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PANASONIC TX21S4TL
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of PANASONIC TX21S4TL Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 7 (click to view)
Philips Semiconductors

Two-tone Linearity in a 900 MHz Silicon Bipolar Class AB Ampliï¬er
4 CONCLUSION

Application Note AN98026

Using the typical characteristics of a silicon bipolar transistor in the class AB mode, it is possible to improve IMD for medium and high output power levels by adding a series resistor in the base bias network. This simple and reliable method allows the power amplifier to be operated in the class AB mode, which increases amplifier and overall system efficiency considerably. The presented class AB amplifier shows an IMD performance of better then â32 dBc over a 40 dB dynamic range up to 10 W PEP. This performance makes it possible to use the amplifier in a feedforward system, meeting a â60 dBc IMD requirement. The trade-off is a slight increase in gain compression over the total dynamic range. A good selection of Icq and the series resistor value will give a usable compromise. 5 REFERENCES

1. Philips Semiconductors data sheet. BLV910 UHF Power Transitor. 2. P.B. Kenington, âEfficiency of Feedforward Amplifiers, IEEE Proceeding-G, Vol. 139, No. 5, October 1992, pp. 592-593. 3. Eid E. Eid, Fadhel M. Ghannouchi, Francois Beauregard, âOptimal Feedforward Linearization System Design,â Microwave Journal, Vol. 38, No. 11, November 1995, pp. 78-86. Korne Vennema received his B Eng degree in electrical engineering from the Hogere Technische School in Utrecht, the Netherlands in 1987. In March 1987, he joined Philips Semiconductors in Nijmegen, the Netherlands, where he worked as a development engineer on the design of RF power transistors. Since July 1993, Vennema has been with Philips Semiconductors, Slatersville, RI, as an RF application and product engineer.

1998 Mar 23

7

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