P1165

ETALDOC 78/22

Page 4 of 5

February 2006

PERFORMANCE CHARACTERISTICS

EUROPEAN CTR21 COMPLEX MATCH

Recommended Circ uit

Fig 5

100

LINE

270

750

910

27nF

100nF

150nF

μ

2.2 F

Recommended Circ uit

Fig 2

LINE

600

* If return loss > 16dB, 300Hz - 4kHz is a cc epta b le, blocking

c apacitor may be relaxed to

μ

6.8 F

+50

20

%*

6.8 F

+50

20

_

_

%

600

MATCH

Ω

18nF 5%

680 10%

560 2%

Recommended Circ uit

Fig 6

910

LINE

270

750

330

82nF

150nF

μ

2.2 F

0

-0.2

-0.3

-0.4

100Hz

200 300

500

1kHz

2

Frequency

dB

34 5

10

-0.1

Ty

pi

ca

l

W

or

st

C

as

e

Frequency Response

Fig 3

Figure 5 gives flat RX and TX responses against the

reference impedance (typically around

0.5dB

200Hz - 4kHz). Return loss is typically better than

20dB.

The 150nF capacitor should be of a

temperature stable dielectric.

In practice, the

100ohm resistor will normally connect to a low

impedance TX output.

For circuits with existing board drillings, figure 6

gives good return loss (>20dB) against the reference

impedance, but TX and RX flatness are degraded by

the use of this topology.

For recommended matching to other reference

impedances please contact ETAL.

+

_

-14

-22

-26

-30

100Hz

200 300

500

Typic al

Worst Ca se

1kHz

2

Frequency

dB

34 5

10

-18

Return Loss

Fig 4

Typic al

Funda mental

450Hz

-74

-72

-76

-78

-80

-10

-5

Fundamental Power (dBm)

0+ 5

Third Harmonic Distortion vs. Signal Level

Fig 7

500+ 600Hz

Typic al

1.6kHz+ 2.0kHz

Total power in line (dBm)

2 Tone Intermodula tion Products

vs. Signal Level

Fig 8

-70

-60

-80

-90

-10

-8

-6

-4

dBm

-2

0