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 first input terminal.

18. The adaptable DC power consumption amplifier circuit of claim 17, wherein said signal processor comprises a subtractor and an amplifier.

19. The adaptable DC power consumption amplifier circuit of claim 18, wherein said signal processor comprises an integrator.

20. The adaptable DC power consumption amplifier circuit of claim 18, wherein said voltage detector comprises a voltage divider, said envelope detector comprises a directional coupler, and said signal processor comprises a differential operational amplifier, said signal processor first input terminal electrically coupled to the noninverting input terminal of said differential operational amplifier, said signal processor second input terminal electrically coupled to the inverting input terminal of said differential operational amplifier, and said signal processor output terminal electrically coupled to the output terminal of said differential operational amplifier.

21. The adaptable DC power consumption amplifier circuit of claim 17, wherein said variable power supply comprises:

an N number of batteries that produce said internal source voltage; and

an N number of transistors, said N number of batteries respectively electrically coupled to said N number of transistors;

the bases of said N number of transistors electrically coupled to said variable power supply control terminal.

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

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

a variable power supply having a variable power supply control terminal, a variable power supply output terminal, and an internal source voltage, said variable power supply output terminal electrically coupled to said RF amplifier power terminal;

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

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

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

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

a variable power supply having a variable power supply control terminal, a variable power supply output terminal, and an internal source voltage, said variable power supply output terminal electrically coupled to said RF amplifier power terminal;

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;

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; and

a signal processor having a signal processor first input terminal, a signal processor second input terminal, and a signal processor output terminal, said envelope detector coupling terminal electrically coupled to said signal processor first input terminal, said voltage detector output terminal electrically coupled to said signal processor second input terminal, and said signal processor output terminal electrically coupled to said variable power supply control terminal.

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

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

a variable power supply having a variable power supply control terminal, a variable power supply output terminal, and an internal source voltage, said variable power supply output terminal electrically coupled to said RF amplifier power terminal; and

a first feedback control loop, said RF amplifier power terminal electrically coupled to said variable power supply control terminal through said first feedback control loop; and

a second 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 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;

a controller having a controller output terminal; and

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 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

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; and

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 output terminal electrically coupled to said second signal processor second input terminal, said second 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 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.

25. The adaptable DC power consumption amplifier circuit of claim 24, wherein said RF amplifier comprises:

a preceding gain stage having a preceding gain stage power terminal, said preceding gain stage power terminal electrically coupled to said current detector output terminal, said RF amplifier control terminal electrically coupled to the gate of said preceding gain stage; and

a final gain stage having a final gain stage power terminal, said variable power supply output terminal electrically coupled to said final gain stage power terminal.

26. The adaptable DC power consumption circuit of claim 25 wherein, said first signal processor comprises a subtractor and an amplifier, said second signal processor comprises a subtractor, amplifier, and integrator, and said current detector comprises a current mirror.

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

wherein said first signal processor comprises a first differential operational amplifier, said first signal processor first input terminal electrically coupled to the noninverting input terminal of said first differential operational amplifier, said first signal processor second input terminal electrically coupled to the inverting input terminal of said first differential operational amplifier, said first signal processor output terminal electrically coupled to the output terminal of said first differential operational amplifier;

and

wherein said second signal processor comprises a second differential operational amplifier, said second signal processor first input terminal electrically coupled to the inverting input terminal of said second differential operational amplifier, said second signal processor second input terminal electrically coupled to the noninverting input terminal of said first differential operational amplifier, said second signal processor output terminal electrically coupled to the output terminal of said second differential operational amplifier.

28. The adaptable DC power consumption amplifier circuit of claim 27, wherein said controller comprises:

a control processing unit; and

a digital-to-analog converter, said control processing unit electrically coupled to said digital-to-analog converter through at least one digital control line.

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

a voltage detector;

a controller; and

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 voltage detector electrically coupled between said first signal processor second input terminal and said RF amplifier power terminal, said controller electrically coupled to said first signal processor first 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;

said controller; and

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 coupled between said variable power supply output terminal and said second signal processor first input terminal, said controller electrically coupled to said second signal processor second input terminal, said second signal processor output terminal electrically coupled to said RF amplifier control terminal.

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

a voltage detector;

an envelope detector; and

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 voltage detector coupled between said first signal processor second input terminal and said RF amplifier power terminal, said envelope detector electrically coupled between said RF amplifier output terminal and said first signal processor first 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;

said envelope detector; and

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 coupled between said variable power supply output terminal and said second signal processor first input terminal, said envelope detector electrically coupled between said RF amplifier output terminal and said second signal processor second input terminal, said second signal processor output terminal electrically coupled to said RF amplifier control terminal.

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

a voltage detector;

a controller;

an envelope detector; and

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 voltage detector electrically coupled between said first signal processor second input terminal and said RF amplifier power terminal, said controller electrically coupled to said first signal processor first input terminal, said envelope detector electrically coupled between said RF amplifier output terminal and said first signal processor first 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;

said controller;

said envelope detector; and

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 coupled between said variable power supply output terminal and said second signal processor first input terminal, said controller electrically coupled to said second signal processor second input terminal, said envelope detector electrically coupled between said RF amplifier output terminal and said second signal processor second input terminal, said second signal processor output terminal electrically coupled to said RF amplifier control terminal.

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

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

a variable power supply having a variable power supply control terminal, a variable power supply output terminal, and an internal source voltage, said variable power supply output terminal electrically coupled to said RF amplifier power terminal;

a voltage detector;

a controller;

an envelope detector; and

a signal processor having a signal processor first input terminal, a signal processor second input terminal, and a signal processor output terminal, said voltage detector electrically coupled between said signal processor second input terminal and said RF amplifier power terminal, said controller electrically coupled to said signal processor first input terminal, said envelope detector electrically coupled between said RF amplifier output terminal and said signal processor first input terminal, said signal processor output terminal electrically coupled to said variable power supply control terminal.