Transcript BE-7
Rev.13.01
Switched Capacitor Filter
Copyright © S.Witthayapradit.2009
ศึกษาเกีย่ วกับหลักการทางานของสวิตช์ ประจุ
การใช้ งานวงจรรวมของสวิตช์ ประจุ
การประยกุ ต์ ใช้ กบั งานทางการแพทย์
The Basic Principle of the SC
Copyright © S.Witthayapradit.2009
S1
S2
+
R
+
v1
i
v1 v 2
i R
v1
+
v2
-
+
CR
-
v2
-
-
q 1 = CR v 1
v1 v 2
R
i
q2 = CRv2
Dq = q1-q2 = CR(v1-v2)
The Basic Principle of the SC
Copyright © S.Witthayapradit.2009
T
1
fC
T
Dq
i
DqfC fC C R v1 v2
T
v1 v2
1
Requ
i
fC C R
R equ
+
+
v1
v2
-
-
Switched Capacitor
Copyright © S.Witthayapradit.2009
0
Q1
V2
Q2
PARAMETERS:
0
3
2
3
M1
Vs
VOFF = 0
VAMPL = 0.2
FREQ = 1k
0
V
var = 1nF
1
V1
V1 = 0
V2 = 5
TD = 0
TR = 1u
TF = 1u
PW = 2u
PE R = 10 u
1
V1 = 0
V2 = 5
TD = 5u
TR = 1u
TF = 1u
PW = 2u
PE R = 10 u
Q2
V
Q1
2
M2
C1
{var}
0
RL
50K
0
CL
5nF
0
Clock Frequency(fCLK)
Copyright © S.Witthayapradit.2009
5.0V
Q1
V1 = 0
V2 = 5
TD = 5u
TR = 1u
TF = 1u
PW = 2u
PE R = 10 u
Q2
V1
0
V1 = 0
V2 = 5
TD = 0
TR = 1u
TF = 1u
PW = 2u
PE R = 10 u
2.5V
V2
0V
V(Q1)
5.0V
0
2.5V
0V
0s
25us
V(Q2)
Time
50us
Switched Capacitor
Copyright © S.Witthayapradit.2009
200mV
Q1
Q2
PARAMETERS:
3
2
3
M1
Vs
VOFF = 0
VA MP L = 0.2
FRE Q = 1 k
0
V
1
1
V
var = 1nF
2
M2
C1
{var}
0
2nF
1nF
0.5nF
Ro
50K
0
CL
5nF
0V
0
-200mV
0s
1.0ms
V(Vs:+)
2.0ms
V(Ro:1)
Time
Inverting-Amplifier. [SC]
Copyright © S.Witthayapradit.2009
1.0V
1
1
f CLK C1 100KHz 1nF
Requ
0V
3
M1
0
-
M2
C1
1nF
Ro
100
OUT
3
+
0
0
1
-1.0V
MA X4130 EUK /MXM
2
Vs
VOFF = 0
VA MP L = 0.2
FRE Q = 1 k
2
VCC
V-
2
U4
4
V
1
3
C2
100pF
5
Q2
V+
Q1
1
V
RF
50K
VE E
CL
500nF
0
0s
V(M1:D)
1.0ms
V(Ro:1)
Time
2.0ms
Switched Capacitor Filter
Copyright © S.Witthayapradit.2009
Source : Design with Operational Amplifiers and
Analog Integrated Circuits , Sergio Franco
Low Pass Filter for EMG Signal
Copyright © S.Witthayapradit.2009
Rectified EMG signal
1500
1000
500
0
0
1000
2000 3000 4000
Sample number
5000
6000
Low Pass Filter for EMG Signal
Copyright © S.Witthayapradit.2009
5th Order Unity-gain Butterworth
Low Pass Filter with fC = 10Hz
C4
C2
+
-
Input
R1
C1
+
R2
-
-
R3
+
R4
R5
Output
C5
C3
C1 = 82nF
C2 = 22nF
C4 = 390nF
R1 = 200K
C3 = 10nF
C5 = 33nF
R2 = 560K
R4 = 100K
R3 = 2M
R5 = 200K
Switched Capacitor Filter
Copyright © S.Witthayapradit.2009
5th-Order, Lowpass Filters
Elliptic Response (MAX7418/MAX7421/MAX7422/MAX7425)
Bessel Response (MAX7419/MAX7423)
Butterworth Response (MAX7420/MAX7424)
Clock-Turnable Corner Frequency (1Hz to 45kHz)
Single-Supply Operation
+5V (MAX7418–MAX7421)
8 pin
+3V (MAX7422–MAX7425)
μMAX
Low Power
3mA (Operating Mode)
0.2μA (Shutdown Mode)
Available in 8-Pin μMAX Package
W5mm. x L3mm.
Low Output Offset: ±4mV
Switched Capacitor Filter
Copyright © S.Witthayapradit.2009
fCLK >> fC
Switched Capacitor Filter
Copyright © S.Witthayapradit.2009
Design :-
Low pass Filter , 5th-Order, fC = 10Hz , Butterworth Response , ± 2.5VCC
+2.5V
4
2
IN
8
CLK
MAX7420
COSC
SHDN
MAX7420
VCC
7
OUT
OS
COM
5
6
1
GND
3
W5mm. x L3mm.
-2.5V
fCLK >> fC
fCLK
fC
100
fCLK (KHz )
k
C OSC (pF )
MAX7420 :- k = 110 x 103
Universal Switched Capacitor Filter
MF10
Copyright © S.Witthayapradit.2009
2 Filter Block on Chip
2nd Function Block
20 pin DIP
fCLK
fC
50 f fCLK
C
100
o Definition of Terms
o Modes of Operation
Universal Switched Capacitor Filter
MF10
Copyright © S.Witthayapradit.2009
o Definition of Terms
Universal Switched Capacitor Filter
MF10
Copyright © S.Witthayapradit.2009
o Modes of Operation
MODE 1 :- N1 , BP , LP (datasheet : Figure7)
MODE 1a :- Non-Inverting BP , LP (datasheet : Figure8)
MODE 2 :- N2 , BP , LP (datasheet : Figure9)
MODE 3 :- HP , BP , LP (datasheet : Figure10)
MODE 3a :- HP , BP , LP and N+OpAmp (datasheet : Figure11)
MODE 4 :- A , BP , LP (datasheet : Figure12)
MODE 5 :- BP , LP (datasheet : Figure13)
MODE 6a :- HP , LP (datasheet : Figure14)
MODE 6b :- LP Inverting & Non-Inverting (datasheet : Figure15)
Design Example : Mode 1
Copyright © S.Witthayapradit.2009
fO
R3
Q
BW
R2
Design Example
Copyright © S.Witthayapradit.2009
Universal Switched Capacitor Filter
MAX263/64
Copyright © S.Witthayapradit.2009
Universal Switched Capacitor Filter
MAX263/64
Copyright © S.Witthayapradit.2009
Universal Switched Capacitor Filter
MAX263/64
Copyright © S.Witthayapradit.2009
Universal Switched Capacitor Filter
MAX263/64
Copyright © S.Witthayapradit.2009
Universal Switched Capacitor Filter
MAX263/64
Copyright © S.Witthayapradit.2009
fCLK / fO = 166.5
10101
Q=8
N =120
1111000
วงจรกรองแถบความถีห่ ยดุ ผ่ านแบบปรับตัวสาหรับการวัดคลืน่ ไฟฟ้ าหัวใจ
Adaptive Band Stop Filter for Electrocardiograph Measurement
Copyright © S.Witthayapradit.2009
A
SC N [M A X 263]
Pin Programmable Filter
I nput
Output
Q
B
M FB
Band Pass
C
R ectifier
F
H yster esis
C ompar ator
D
C LK
E
C ompar ator
X 4
F ilter
G
P hase-Locked-Loop
H
F r equency D ivider
วงจรกรองแถบความถีห่ ยดุ ผ่ านแบบปรับตัวสาหรับการวัดคลืน่ ไฟฟ้ าหัวใจ
Adaptive Band Stop Filter for Electrocardiograph Measurement
Copyright © S.Witthayapradit.2009
0
Magnitude (dB)
Q =8
0
magnitude (dB)
-5
-10
Q =4
-20
Q =2
-30
Q =1
-10
-15
-20
-25
-30
Clock=4.4kHz
Clock=5.5kHz
-40
0
10
10
1
Frequency (Hz)
Clock=6.6kHz
Clock=7.7kHz
-35
-40 1
10
frequency (Hz)
2
10
2
10
10
3
Design Example
Copyright © S.Witthayapradit.2009
fCLK / fO = _____
fO = ______ Hz
Q = _______
BW = _______
Exercises
Copyright © S.Witthayapradit.2009
fCLK / fO = __197.92__
fCLK = _____ kHz
BW = _______
Reference
Copyright © S.Witthayapradit.2009
[1] Sergio Franco , “Design with Operational Amplifiers and
Analog Integrated Circuits” , Third edition , McGraw-Hill , 2002.
[2] James W.Nilsson , Susan A.Riedel , “Electric Circuits” , 8th
Edition , Prentice Hall , 2008.
[3] Thomas L.Floyd , “Electronic Devices” , 7th Edition , Prentice
Hall Inc. , 2005.
[4] S.Witthayapradit , S.Chitwong , S.Tumthong , “Tracking Notch
Filter For Electrocardiograph Measurement” , CCECE , 2006.
[5] http://www.maxim-ic.com , application note 3845 , 2009.
Rev.13.01
Switched Capacitor Filter
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