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參數(shù)資料
| 型號(hào)： | LT1061 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | High Performance Triple Universal Filter Building Block(高性能通用型三濾波器組件) |
| 中文描述： | 三高性能通用濾波器積木（高性能通用型三濾波器組件） |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 290K |
| 代理商： | LT1061 |
10
LTC1061
ODES OF OPERATIO
W
U
center frequencies, Qs, and notch frequencies are (f
O1
=
0.969, Q1 = 54.3, f
n1
= 0.84, f
O2
= 1.031, Q2 = 54.3, f
n2
=
1.187, f
O3
= 1, Q3 = 26.2). The output of the filter is the BP
output of Side A, Pin 2.
Lowpass filters with stopband notches can also be realized
by using Figure 12 provided that 6th order lowpass filter
approximations with 2 stopband notches can be synthe-
sized. Literature describing elliptic double terminated (RLC)
Figure 14. Resistor Values and Amplitude Response of Figure 12
Topology. The Bandpass Filter is Centered Around 2600Hz when
Operating with a 130kHz Clock.
Figure 13. Resistor Values and Amplitude Response of
Figure 12 Topology. The Notch is Centered at 2600Hz.
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
R32
V
IN
LTC1061 F12
LTC1061
R22
R
h
2
R42
R31
R41
R33
R23
T
2
L, CMOS
CLOCK INPUT
V
–
V
+
NOTES: FOR NOTCH RESPONSES, PIN 7 SHOULD BE
PREFERABLY CONNECTED TO GROUND AND THE
FILTER OUTPUT IS PIN 3.
FOR BANDPASS OR LOWPASS RESPONSES, PIN 7
CAN BE EITHER AT GROUND OR POSITIVE SUPPLY,
AND THE FILTER OUTPUT IS PIN 2 OR PIN 1.
R
l
2
R
l
1
R21
R11
R
h
1
Figure 12. 6th Order Elliptic Bandpass, Lowpass
or Notch Topology
Figure 13 shows the measured frequency response of the
circuit Figure 12 configured to provide a notch function.
The filter output is taken out of pin 3. The resistor values
are standard 1%.
The ratio of the 0dB width, BW1, to the notch width BW2,
is 5:1 and matches the theoretical design value. The
measured notch depth was –53dB versus –56dB theoreti-
cal and the clock-to-center notch frequency ratio is 100:1.
Figure 14 shows the measured frequency response of the
circuit topology, Figure 12, but with pole/zero locations
configured to provide a high Q, 6th order elliptic bandpass
filter operating with a clock-to-center frequency ratio of
50:1 or 100:1. The theoretical passband ripple, stopband
attenuation and stopband to ripple bandwidth ratio are
0.5dB, 56dB, 5:1 respectively. The obtained results with
1% standard resistor values closely match the theoretical
frequency response. For this application, the normalized
f
IN
(kHz)
1.0
V
O
/
I
–10
3.0
1061 F14
–30
–60
–80
1.5
2.0
2.5
3.5
–50
–40
–20
0
–70
–90
V
S
= ±5V
f
CLK
= 130kHz
R11 = 576k
R31 = 562k
R
11 = 28.7k
R22 = 10.7k
R42 = 10k
R
2 = 10k
R33 = 75k
NOTE: FOR CLOCK FREQUENCIES
ABOVE 500kHz, CONNECT A 5pF
IN PARALLEL WITH R41 AND R42.
R21 = 10k
R41 = 10.7k
R
11 = 40.2k
R32 = 562k
R
2 = 14k
R23 = 2.94k
STANDARD 1%
RESISTOR VALUES
f
IN
(kHz)
1.0
V
O
/
I
–10
3.0
1061 F13
–30
–60
–70
1.5
2.0
2.5
3.5
–50
–40
–20
0
BW1
BW2
2.6kHz
STANDARD 1%
RESISTOR VALUES
R11 = 165k
R31 = 143k
R
1 = 10k
R22 = 20k
R42 = 15.4k
R
2 = 10k
R33 = 169k
NOTES: USE A 15pF CAPACITOR
BETWEEN PINS 17 AND 18.
PIN 7 IS GROUNDED.
R21 = 10k
R41 = 13k
R
1 = 10.5k
R32 = 221k
R
2 = 10.5k
R23 = 84.5k
V
S
= ±5V
f
CLK
= 260kHz
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