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Active 1-kHz Filter for Distortion Measurement

Better Measurements Through Optimization of the Measurement Signal

Active 1-kHz Filter for Distortion Measurement
Active 1-kHz Filter for Distortion Measurement
The detection of low-level signal distortions places great demands not only on the dynamic range and linearity of the measuring device, but also on the measuring signal supplied to the component that is being tested. With a downstream filter, however, even average signal generators can deliver high-quality measurement signals.
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Materials

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Bill of Materials

Component List: Low-Pass

Resistors:

(Thin film, 1%, SMD 0603)

R1 = 47 k

R2, R5, R9, R17, R21, R23 = parallel connection *

R3 = 5k11

R4 = 11 k

R6, R12, R18, R24 = gain, not applicable *

R7, R13, R19, R25 = 3k48

R8 = 6k19

R10, R16 = 8k25

R11 = 129 k

R14 = 3k83

R15 = 28k7

R20 = 4k64

R22, R27, R28 = 10 k

R26 = 220 Ω

 

Capacitors:

(Unless specified otherwise: 5%, COG, SMD0805)

C1, C3, C5, C7, C9, C11, C13, C15 = parallel connection *

C2 = 18 n

C4, C8 = 15 n

C6 = 22 n

C10 = 47 n

C12 = 12 n

C14 = 100 n

C16 = 3n3

C17, C18, C19, C20 = electrolytic capacitor 22 µ / 20 V, SMD-B

C21, C22, C23, C24 = 100 n, SMD0603

 

Semiconductor:

LED1, LED2 = LED, green, SMD0805

IC1, IC2 = NE5532A, SO08

 

Also:

K1, K9 = 2-pin male connector, RM 1/10″

K2..K5 = 3-pin male connector, RM 1/10″

 

* See text

Component List: Band-Pass

Resistors:

(Thin film, 1%, SMD 0603)

R1 = 3k6

R2, R12 = parallel connection *

R3, R5 = 1k78

R4 = 23k7

R6, R23, R24 = 46k4

R7, R17 = 1 k

R8, R18 = 511 Ω

R9 = 13k9

R10, R25, R26 = not applicable *

R11 = 0 Ω

R13 = 1k62

R14 = 19k6

R15 = 1k2

R16 = 82 k

R19, R21, R22 = 10 k

 

Capacitors:

(Unless specified otherwise: 5%, COG, SMD0805)

C1, C4, C5, C8, C9 = 100 n, SMD1206

C2, C3, C6, C7 = parallel connection *

C10 = not applicable

 

Semiconductor:

LED1, LED2 = LED, green, SMD0603

IC1 = OPA2209AIDR, SO08

 

Also:

K8, K9 = 2-pin male connector, RM 1/10''

K2..K5 = 3-pin male connector, RM 1/10''

 

* See text

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