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參數資料
| 型號： | UAF42 |
| 英文描述： | UNIVERSAL ACTIVE FILTER |
| 中文描述： | 通用有源濾波器 |
| 文件頁數： | 12/14頁 |
| 文件大?。?/td> | 569K |
| 代理商： | UAF42 |
12
Q ENHANCEMENT
When the f
O
Q product required for a pole-pair section is
above
≈
100kHz at frequencies above
≈
3kHz, op amp gain-
bandwidth limitations can cause Q errors and gain peaking.
To mitigate this effect, the program automatically compen-
sates for the expected error by decreasing the design-Q
according to a Q-compensation algorithm
(1)
. When this
occurs, the value under the Q heading on the
UAF42 Filter
Component Values
print-out will be marked with an asterisk
indicating that it is the theoretical Q, not the actual design
Q. The actual design Q will be shown under an added
heading labeled Q
COMP
.
USING THE FilterPro PROGRAM
With each data entry, the program automatically calculates
filter performance. This allows you to use a “what if”
spreadsheet-type design approach. For example; you can
quickly determine, by trial and error, how many poles are
needed for a desired roll-off.
GETTING STARTED
The first time you use the program, you may want to follow
these suggested steps.
Type
FILTER42
<ENTER>
to start the program.
Use the arrow keys to move the cursor to the
Filter
Response
section.
1) SELECT FILTER RESPONSE
Press
<ENTER>
to toggle through four response choices:
Low-pass
High-pass
Band-pass
Notch (band-reject)
When the desired response appears, move the cursor to the
Filter Type
section.
2) SELECT FILTER TYPE
Move the cursor to the desired filter type and press
<ENTER>
. The selected filter type is highlighted and marked
with an asterisk. There are four filter-type choices:
Butterworth
Chebyshev
If you choose Chebyshev, you must also enter ripple (i.e.
pass-band ripple—see Chebyshev filter description).
If you choose Inverse Chebyshev, you must also enter A
MIN
(i.e. min attenuation or max gain in stop-band—see Inverse
Chebyshev filter description).
Bessel
Inverse Chebyshev
3) ENTER FILTER ORDER
Move the cursor to the
Filter Order
line in the
Parameters
section. Enter filter order
n
(from 2 to 10).
4A) ENTER FILTER FREQUENCY
Move the cursor to the
Filter Frequency
line in the
Param-
eters
section.
Low-pass/high-pass filter: enter the f
–3dB
or cutoff frequency.
Band-pass filter: enter the center frequency, f
CENTER
.
Band-reject (notch) filter: enter the notch frequency, f
NOTCH
.
If your filter is low-pass or high-pass, go to step 5.
4B) ENTER FILTER BANDWIDTH
If the filter is a band-pass or band-reject (notch), move the
cursor to the bandwidth line and enter bandwidth.
If you press
<ENTER>
with no entry on the bandwidth line,
you can enter f
L
and f
H
instead of bandwidth. f
L
and f
H
are
the f
–3dB
points with regard to the center frequency for
Butterworth and Bessel filters. They are the end of the
ripple-band for Chebyshev types. This method of entry may
force a change in center frequency or notch frequency.
5) PRINT-OUT COMPONENT VALUES
Press function key
<F4>
to print-out
Filter Component
Values
and a
Filter Block Diagram
. Follow the instructions
in the filter implementation section of this bulletin to as-
semble a working filter.
USING THE PLOT FEATURE
A Plot feature allows you to view graphical results of filter
gain and phase vs frequency. This feature is useful for
comparing filter types.
To view a plot of the current filter design, press
<F2>
.
GRAPHIC DISPLAY COMMANDS
While viewing the graphic display, several commands can
be used to compare filter responses:
<F1>
or
S
—
S
aves the plot of the current design for future
recall.
<F2>
or
R
—
R
ecalls the
S
aved plot and plots it along with
the current design.
<F3>
or
Z
—Plots a
Z
ero dB reference line.
GRAPHIC DISPLAY CURSOR CONTROL
While viewing the graphics display you can also use the
arrow keys to move a cursor and view gain and phase for
plotted filter responses.
RESISTOR VALUES
With each data entry, the program automatically calculates
resistor values. If external capacitors are needed, the pro-
gram selects standard capacitor values and calculates exact
resistor values for the filter you have selected. The
1%
Resistors
option in the Display menu can be used to calcu-
late the closest standard 1% resistor values instead of exact
resistor values. To use this feature, move the cursor to the
resistors
line in the
Filter Response
section and press
(1) L.P. Huelsman and P. E. Allen,
Theory and Design of Active
Filters
, p. 241.
相關PDF資料 |
PDF描述 |
|---|---|
| UAF42AP | UNIVERSAL ACTIVE FILTER |
| UAF42AU | UNIVERSAL ACTIVE FILTER |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| UAF42 AP | 制造商:Texas Instruments 功能描述:IC FILTER UNIVERSAL ACTIVE |
| UAF42 AU | 制造商:Texas Instruments 功能描述:IC UNIVERSAL ACTIVE FILTER SMD 制造商:Texas Instruments 功能描述:IC, UNIVERSAL ACTIVE FILTER, SMD |
| UAF42AP | 功能描述:有源濾波器 Universal Active Filter RoHS:否 制造商:Maxim Integrated 通道數量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| UAF42AP | 制造商:Texas Instruments 功能描述:IC FILTER UNIVERSAL ACTIVE DIP14 |
| UAF42AP | 制造商:Texas Instruments 功能描述:IC FILTER UNIVERSAL ACTIVE DIP14 制造商:Texas Instruments 功能描述:IC, FILTER UNIVERSAL ACTIVE, DIP14 |
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