LT1568

15

1568f

Table 5. Resistor Values in Ohms, 4th Order Lowpass

Chebyshev,

±0.25dB Passband Ripple, Gain = 1

R11, R21

R31

R12, R22

R32

1

1.87k

2.05k

2.21k

634

Ω

2

931

Ω

1.05k

1.10k

324

Ω

3

604

Ω

681

Ω

698

Ω

205

Ω

4

453

Ω

511

Ω

499

Ω

154

Ω

5

357

Ω

402

Ω

383

Ω

121

Ω

6

287

Ω

332

Ω

309

Ω

100

Ω

7

243

Ω

287

Ω

255

Ω

86.6

Ω

8

205

Ω

249

Ω

215

Ω

76.8

Ω

9

178

Ω

221

Ω

182

Ω

66.5

Ω

10

154

Ω

196

Ω

158

Ω

61.9

Ω

Amplitude Response 4th Order Lowpass Chebyshev,

FREQUENCY (MHz)

0.1

–60

–48

–36

–24

–12

110

20

1568 TA13

–72

–84

–96

–108

0

12

4th ORDER LOWPASS FILTER DESIG S

Transient Response 4th Order Lowpass Chebyshev,

INPUT

500mV/DIV

OUTPUT

200mV/DIV

1

µs/DIV

1568 TA16

Table 6. Resistor Values in Ohms, 4th Order Lowpass Bessel,

Gain = 1

R11, R21

R31

R12, R22

R32

1

715

Ω

1.15k

1.91k

324

Ω

2

357

Ω

562

Ω

432

Ω

365

Ω

3

237

Ω

374

Ω

280

Ω

243

Ω

4

174

Ω

280

Ω

205

Ω

187

Ω

5

137

Ω

221

Ω

162

Ω

147

Ω

6

115

Ω

187

Ω

130

Ω

124

Ω

Amplitude Response

FREQUENCY (MHz)

0.1

–60

–48

–36

–24

–12

110

20

1568 TA17

–72

–84

–96

–108

0

12

Transient Response

INPUT

500mV/DIV

OUTPUT

200mV/DIV

1

µs/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.