STLC3085

STLC3085 test circuits

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Appendix A STLC3085 test circuits

Referring to the application diagram shown in Figure 11 and using as external components the

Typ. Values specified in the "External Components" Table 10 find below the proper

configuration for each measurement.

All measurements requiring DC current termination should be performed using "Wandel &

Goltermann DC Loop Holding Circuit GH-1" or equivalent.

Figure 9.

2W Return Loss

2WRL = 20Log(|Zref + Zs|/|Zref-Zs|) = 20Log(E/2Vs)

Figure 10. THL Trans Hybrid Loss

THL = 20Log|Vrx/Vtx|

TIP

RING

RX

TX

STLC3085

application

circuit

W&G GH1

Zref

E

Vs

1Kohm

1Kohm

100 F

100mA

DC max

Zin = 100K

200 to 6kHz

600ohm

100 F

TIP

RING

RX

TX

STLC3085

application

circuit

W&G GH1

Vrx

Vtx

100 F

100 F

100mA

DC max

Zin = 100K

200 to 6kHz

600ohm