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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： | 1/14頁 |
| 文件大?。?/td> | 569K |
| 代理商： | UAF42 |
FIGURE 1. Two-Pole Low-Pass Filter Using UAF42.
NOTE: A UAF42 and two external resistors make a unity-gain, two-pole, 1.25dB ripple
Chebyshev low-pass filter. With the resistor values shown, cutoff frequency is 10kHz.
Although active filters are vital in modern electronics, their
design and verification can be tedious and time consuming.
To aid in the design of active filters, Burr-Brown provides a
series of FilterPro computer-aided design programs. Us-
ing the FILTER42 program and the UAF42 it is easy to
design and implement all kinds of active filters. The UAF42
is a monolithic IC which contains the op amps, matched
resistors, and precision capacitors needed for a state-variable
filter pole-pair. A fourth, uncommitted precision op amp is
also included on the die.
Filters implemented with the UAF42 are time-continuous,
free from the switching noise and aliasing problems of
switched-capacitor filters. Other advantages of the state-
variable topology include low sensitivity of filter parameters
to external component values and simultaneous low-pass,
high-pass, and band-pass outputs. Simple two-pole filters
can be made with a UAF42 and two external resistors—see
Figure 1.
The DOS-compatible program guides you through the de-
sign process and automatically calculates component values.
Low-pass, high-pass, band-pass, and band-reject (or notch)
filters can be designed.
Active filters are designed to approximate an ideal filter
response. For example, an ideal low-pass filter completely
eliminates signals above the cutoff frequency (in the stop-
band), and perfectly passes signals below it (in the pass-
band). In real filters, various trade-offs are made in an
attempt to approximate the ideal. Some filter types are
optimized for gain flatness in the pass-band, some trade-off
gain variation or ripple in the pass-band for a steeper rate of
attenuation between the pass-band and stop-band (in the
transition-band), still others trade-off both flatness and rate
of roll-off in favor of pulse-response fidelity. FILTER42
supports the three most commonly used all-pole filter types:
Butterworth, Chebyshev, and Bessel. The less familiar In-
verse Chebyshev is also supported. If a two-pole band-pass
or notch filter is selected, the program defaults to a resonant-
circuit response.
Butterworth
(maximally flat magnitude). This filter has the
flattest possible pass-band magnitude response. Attenuation
is –3dB at the design cutoff frequency. Attenuation beyond
the cutoff frequency is a moderately steep –20dB/decade/
pole. The pulse response of the Butterworth filter has mod-
erate overshoot and ringing.
Chebyshev
(equal ripple magnitude). (Other transliterations
of the Russian
Heby]ov
are Tschebychev, Tschebyscheff
or Tchevysheff). This filter response has steeper initial rate
of attenuation beyond the cutoff frequency than Butterworth.
A
1
R
2
50k
A
2
A
3
R
4
50k
UAF42
11
R
1
50k
R
F1
15.8k
R
F2
15.8k
C
1
1000pF
C
2
1000pF
13
8
7
14
2
V
IN
R
3
50k
V
O
1
FILTER DESIGN PROGRAM FOR
THE UAF42 UNIVERSAL ACTIVE FILTER
By Johnnie Molina and R. Mark Stitt (602) 746-7592
APPLICATION BULLE TIN
Mailing Address: PO Box 11400 Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd. Tucson, AZ 85706
Tel: (602) 746-1111 Twx: 910-952-111 Telex: 066-6491 FAX (602) 889-1510 Immediate Product Info: (800) 548-6132
1991 Burr-Brown Corporation
AB-035C
Printed in U.S.A. July, 1993
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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