14
TAD-M600
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2
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4
A
B
C
D
E
F
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3
4
5.2 CIRCUIT DESCRIPTION
This circuit is a voltage amplifier stage of 30-dB gain.
The input block (Q101, Q102, Q103, and Q104) is a buffer
amplifier. A current mirror circuit has been adopted as a constant
current circuit. Operating it on constant current reduces any
influence of temperature drift. A diamond buffer circuit is
constructed by cross-connecting this circuit and the initial stage of
the amplifier section.
The signal voltage attribute that is input to the initial stage (Q107,
Q10
8
, Q109, and Q110) of the amplifier section is converted to
current via the current mirror circuit (Q113 <=> Q115, Q114 <=>
Q116). A Wilson Mirror circuit has been adopted as a current mirror
circuit, for higher accuracy.
The
V
/I converted current attribute is converted to voltage with the
aid of the input impedance of the SEPP circuit at the output buffer
(Q121, Q122) then output.
To improve the high-frequency characteristics, a cascode bootstrap
configuration (Q111, D101, Q112, and D102) at the initial stage
improves the high-frequency characteristics.
The negative feedback (
N
FB) is applied from the output stage to
the
β
circuit that consists of R145, R146, and R147. When the
feedback is applied to the emitter that is located at the initial stage
of the amplifier section, where the impedance is low, the
N
FB
current flows and serves as the current feedback.
As described above, a high-accuracy circuit is adopted in each
part, and a simple configuration is adopted in which the voltage
attribute is converted to current then reconverted to voltage in one
stage. Combined with a current feedback configuration, all these
features achieve a highly stable amplifier.
V+55
CN104
B4B-EH
1
2
3
4
C101
220p/125V
AMCH
C105
10p 500V
DM
C107
10p 500V
DM
C108
10P 500V
DM
C106
10p 125V
DM
D106
HZ4CLL
D102
HZ15-2L
Q121
2SC4883A(Y)
Q122
-55V
2SA1859A(Y)
R138
100 1/2W
R137
100 1/2W
R134
220 1/2W
R133
220 1/2W
Q109
2SC2240(BL)
Q107
2SC2240(BL)
2SA970(BL)
Q108
Q110
Q112
2SA970(BL)
Q111
2SC2240(BL)
2SA970(BL)
Q115
2SA970(BL)
2SA970(BL)
2SA1145(OY)
Q119
Q120
2SC2705(OY)
Q118
2SC2240(BL)
Q116
2SC2240(BL)
Q114
2SC2240(BL)
D101
HZ15-2L
2SA970(BL)
R117
100 1/4W
R118
100 1/4W
R126
100 1/4W
R125
100 1/4W
R127
33k 1/4W
R128
33k 1/4W
R129
3.9k 1/4W
R131
2.2k 1/4W
R130
1k 1/4W
Q103
2SA970(BL)
Q101
2SA970(BL)
Q104
2SC2240(BL)
Q102
2SC2240(BL)
Q106
2SC2240(BL)
Q105
Q113
2SA970(BL)
C111
100/50
C112
100/50
C110
100/50
C109
100/50
D105
HZ5CLL
R144
330 1/4W
C115
100p 125V
AMCH
C116
100p 125v
AMCH
C114
100/50
UKZ
R123
330 1/4W
C113
2.2/250
C121
2.2/250
C117
0.47/250
2SA970(BL)
R151
Q125
Q117
330 1/4W
Q126
2SC2240(BL)
VR101
5K
1
3
2
VR102
200
1
3
2
D103
SLI-343URC
D104
SLI-343URC
R109
15k 1/2W
R110
15k 1/2W
C127
2200p/125V
AMCH
C129
C125
R107
330 1/4W
R105
10k 1/4W
R111
10k 1/4W
R112
10k 1/4W
R124
R102
R106
10k 1/4W
R119
100k 1/4W
R120
100k 1/4W
R153
100 1/4W
R154
100 1/4W
R103
1k 1/4W
AMRS
R104
R101
1k 1/4W
AMRS
R115
270 1/4W
AMRS
R116
220 1/4W
AMRS
R113
47 1/4W
AMRS
R114
47 1/4W
AMRS
R121
AMRS
100 1/4W
R122
AMRS
100 1/4W
R146
750 1W
CM1
R145
750 1W
CM1
R147
CM1
47 1W
VOLTAGE AMP UNIT
IDOLE ADJ
DC ADJ
TO POWER AMP ASSY
!
!
!
!
!
!
TR-E N
TR-B N
TR-C N
GNDS
+55V
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