LT1568
15
1568f
Table 5. Resistor Values in Ohms, 4th Order Lowpass
Chebyshev,
±0.25dB Passband Ripple, Gain = 1
fCUTOFF (MHz)
R11, R21
R31
R12, R22
R32
1
1.87k
2.05k
2.21k
634
2
931
1.05k
1.10k
324
3
604
681
698
205
4
453
511
499
154
5
357
402
383
121
6
287
332
309
100
7
243
287
255
86.6
8
205
249
215
76.8
9
178
221
182
66.5
10
154
196
158
61.9
Amplitude Response 4th Order Lowpass Chebyshev,
±0.25dB Passband Ripple, fCUTOFF = 1MHz
FREQUENCY (MHz)
0.1
–60
GAIN
(dB) –48
–36
–24
–12
110
20
1568 TA13
–72
–84
–96
–108
0
12
4th ORDER LOWPASS FILTER DESIG S
U
Transient Response 4th Order Lowpass Chebyshev,
±0.25dB Passband Ripple, fCUTOFF = 1MHz
INPUT
500mV/DIV
OUTPUT
200mV/DIV
1
s/DIV
1568 TA16
Table 6. Resistor Values in Ohms, 4th Order Lowpass Bessel,
Gain = 1
fCUTOFF (MHz)
R11, R21
R31
R12, R22
R32
1
715
1.15k
1.91k
324
2
357
562
432
365
3
237
374
280
243
4
174
280
205
187
5
137
221
162
147
6
115
187
130
124
Amplitude Response
4th Order Lowpass Bessel, fCUTOFF = 1MHz
FREQUENCY (MHz)
0.1
–60
GAIN
(dB) –48
–36
–24
–12
110
20
1568 TA17
–72
–84
–96
–108
0
12
Transient Response
4th Order Lowpass Bessel, fCUTOFF = 1MHz
INPUT
500mV/DIV
OUTPUT
200mV/DIV
1
s/DIV
1568 TA18
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.