Wideband, minimum-rating filters and multicouplers for power amplifiers

• US 6,552,634 B1
• Filed: 10/02/2000
• Issued: 04/22/2003
• Est. Priority Date: 08/25/1997
• Status: Expired due to Fees

• Current Assignee: Frederick Herbert Raab
• Original Assignee: Frederick Herbert Raab
• Inventors: Raab, Frederick Herbert
• Primary Examiner(s): Shingleton, Michael B
• Application Number:
  US09/676,525
• Time in Patent Office: 932 Days
• Field of Search: 333/32, 333/213, 333/214, 333/216, 330/53, 330/124.R, 330/302
• US Class Current: 333/216
• CPC Class Codes: H03F 1/0205 in transistor amplifiers
• CPC Class Codes: H03F 1/565 using inductive elements
• CPC Class Codes: H03F 2200/429 Two or more amplifiers or one amplifier with filters for different frequency bands are coupled in parallel at the input or output
• CPC Class Codes: H03F 3/602 Combinations of several amplifiers
• CPC Class Codes: H03H 7/48 Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source phase shifters providing two or more output signals H03H7/21

Abstract

A method and a circuit for power amplification over a wide frequency range based upon the use of minimum-rating filters or matching networks, negative-component signal processing, and single or multiple amplifiers. The filters and matching networks are preferably designed to minimize the required ratings of the amplifier(s) driving them. The signal processor or generator preferably uses negative components to produces a driving signal that is compensated for the ripple in the filter, matching network, and load. The outputs of multiple amplifiers optimized for different frequency ranges can be combined into a single load with flat frequency response, resistive loads presented to the amplifiers, and no inherent power loss in the combining network.

Claims

1. A method for coupling an input signal to a load through an electronic network, said network having n components, an input, and an output and said output being coupled to the load, said method comprising:

the n steps of selecting each of the n components of said network so that the input of the network has a minimum-rating characteristic, whereby a specified amount of signal power is delivered to the load at any frequency within a specified frequency band with input voltage and input current no larger than specified ratings.

2. An electronic network operable by the method recited in claim 1.

3. A system comprising an amplifier and the network of claim 2, the amplifier being coupled to the input of the network.

4. A network as recited in claim 2, further comprising a load-sensing means for measuring load characteristics and means for varying values of the components of the network in response to said load characteristics, whereby the minimum-rating, impedance, and attenuation characteristics of the network are maintained.

5. A system comprising an amplifier and the network of claim 4, the amplifier being coupled to the input of the network of claim 4.

6. A method for filtering using an electronic network as recited in claim 1, wherein the components of the network are further chosen so that the network has specified filtering characteristics, said filtering characteristics including attenuation and impedance.

7. An electronic filter operable by the method recited in claim 6.

8. A system comprising an amplifier and the network of claim 7, the amplifier being coupled to the input of the network of claim 7.

9. A method for impedance transformation and matching using an electronic network as recited in claim 1, wherein the components of the network are further chosen so that the network provides impedance transformation and matching.

10. A matching network operable by the method recited in claim 9.

11. A system comprising an amplifier and the network of claim 10, the amplifier being coupled to the input of the network of claim 10.

12. A method for broadbanding using an electronic network as recited in claim 1, wherein the components of the network are further chosen so that the network expands the bandwidth over which power can be delivered to the load.

13. A broadbanding network operable by the method recited in claim 12.

14. A system comprising an amplifier and the network of claim 13, the amplifier being coupled to the input of the network of claim 13.

15. A method for amplifying multiple signals and delivering amplified signals to a load through a system, said system having one or more inputs and a single output, the system comprising:

(a) multiple amplifiers and

(b) multiple output networks;

the system being organized so that;

(i) each system inputs is coupled to one individual amplifiers,

(ii) the output of each amplifier is coupled to an network,

(iii) the outputs of the output networks are coupled to the system output, and

(iv) the system output is coupled to the load;

said method comprising for each network the n steps of selecting each of the n components of said network so that the input of each network has a minimum-rating characteristic,

and the passbands of each network being separated so that one network does not significantly load another network significantly;

whereby each amplifier delivers a specified amount of signal power to the load at any frequency within a specified frequency band with input voltage and input current no larger than specified ratings.

16. A system operable by the method recited in claim 15.

17. A system as recited in claim 16 in which the network outputs are coupled in parallel to the load.

18. A system as recited in claim 16 in which the network outputs are coupled in series to the load.

19. A system as recited in claim 16, further comprising one or more load-sensing means for measuring load characteristics and one or more means for varying values of the components of the output networks in response to said load characteristics, whereby the minimum-rating, impedance, and attenuation characteristics of the output networks are maintained.

20. A method for coupling an input signal to a load through an electronic network, said network having n components, one or more inputs, and an output and said output being coupled to the load, said method comprising:

the n steps of selecting each of the n components of said network so that the input of the network has a minimum-rating characteristic, whereby a specified amount of signal power is delivered to the load at any frequency within a specified frequency band with input voltage and input current no larger than specified ratings.

21. A method for coupling an input signal to a load through an electronic network and delivering a specified amount of signal power to the load at any frequency within a specified frequency band, said network having n components, an input, and an output and said output being coupled to the load, said method comprising the n steps of:

selecting each of the n components of said network so that the input of the network has a minimum-rating characteristic, whereby said specified amount of signal power is delivered to the load at any frequency within a specified frequency band with input voltage and input current no larger than specified ratings.

22. A method for delivering multiple signals to a load through a system, said system having one or more system inputs and a system output, said system comprising multiple output networks;

the system being organized so that;

(i) each system input is coupled to an-output-network input,

(ii) the output-network outputs are coupled to the system output, and

(iii) the system output is coupled to the load;

said method comprising for each output network the n steps of selecting each of the n components of said network so that the input of each network has a minimum-rating characteristic, and the passbands of each network being separated so that one network does not significantly load another network significantly;

whereby each amplifier delivers a specified amount of signal power to the load at any frequency within a specified frequency band with input voltage and input current no larger than specified ratings.