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Design Guidelines for TERIDIAN 78P235x LIUs
RETURN LOSS MATCHING CIRCUIT
Meeting the 15dB return loss requirements at the CMI-coded coax ports often requires a significant amount of
engineering hours due to the unique impedance characteristics of each system design, particularly at frequencies
above 200MHz. Return loss is a parameter that can only be measured at the system level. Evaluating any
individual component’s return loss won’t be efficient and will provide misleading results.
For challenging environments where the coax connector, transformer, and LIU are not located near each other or
even on the same card, a flexible termination scheme is required to meet the return loss performance for both
transmit and receive paths. The diagram in Figure 8 below shows a suggested circuit to optimize the impedance
on the transmission lines by adding discrete component footprints right near the transformers in the differential
paths. The capacitance (C) and inductance (L) values are unique for each design and will generally be in the
range of a few nH or pF.
Transformer Dual CT
T1
VCC
C
R
75
75
BNC
BAV99
L
C
75
R
75
BAV99
BNC
BAV99
0.1uF
L
To LIU
C
R
75
L
BAV99
C
R
75
L
Figure 8. (Optional) Discrete components to improve the return loss
75
Page 8 of 15
? 2008 Teridian Semiconductor Corp.
Rev 2.1
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相关PDF资料
79-WHITE-1"X60YD
TAPE GLASS CLOTH 1"X 60YD WHT
79059-2701
CONN RECEPT R/A 50POS 4-40 SCSI
79059-2702
CONN RECEPT R/A 68POS 4-40 SCSI
79059-2726
CONN RECEPT R/A 50POS 2-56 SCSI
79278
TAPE CLR ESD YEL STRIPE 2"X72YDS
796014-2
CONN CHAMP GUIDE PIN .050
796055-2
CONN RCPT 68POS .8MM R/A
796068-1
CONN RCPT 40POS .050 VERT
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