P2781 查看數據表（PDF） - ETAL Group

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P2781

MICROPROFILE LINE MATCHING TRANSFORMER

ETAL Group 

PERFORMANCE

600Ω MATCH

Recommended Circuit

Fig 2

600

6.8μF 20%*

LINE

6.8nF

+_ 5%

6.8nF

+_ 5%

430

+_ 2%

* If return loss > 16d B, 300Hz - 4kHz is acc eptable, b loc king

c ap a citor ma y b e rela xed to 4.7 μF +_2500%%

Frequency Response

Fig 3

0

-0.1

dB

-0.2

Typ ic a l

-0.3

-0.4

100Hz 200 300 500 1kHz

2 3 45

10

Freq ue nc y

Frequency response driven by terminal

equipment (voltage scource with 430Ω series

resistance) measured across 600Ω is within

±0.2dB 200Hz to 4kHz

Recommended Circuit

Fig 6

P2781

Return Loss

Fig 4

-14

-18

dB

-22

Worst Case

-26

Typic al

-30

100Hz 200 300 500 1kHz

2 3 45

10

Freq ue nc y

Third Harmonic Distortion vs. Signal Level

Fig 5

-60

Funda mental

450Hz

Typ ic al

-65

-70

-75

-80

-15

-10

-5

0

Fundamental Power (dBm)

Note:

To obtain harmonic distortion power in dBm, add

fundamental power in dBm to third harmonic in

dBc e.g. at -10dBm power in line at 450Hz, third

harmonic power is -10 + (-74) = -84dBm typical.

Recommended Circuit

Fig 7

The circuit of Fig. 6 gives good TX and RX

flatness (±0.3dBm 200Hz - 4kHz).

An

alternative arrangement, using existing PCB

sites, is shown in Fig. 7. Note, however, that TX

flatness will be degraded with the topology.

ETALDOC 240/14

Page 4 of 5

October 2007

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