Cross-differential amplifier

• US 7,342,457 B2
• Filed: 12/12/2006
• Issued: 03/11/2008
• Est. Priority Date: 03/11/2002
• Status: Expired due to Term

• Current Assignee: California Institute of Technology
• Original Assignee: California Institute of Technology
• Inventors: Hajimiri, Seyed-Ali, Aoki, Ichiro, Kee, Scott D.
• Primary Examiner(s): Choe; Henry
• Application Number:
  US11/638,639
• Publication Number:
  US 20070096828A1
• Time in Patent Office: 455 Days
• Field of Search: 330/285, 330/296, 330/297, 330/298
• US Class Current: 330/297
• CPC Class Codes: H03F 1/0211 with control of the supply voltage or current
• CPC Class Codes: H03F 2200/507 A switch being used for switching on or off a supply or supplying circuit in an IC-block amplifier circuit
• CPC Class Codes: H03F 2200/537 A transformer being used as coupling element between two amplifying stages
• CPC Class Codes: H03F 2200/541 Transformer coupled at the output of an amplifier
• CPC Class Codes: H03F 2203/45464 the CSC comprising one or more coils
• CPC Class Codes: H03F 2203/45704 the LC comprising one or more parallel resonance circuits
• CPC Class Codes: H03F 2203/45731 the LC comprising a transformer
• CPC Class Codes: H03F 3/04 with semiconductor devices only
• CPC Class Codes: H03F 3/191 Tuned amplifiers H03F3/193, H03F3/195 take precedence
• CPC Class Codes: H03F 3/217 Class D power amplifiers; Switching amplifiers
• CPC Class Codes: H03F 3/2176 Class E amplifiers
• CPC Class Codes: H03F 3/45475 using IC blocks as the active amplifying circuit
• CPC Class Codes: H03F 3/605 Distributed amplifiers
• CPC Class Codes: H03F 3/68 Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics power amplifiers using a combination of several semiconductor amplifiers H03F3/211; combinations of amplifiers using coupling networks with distributed constants H03F3/602

Abstract

A cross-differential amplifier is provided. The cross-differential amplifier includes an inductor connected to a direct current power source at a first terminal. A first and second switch, such as transistors, are connected to the inductor at a second terminal. A first and second amplifier are connected at their supply terminals to the first and second switch. The first and second switches are operated to commutate the inductor between the amplifiers so as to provide an amplified signal while limiting the ripple voltage on the inductor and thus limiting the maximum voltage imposed across the amplifiers and switches.

Claims

1. A device utilizing a cross-differential amplifier comprising:

an inductor connected to a power source at a first terminal;

switch means for reducing a voltage ripple on the inductor; and

a plurality of amplifiers connected to the switch means.

2. The device of claim 1 further comprising a class inverse F load coupled to an output of the cross-differential amplifier.

3. The device of claim 1 comprising a class D load coupled to an output of the cross-differential amplifier.

4. The device of claim 1 comprising a class E/F_xx load coupled to an output of the cross-differential amplifier.

5. The device of claim 1 comprising a class E/F_odd load coupled to an output of the cross-differential amplifier.

6. The device of claim 1 comprising a class E load coupled to an output of the cross-differential amplifier.

7. The device of claim 1 comprising a class E/F_xx load coupled to an output of the cross-differential amplifier.

8. The device of claim 1 comprising a switch for reducing a voltage ripple on the inductor at a radio frequency.

9. A system utilizing a cross-differential amplifier comprising:

an inductor;

a first active device connected to the inductor for reducing the voltage ripple on the inductor; and

second active device means for amplifying a signal, the second active device means connected to the first active device to form an output.

10. The system of claim 9 wherein the second active device means is operated as a controlled current source.

11. The system of claim 9 wherein the second active device means amplifies the signal at a radio frequency.

12. The system of claim 9 comprising a class E load coupled to the output.

13. The system of claim 9 comprising a class E/F_xx load coupled to the output.

14. The system of claim 9 comprising a class E/F_odd load coupled to the output.

15. A method for operating a cross-differential amplifier comprising:

step means for operating a first switch and a second switch to reduce a voltage ripple on an inductor;

step means for operating a third switch and a fourth switch to generate an output; and

step means for forming a first current path containing a power source and a second current path containing the power source.

16. The method of claim 15 comprising step means for operating the cross differential amplifier at a radio frequency of operation.

17. The method of claim 15 comprising step means for operating the first and second switches at a radio frequency of operation.

18. The method of claim 15 comprising step means for operating the first, second and third switches at a radio frequency of operation.

19. The method of claim 15 comprising step means for operating the first, second, third, and fourth switches at a radio frequency of operation.