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Tektronix 454A User Manual

Tektronix 454A
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F
i g
.
3- 8
.
Si mpl i f i e
d
ci r c
u
i t
of
Push- Pul l
Am
p
l i f i er
st ages
.
h
i g
h
er
gai n-
b
an
d
wi
d
t
h
p
r o
d uct
t
h
anzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
±
si ngl e
p
ai r
of
t r ansi s-
t or s
.
T
h
e
i m
p
r oved
r es
p
onse
r esul t s
f r om
t
h
e
r e
d
u
ct i on
i n
mi l l er
cap aci t ance of
t
h
e
f i r st
pai r
of
t r ansi st or s
( commo
n
emi t t er ) b
eca
u
se of
t
h
e
l ow
i n
p ut
i m
p
e d
ance
of
t
h
e
secon
d
p
ai r
of
t r ansi st or s
( common
base)
.
F
i r st
Push- Pul l
Am
p
l i f i er
.
T
h
i s
st age h
as
l ess
t
h
an
u
ni t y
c u
r r ent
gai n
at
l ow
f r e
q u
enci es,
b ut
t
h
e
cur r ent
gai n
at
h
i g
h
er
f r e
qu
enci es
r i ses
d
ue
t o
t
h
e
com
p
ensat i
n
g
net wor
k
i n
t
h
e
emi t t er
ci r cui t
of
Q324
an
d
Q424
.
T
he
si gnal at
t
h
e
col l ect or s
of
Q354- Q454
i s
connect e
d
t o
t
h
e
emi t t er s
of
Q364- Q464
t
h
r oug
h
T
h
e
emi t t er
pea
k
i ng
net wor
k
,
C426- 13426,
compensat es
C355-
R
355-
R
356-
R
357
an
d
C455-
R
455-
R
456-
R
457
.
R
355
f or t
h
e
h
i g
h
- f r e
q
ue
n
cy
r ol l of f
at
t
h
e
ver t i cal
d
ef l ect i on
an
d
R
455
p
r ovi
d
e
d
am
p
i ng
f or
t
h
e
col l ect or s
of
p
l at es
d
ue
t o
t
h
e
t er mi nat i on
r esi st a
n
ce
an
d
t
h
e
capaci t ance
Q354- Q454
.
Tr ansf or mer
¤
358
r e
d
uces
t
h
e
common- mo
d
e
of
t
h
e
out
p
u
t
t r ansi st or s,
0394
and
Q494
.
Di o
d
es
si gnal
com
p
onent s
i n
t
h
e
push- pul l
si gnal
a
pp
l i e
d t o
t
h
e
C
R
323- C
R
324- C
R
325
al ong
wi t
h
t
h
er mi st or
R
424
p r ovi de
f ol l owi ng
st ages
.
V
e
r
t i cal
Si g
n
al
f
r
om
Del ay
L
i
n
e
R
s
%
.
S345
F
i g
.
3- 7
.
V
er t i cal
Out put
Ampl i f i er
d
et ai l e
d b
l oc
k
d
i agr am
.
Ci r cui t
Descr i p
t i on- 454
/
R
454A
BW
- BEAM
F
I
N
DER
Second- - -
1
0
Å.
ÁÅ
.
~
V
e
r
t i cal
F
i
r
st
Push- - _- - __j
Push- Pul l
-
.
~
¡ Å
s6-
¡ Å
-
Def l ect i o
n
Pul l
Ampl i f i er
m
Á
l ¯
f i e
r
A
m
p
Q374,
Q388
Si gnal
t o
Q324,
0
334
0354,
0364
V
e
r
t i cal
0424,
0454,
Q
4
94,
Q474,
Def l ect i o
n
0434
½
0464
¹
Q494
P
l at es
t
h
er mal
compensat i on
t o p
r ovi
d
e
b
andwi dt
h
st a
b
i l i zat i on
.
T
h
e d
i o
d
es
ar e
h
el
d
r ever se
b
i ased
an d
t
h
ey
a
pp
ear
i n t
h
e
ci r cui t
as
±
posi t i ve
t em
per at ur e
coef f i ci ent
ca
p
aci t a
n
ce
.
T
h
er mi st or
R
424
h
as
±
negat i ve
t em
per at
u
r e
coef f i ci ent
.
R
424
an
d
t
h
e
d
i o
d es
h
ave ± pea
k
i ng
ef f ect
w
h
i c
h
i ncr eases
wi t h
t em
per at ur e
t o co
u
nt er act
t
h
e o
pp
osi t e
t e
n
d
ency
of
t
h
e b
asi c
am
p
l i f i er
.
T
h
e
V
er t i cal
P
osi t i o
n
Cent er i ng
a
dj u
st -
ment ,
R
334,
a
dj
ust s
t
h
e
qu
i escent
DC
l evel s
i n
t
h
e
V
er t i cal
O
u t p
ut
Am
p
l i f i er
ci r cui t
t o
pr ovi
d
e ± cent er e d
t r ace
w
h
en
t
h e
i n
p
ut s
of
t h e
am
p
l i f i er
ar e
at
t
h e
same
p
ot ent i al
( s
h or t e d
t oget h
er )
.
Second
Push- Pul l
Am
p
l i f i er
.
T
h
e
net wor
k
C337- 1_334
L
337-
R
333
an
d
C437-
L
433-
L
435-
L
437
i n
t
h e base
ci r cui t
of
Q354- Q454
p
r ovi
d
es
i n
d
uct i ve
p
ea
k
i ng f or
C353-
R
353
f or
o
pt i mum
f r e
q
uency
r es
p
onse
.
B
an
d
wi
d
t
h
l i mi t i ng
i s
p
r ovi de d
by
r el ay
š
442
w
h
en
t
h
e
BANDWI DTH- BEAM
F
I
N
D
ER
swi t c h
,
S345,
i s
i n t
h
e
20
MH
z p
osi t i on
( up)
.
Wh
en
š 442
i s
act uat e d
±
f i l t er
com
p ose
d
of
C335- C435-
L
335-
L
435
i s
connect e
d
bet ween
t
h
e
bases of
Q354- Q454
w
h
i c
h
l i mi t s
t
h
e
ban
d
wi dt
h
of
t
h
e
am
p
l i f i er
t o a
b
out
20
mega
h
er t z
.
I n
t
h
e
BEAM
F
I
N
D
ER
p
osi t i on,
t
h
i s
swi t c
h
l i mi t s
t
h
e
gai n
of
Q354- 13454
t o
com
p
r ess
an
of f - scr een
d
i s
p
l ay
wi t
h
i n
t
h
e
gr at i cul e
ar ea
.
N
or mal l y,
t
he emi t t er
cur r ent
f or
Q354- Q454
i s
sup
p
l i e
d
t
h
r oug
h
p
ar al l el
p
at
h
s
S345- 1_343
an d
R
340
.
Wh
en
S345
i s
i n
t
h
e
BEAM
F
I
N
D
ER
p
osi t i on,
t
h
e
cur r ent
sour ce
t
h
r oug
h
S345- 1_343
i s
i n-
t er r u
p
t ed
and
t
h
e
onl y
emi t t er
cur r ent
sour ce
f or
Q354-
Q454
i s
t
h
r oug
h
R
340
.
W
i t
h
cur r ent
bei ng
su
p
p
l i e
d
onl y
t
h
r oug
h
R
340,
t
h
e
emi t t er cur r ent
of
t
h
i s
st age
dr o
p
s
t o
about
15%
of
t
he
nor mal
val ue
an d
t
h
e
di s-
pl ay
i s
com
p
r esse
d
ver t i cal l y
wi t
h
i n t
h
e
gr at i cul e
ar ea
.
3- 11

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Tektronix 454A Specifications

General IconGeneral
BrandTektronix
Model454A
CategoryTest Equipment
LanguageEnglish

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