0

,

B93501044

B93501062

B93902025

1

ECG

1. ECG

ECG 20 fc=60Hz notch filter

60Hz fc=45Hz low-pass filter

fc=0.5Hz

2. Instrutment Amplifier

CMRR ECG mV

1. ECG

2.

Frequency

1.0Hz 3.0Hz 10Hz 30Hz 100Hz 300Hz 1.0KHzV(N00814)/ V(V3:+)

443.36

443.40

443.44

443.48

3.

1.0 3.0 10.0 30.0 100.0 300.0 1K (Hz)

Gain

443.48

443.44

443.40

443.36

2

4 2

3 1

43 511 1 262.3

1 10

R R K KGain

R R K K

= + = + =

Labview 35dB

ECG

3. Notch Filter Notch filter Twin-T Notch 60Hz

60Hz

5. Twin-T notch filter

Frequency

1.0Hz 3.0Hz 10Hz 30Hz 100Hz 300Hz 1.0KHzV(N03443) / V(V1:+)

0

0.5

1.0

1.0 3.0 10.0 30.0 100.0 300.0 1K (Hz)

Gain

1

0.5

0

6. Twin-T notch filter

4. (Labview)

3

1,2 0QR R

0 0

1 160

2 2 2.7 1cf Hz

R C M n = =

2

1

15

4 2 100Q

Q

R kQ

R= = =

notch filter 60Hz -35dB notch

60Hz -70dB notch filter 60Hz

4. Low-pass Filter

ECG 0.7 30Hz

45Hz

9. Low-Pass Filter

7. Notch Filter (Labview)

9. Notch Filter

8. Notch Filter (Labview)

4

Frequency

1.0Hz 3.0Hz 10Hz 30Hz 100HzV(N01375) / V(V1:+)

0

2.0

4.0

6.0

,1 ,2 ,3

1 2 1 2 1 2 1 2

1 1 145 ; 45 ; 45

2 2 2c st c nd c rd

a a a a b b b b

f Hz f Hz f HzRC R R C C R R C C

= = = = = =

3 32 3

4 4

1; 1a bnd rda b

R RQ Q

R R= = = =

45Hz 45Hz

12dB

10. Low-Pass Filter

1.0 3.0 10.0 30.0 100.0 (Hz)

Gain

4

2

0

6

11. (Labview)

5

Frequency

10mHz 30mHz 100mHz 300mHz 1.0Hz 3.0Hz 10HzV(N00242) / V(V1:+)

0

1.0

2.0

3.0

5. High-pass Filter

1 1

10.5

2cf Hz

R C= =

3

4

1R

QR

= =

Labview 1Hz (Labview)

0.5Hz (Baseline drift)

12. High-Pass Filter 13. High-Pass Filter

10m 30m 100m 300m 1.0 3.0 10 (Hz)

Gain

3

2

1

0

6

ECG

Instrutment

Am

plifier

Notch

Filter 1

Notch

Filter 2

5th O

der

Low-pass F

ilter

Filter

HP

F

14. ECG

15. ECG (Labview)

7

16. ECG

17. ECG

8

1.1.1.1. 60Hz

60Hz notch filter 60Hz ADC

2. SNR

60Hz

3.3.3.3.

OPA

ADC

quantilize,

4.

()

18. ECG Matlab ECG

9

ECG

ECG

5.5.5.5. ()

impulse noise?

intermodulation

19. ECG ECG

20. ECG

10

Pspice Pspice

Simulation always work!

ECG

ECG

amplifier, notch

low-passhigh-pass filter

preamplifier filter differential amplifier low passhigh

pass notch

bug

bode plot scale scale

0

[1] High-speed notch filters [On-line], Bruce Carter, Texas Instruments Incorporated

[2] Active Low-Pass Filter Design [On-line], Jim Karki, Texas Instruments Incorporated

[3] Filter Design in Thirty Seconds [On-line], Bruce Carter, Texas Instruments Incorporated