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FDS6612A датащи(PDF) 9 Page - Microsemi Corporation

номер детали FDS6612A
подробное описание детали  EVALUATION KIT
Download  18 Pages
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производитель  MICROSEMI [Microsemi Corporation]
домашняя страница  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

FDS6612A датащи(HTML) 9 Page - Microsemi Corporation

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LXE1710 EVALUATION BOARD
USER GUIDE
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
Copyright
© 2000
Rev. 1.1, 2000-12-01
APPLICATION INFORMATION
 !  &' ( 
LX1710 Filter Implementation, 1-stage vs. 2- stage
0.001
100
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
10
20
50
0.55626
0.12572
50m
30
100m
200m
500m
1
2
5
10
2025.04
1.15
Watts(W)
2-Stage
1-Stage
FILTER DESIGN TRADEOFFS (1-STAGE VS. 2-STAGE)
A 1-stage or 2-stage filter may be used depending on
your application and performance targets. The main
tradeoff
in
this
selection
is
price
(number
of
components,
component
costs,
PCB
area)
vs.
performance.
The primary advantage of the single
stage filter is lower cost whereas the main benefit to a
2-stage filter is that it will provide steeper attenuation.
This allows the corner frequency to be selected further
outside of the audio band (to minimize the effects of
impedance variations in the passband) and still
provide adequate RF attenuation.
Single Stage Filter Advantages
Low Cost: The 1-stage LC filter uses one half
the number of inductors/capacitors resulting in
a substantial cost savings over a 2-stage
design.
Key parameters such as THD+N,
frequency response, and nose performance
do not change significantly.
Power Loss: Since current will flow in two
inductors and not four, the inductor power loss
will be less in the single stage design.
The
overall amplifier will have a wider dynamic
range and improved efficiency.
Filter Design: This easy-to-design filter can
limit audio signal changes within +/- 3dB
across
the
audio
band
with
impedance
vari
"  )  *+ ,!  
a
steeper
rolloff
with
the
2-stage
filter,
impedance changes could result in a +/- 6dB
change.
THD: There are minimal differences between
the 1-stage and 2-stage implementations with
other parameters such as THD+N as seen in
the above graph.
Single Stage Filter Disadvantages
EMI and Switching Frequency: For the 1-
stage, the switching frequency must be higher
than 400kHz to ensure the corner frequency
will provide adequate amplifier performance in
the high end of the audio frequency range. If
fS < 400kHz, then fC < fS /10 = 40kHz which is
too close to the desired audio band. A higher
oscillation
frequency
could
translate
into
greater MOSFET switching losses, slightly
lower efficiency, and increased EMI effects.
With a 2-stage 4th order filter, the switching
frequency fS can be reduced to 120kHz. If fS =
120kHz, then fC = fS /3 = 40kHz. The lower
oscillation frequency could help minimize EMI
issues.
LC FILTER DESIGN
The output filter helps to reconstruct the amplified
audio signal and filter out the switching frequency.
The design of the filter depends on the type of
attenuation and frequency response desired at the
output.
The output filter designed into the LXE1710


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