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PANASONIC TX14S3T/W
Service Manual


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

Description of PANASONIC TX14S3T/W 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 9 (click to view)
Philips Semiconductors

100 â 450 MHz 250 W Power Ampliï¬er with the BLF548 MOSFET

Application Note AN98021

In order to compensate for the 6 dB/octave slope, matching to Zin is achieved at 450 MHz. At lower frequencies a mismatch is created, resulting in a decrease of powergain inversely proportional to the increase of the gain related to the transistorâs 6 dB/octave slope. The network listing of the input circuitry, again presented as a 3-port, is given in âAppendix Bâ. The network response (both input returnloss and predicted powergain) is given in Fig.4. Finally the schematic diagram and list of components are given in Fig.5. The unitâs layout is given in Fig.6. Note: two toroidal cores around T2 and T3 are used to prevent oscillations. 5 5.1 ADJUSTMENT OF THE AMPLIFIER Tuning the outputnetwork

In order to terminate the transistor with the proper load impedance, first the output network has to be tuned. The transistor was replaced by a dummyload, representing the transistors output impedance under full power conditions. The dummyload was realized after fitting the data of Table 3. To the dummyload model (roughly Rload in parallel with Coss, in series with draininductance Ld). Later the model was compensated for parasitics of both SOT262 header and network components. Initial settings for each side of the dummyload are: Rload = Vds2/2 à Pl = 5.2 ⦠C = 1.15 à Coss = 104 pF L = Ld = 0.5 nH The network listing is given in âAppendix Câ. The final result, the dummyload lay-out, is given in Fig.7.

handbook, halfpage

20

MGH787

(1)

10

0
(2)

â10

â20 100

200

300

400 500 frequency (MHz)

(1) DB [S12]. (2) DB [S22].

Fig.4 Simulated network response of inputside (predicted Gp = f(f)).

1998 Mar 23

9

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