Claims
- 1. A multiple band transmitter, comprising:
a first transmit amplifier path conducting a first transmit signal at a first frequency band; and a second transmit amplifier path conducting a second transmit signal at a second frequency band, said second transmit amplifier path comprising:
an amplifier that generates said second transmit signal and a harmonic frequency within a passband of said first transmit amplifier path; and a trap circuit, coupled to an output of said amplifier, that shunts said harmonic frequency away from said first transmit amplifier path.
- 2. The multiple band transmitter of claim 1, wherein said trap circuit comprises a series LC circuit.
- 3. The multiple band transmitter of claim 2, wherein said series LC circuit is tuned to a second harmonic frequency of said second frequency band.
- 4. The multiple band transmitter of claim 2, wherein said series LC circuit comprises a load that cooperates with remaining portions of said second transmit amplifier path to optimize power throughput of said second transmit signal along said second transmit amplifier path.
- 5. The multiple band transmitter of claim 1, wherein said trap circuit comprises a transmission line.
- 6. The multiple band transmitter of claim 5, wherein said transmission line is tuned to a second harmonic frequency of said second frequency band.
- 7. The multiple band transmitter of claim 5, wherein said transmission line has a length which is approximately one-half wavelength of a second harmonic frequency of said second frequency band.
- 8. The multiple band transmitter of claim 1, wherein said first transmit amplifier path conducts said first transmit signal at a frequency band of approximately 5 gigahertz, and wherein said second transmit amplifier path conducts said second transmit signal at a frequency band of approximately 2.45 gigahertz.
- 9. The multiple band transmitter of claim 8, wherein said first and second transmit amplifier paths form a transmitter portion of a dual band wireless local area network transceiver.
- 10. A multiple band transmitter, comprising:
a plurality of amplifier paths, each amplifying a corresponding transmit signal at a corresponding frequency band; said plurality of amplifier paths including a first amplifier path that generates a harmonic frequency within a passband of at least one other of said plurality of amplifier paths; and a trap circuit, coupled to said first amplifier path, that shunts said harmonic frequency to ground.
- 11. The multiple band transmitter of claim 10, wherein said trap circuit comprises a series LC circuit.
- 12. The multiple band transmitter of claim 11, wherein said series LC circuit is tuned to said harmonic frequency.
- 13. The multiple band transmitter of claim 11, wherein said series LC circuit comprises a load that cooperates with remaining portions of said first amplifier path to optimize power throughput.
- 14. The multiple band transmitter of claim 10, wherein said trap circuit comprises a transmission line.
- 15. The multiple band transmitter of claim 14, wherein said transmission line is tuned to said harmonic frequency.
- 16. The multiple band transmitter of claim 14, wherein said transmission line has a length which is approximately one-half wavelength of said harmonic frequency.
- 17. The multiple band transmitter of claim 10, wherein said first amplifier path includes a power amplifier having an output that generates said harmonic frequency, and wherein said trap circuit is coupled at an output of said power amplifier.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional Application No. 60/436,061 filed on Dec. 20, 2002, entitled “HARMONIC SUPPRESSION FOR A MULTI-BAND TRANSMITTER” (ATTY Docket No. INSL:0072P), and claims the benefit of U.S. Provisional Application No. 60/438,829 filed on Jan. 9, 2003, entitled “HARMONIC SUPPRESSION FOR A MULTI-BAND TRANSMITTER” (ATTY Docket No. INSL:0072P2), both of which are herein incorporated by reference for all intents and purposes.
Provisional Applications (2)
|
Number |
Date |
Country |
|
60436061 |
Dec 2002 |
US |
|
60438829 |
Jan 2003 |
US |