NCV2904DMR2G 데이터 시트보기 (PDF) - ON Semiconductor

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NCV2904DMR2G

Single Supply Dual Operation Amplifier

ON Semiconductor 

LM258, LM358, LM358A, LM358E, LM2904, LM2904A, LM2904E, LM2904V, NCV2904

Vref

=

1

2

VCC

Vref

Triangle Wave

Output

+

1/2

R3

LM358

-

75 k

R1

C

Vref

100 k

R2

300 k

+

1/2

LM358

-

Rf

f = R1 + RC

4 CRf R1

R2 R1

if, R3 =

R2 + R1

Figure 15. Function Generator

VCC

C

R3

R1

C

Vin

-

1/2

LM358

R2

+

Vref

VO

CO

CO = 10 C

Vref =

1

2

VCC

Square

Wave

Output

Given: fo = center frequency

A(fo) = gain at center frequency

Choose value fo, C

Then:

R3 =

Q

p fo C

R3

R1 = 2 A(fo)

R2

=

R1 R3

4Q2 R1 -R3

For less than 10% error from operational amplifier. Qo fo < 0.1

BW

Where fo and BW are expressed in Hz.

If source impedance varies, filter may be preceded with voltage

follower buffer to stabilize filter parameters.

Figure 16. Multiple Feedback Bandpass Filter

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