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參數(shù)資料
| 型號： | LTC1562AIG#TR |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC FILTER UNIV RC QUAD LN 20SSOP |
| 標準包裝： | 1,800 |
| 濾波器類型： | 通用連續(xù)計時 |
| 頻率 - 截止或中心： | 150kHz |
| 濾波器數(shù)： | 4 |
| 濾波器階數(shù)： | 8th |
| 電源電壓： | 4.75 V ~ 10.5 V，±4.75 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SSOP |
| 包裝： | 帶卷 (TR) |
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22
LTC1562
1562fa
APPLICATIONS INFORMATION
WU
U
The configuration is robust against tolerances in the CIN1
value when fN approaches f0 (for fN/f0 ≤ 1.4, as a rule of
thumb) which is attractive in narrow transition-band fil-
ters, because of the relative cost of high accuracy capaci-
tors. Further application details appear in Part 1 of the
series of articles.
Feedforward Notches for fN < f0
Just as feedforward around an inverting bandpass section
yields a notch at the section’s f0 (Figure 11 with CIN1 = 0),
feedforward around an inverting lowpass section causes
a notch at zero frequency (which is to say, a highpass
response). Moreover, and this is what makes it useful,
introducing a capacitor for phase lead moves the notch
frequency up from DC, exactly as CIN1 in Figure 11 moves
the notch frequency up from the center frequency f0. In
Figure 14, the inverting lowpass output (V2) of the Opera-
tional Filter block is summed, at a virtual ground, with a
fed-forward input signal. Capacitor CIN1 shifts the result-
ing notch frequency, fN, up from zero, giving a low
frequency notch with a highpass shape (Figure 15). The
HBR(s) response parameters are now:
=
=
NO
QININ
N
GAIN
FF
R
C
R
H
R
1
121
11
1
2
–
The constraint required for exact cancellation of the two
paths (i.e., for infinite notch depth) becomes:
R
RC
IN
FF
QIN
2
11
1
=
R1 and C are the internal precision components (in the
LTC1562, 10k and 159pF respectively) as described above
in Setting f0 and Q.
The configuration of Figure 14 is most useful as a lower
stopband notch in a bandpass filter, because the resistors
RIN2 and RFF2 can replace the input resistor RIN of a
bandpass section made from a second Operational Filter
block, as in Figure 6a. The configuration is robust against
tolerances in the CIN1 value when fN approaches f0 (for f0/
fN ≤ 1.4, as a rule of thumb) which is attractive in narrow
transition-band filters, because of the relative cost of high
accuracy capacitors. Further application details appear in
Part 2 of the series of articles.
FREQUENCY (Hz)
10k
–60
GAIN
(dB)
–40
–20
20
100k
1M
1562 F15
0
fO = 100kHz
fN = 50kHz
Q = 1
HIGH FREQ GAIN = 0dB
fN
2
fO
2
DC GAIN = HN
()
HIGH FREQ
GAIN = HN
Figure 15. Notch Response with fN < f0
Figure 14. Feedforward Notch Configuration for fN < fO
INV
V1
2nd ORDER
1/4 LTC1562
V2
R21
RQ1
RIN1
RIN2
RGAIN
IO
RFF2
CIN1
VIN
VOUT
1562 F14
VIRTUAL
GROUND
–
+
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