3.5 Sallen-KeyLow-Pass Filter
Sallen-KeyLow-Pass Filter

Figure 3–4 shows area 200 equipped with a dual operational amplifier configured as a second-order Sallen-Key low-pass filter using dual-power supplies.

Basic setup is done by proper choice of resistors R and mR, and capacitors C and nC. The transfer function is:

 

VOUT +

 

 

1

 

 

 

 

 

 

 

f ￿2 )￿j ￿￿f

 

VIN

 

 

 

 

 

1 *￿

 

 

 

 

 

￿

Where:

fo

Q

fo

 

 

 

 

 

 

 

fo +

1

 

 

 

 

2p￿m n RC

 

And

￿m n Q +m )1

Figure 3–4. Sallen-Key Low-Pass Filter Wwith Dual Supply Using Area 200

V2+

V2+

 

C206

C207

0.1 F

10 F

GND2

 

C209

C210

0.1 F

10 F

V2–

 

R221

A201–

R220

A202–

R219

A203+

mR

A204+

R217

+

R216

C215

R218

R

C211

 

 

 

R212

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Jumper

 

Vout

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

=

 

 

 

 

 

 

 

 

V2+

 

 

 

 

V

in

 

1– (f/fo)2

+ (j/Q)(f/fo)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

14

 

 

6

 

 

 

 

 

 

A2/SD

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A2OUT

 

 

 

 

3 +

 

 

 

 

 

 

 

 

 

 

 

4

 

U201A

 

 

 

 

 

 

 

1/2 Dual Op Amp

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V2–

 

 

 

 

 

 

 

 

 

fo =

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2π √

 

 

RC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

mn

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power Supply Bypass

V2+

R210

V2–

Vin

C212

R207

R215

Q =

mn

 

 

m+1

 

R214

A2 FLT

C213

 

 

 

 

 

C214

nC

 

 

C203

R211

VREF2

C

R204

B201–

R203

C202

R206

Jumper

9

 

B2/SD

 

R

C208

U202

B202–

R201

R205

12

13

B2OUT

11

 

A

R213

Voltage Reference Not Used

B203+

R202

B204+

Jumper

C204

+

U201B 1/2 Dual Op Amp

 

Not Used

R209

R208

B2 FLT

C205

C201

Example Circuits

3-5

Page 23
Image 23
Texas Instruments SLOU061A manual Sallen-Key Low-Pass Filter Wwith Dual Supply Using Area

SLOU061A specifications

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