Download Analog Circuits

Analog Circuits
Hiroyuki Murakami
CONTENTS
• Structure of analog circuits
• Development of wide linear range CSA system
• Problem of analog circuits
• How to resuscitate research of analog circuits
Signal Process for Nuclear
measurement System
Sensor
Analog
Signal
Processor
Digital
Signal
Processor
Output
Structure of analog signal processor
Pre-Amp.
Pulse
Amplifier
&
Shaper
ADC
Discriminator
Single-channel
Multi-channel
Pre-Amplifier
Function
• Convert the electric signal from sensor to the voltage
signal
• Drive the next stage amplifier
Specifications
• Low noise
• Low power
• Large signal
• Use of large area detector
• Wide linear range
• High density
• ・・・
Pulse amplifier & shaper
Function
• Amplification of the signal voltage
• Separation of pileup signals
• Optimization of signal to noise ratio
• Modification of pulse shape
ADC
Function
• Pulse amplitude convert to digital value
• Pulse area convert to digital value
• Pulse interval to digital value
Specification
• lower level discriminator
• Single channel
• Multichannel
The equivalent circuit of the sensor
Current source
capacitance
i(t)
C
Q(t) 


 i(t)dt
Q(t)
v(t) 
C
Trans-impedance amplifier
sensor
i
current source
in
v
in
+
capacitance


G'
Z2
C
 v
out
Z1
d
G
 G  vin



v
out
 G'i in
The equivalent circuit of the CSA
Output voltage
(s)  G(s)
V out (s)  1
1

{1 G(s)}
(s)
(s)
Z2
Z2
I
Z (s)  s
1

1
C
Z
2
(s) 
i
I(t)  Q   (t)
o
f
o
m
(s) 
m
s{C  C
i
f
o
1
s
1
 R C 
o
1

o
out
(t) 
Q 
g
o
Z (s)  R
o
o
R
C  C (1 g R )}
m
i
f
o
m
o
Z
o
(s) 
1
sC
o
(s)
1
sC o
(1 g
m
1
sC o
)}
t
Q 
 (1 ec o(c i c f )
V out (t) 
c
f
o


o  s

I(s)  g
m
I(t)  Qin  (t)
V
out
g
C
i  o  s
sC f
R
V (s)  s{C  (1 g )}
C
R
i
Z o (s)  
1

m
out
m

Q g
V
G(s)   g
in
)
gmc f
o
Input voltage
V
out

V in G
c
V (s)  g
o
in

(s 
m
1

Q
)

o
1
in
in
s
1


g
m
Z
o
sC1  sC 2 (1 g
m
Z)
o
in
I(t)  Qin  (t)



(s) 
V
in

c
g
V in (s) 
o
m
(s 
1

) Q 
in
o
gZ
sC  sC (1 g Z )
m
1
2
Q
1

C1  C 2 s  1
m
o
  Co

t
Q
vin (t)   e
C1 C 2
o
(C1  C 2)
g C
m

2
Loop Gain
log
G
G

Go: open-loop gain
O
O
O
GC: close-loop gain

2

G

G

C

1


o




Gc

G1

log
Hybrid CSA
Saturation Free CSA
non-zero loop gain AMP
MOS Switch
INPUT
output
CSA
Wide Linear Range CSA System
Charge Divider
Pulse Generator
Conventional
CSA
Non-Zero Loop Gain
CSA
Input Terminal Voltage
Input Voltage
Output Voltage
Input Terminal Voltage
Input Terminal Voltage
output Terminal Voltage
Conventional CSA
output Terminal Voltage
Non-Zero Loop Gain CSA
output Terminal Voltage
conventional CSA and Non-Zero Loop Gain CSA
• Manpower
• Research expense
• Others
• Education and Training
• ・・・