XRT5897IV View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT5897IV' PDF : 20 Pages View PDF
XRT5897
This may be further simplified:
RT
I
Vs
Veq
Figure 10. Equivalent Circuit
Where:
RT = RSint + Rsext
Req
=
RL
n2
Therefore:
I=
RT
Vs
+ Req
Veq = I Req
Vo = n Veq
And:
Return Loss
=
20 log
RT + Req
RT-- Req
Table 6. contains the results of calculations made with these equations. The numbers show that output pulse amplitude
is within millivolts of the nominal values of 2.37V and 3.00V specified by ITU G.703 for 75W and 120W operation. Also,
the 1:2 ratio transformer provides an almost-perfect match for 75W operation, and return loss is well within the ETSI
specification for the 120W load.
Rev. 1.10
Load Resistance
RL (W)
75
120
Pulse Amplitude
Vo (Volts Peak)
2.43
3.01
Output
Return Loss (dB)
31.3
13.8
Table 6. Calculated Transmitter Pulse Amplitude and Return Loss
18
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