Le79555
Data Sheet
Figure 7. Two-Wire Return Loss
ZD = 600
Ω
A (TIP)
VTX
RT1
75 k
75 k
Ω
Ω
SLIC
R
R
300
Ω
Ω
VM
VS
AGND
RSN
CT1 = 180 pF
RT2
ZIN = 600
Ω
300
B (RING)
ZD: The desired impedance;
eg., the characteristic impedance of the line
RRX = 150 k
Ω
Return loss = –20 log (2V M / VS)
Figure 8. RFI
L1
C1
50
Ω
200
200
Ω
Ω
A (TIP)
RF1
RF2
CAX
33 nF
VAB
B (RING)
50
Ω
HF
GEN
C2
VTX
CBX
33 nF
50
Ω
L2
SLIC device
under test
1.5 Vrms
80% Amplitude
Modulated
100 kHz to 30 MHz
15
Zarlink Semiconductor Inc.