EL5177(2005) 데이터 시트보기 (PDF) - Intersil
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EL5177 Datasheet PDF : 11 Pages
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EL5177
be used. In this case, the VS- pin becomes the negative
supply rail.
For good AC performance, parasitic capacitance should be
kept to minimum. Use of wire wound resistors should be
avoided because of their additional series inductance. Use
of sockets should also be avoided if possible. Sockets add
Typical Applications
RF
parasitic inductance and capacitance that can result in
compromised performance. Minimizing parasitic capacitance
at the amplifier's inverting input pin is very important. The
feedback resistor should be placed very close to the
inverting input pin. Strip line design techniques are
recommended for the signal traces.
FBP
IN+
50
TWISTED PAIR
IN+
RT
RG
IN- EL5177
REF
50
EL5175
VO
FBN
ZO = 100Ω
IN-
REF
RF
RFR
RGR
FIGURE 24. TWISTED PAIR CABLE RECEIVER
As the signal is transmitted through a cable, the high
frequency signal will be attenuated. One way to compensate
this loss is to boost the high frequency gain at the receiver
side.
RF
GAIN
(dB)
RT RGC
RG
75
CL
DC Gain = 1 + 2----R-----F-
RG
FBP
IN+
IN-
REF
FBN
RF
(HF)Gain = 1 + R-----G---2---|-|R---R--F--G-----C--
VO+
VO-
fL
fH
fL
≅
-----------1-------------
2πRGCC
fH
≅
-------------1---------------
2πRGCCC
FIGURE 25. TRANSMIT EQUALIZER
FREQUENCY
10
FN7344.3
August 8, 2005
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