MC1596G 데이터 시트보기 (PDF) - Motorola => Freescale
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MC1596G Datasheet PDF : 12 Pages
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TYPICAL CHARACTERISTICS (continued)
FIGURE 21 – SUPPRESSION OF CARRIER HARMONIC
SIDEBANDS versus CARRIER FREQUENCY
1
o
a+
E 10
za
~g20
2-
LX-UaaZaum030
S=
AE40
g:
=E
0~au50
um
* 60
~
7n
i,05 0.1
0.5 1.0
5.0 10
50
fC, CAR RI ERFREQUENCY
(MHz)
The MCI 596/MC 1496, a monolithic
balanced modulator
cir-
cuit, is shown in Figure 23.
This circuit
consists
of an upper
quad differential
amplifier
driven
by a standard
differential
amplifier
with dual current
sources.
The output collectors
are cross-coupled
so that full-wave
balanced multiplication
of the two input voltages occurs. T@~Js,
the output signal is a constant times the product of the twdMnp@3.,
cates that the output ”spectrum
will con;st of onig~~k~h’~rn
and
difference
of the two input frequencies.
Thus,,$$>~~~b&
may be
used as a balanced modu Iator, doubly balan$e~,+y~r,
product
detector,
frequency
doubler,
and other
these particular
output signal characteris:~.e
qp~?~a$$ons
:,1:
‘i~~+~’
requiring
The lower differential
amplifier
has~~ts ~;tters
connected to
the package pins so that an extert~g$~~,~wr
resistance
may be
used.
Also, external
load resistom. ar~$employed
at the device
output
lcaO’OuT
SIGNAL
IVPUT
7 (+)
o
4 (-)
\,so
1 [+)
2
0 GAINADJuST
3
BIAS
I
v,, lo~
t:~.,:.-;
The upper quad dif~~~t~~!
amplifier
may, be operated either
in a linear
is operated
or a satu~,.~e.~.,>$,~..~t ,..*de.
The lower differential
in a li~$~~m~~
for most applications.
amplifier
For Iow-lev@[ ,@$~&%ion at both input ports, the output si9nal
will contain,d,:~fi~~=n’~
difference
frequencv
components
and have
an amplitu~
w~cE is a function
amp Iit,q:@.&..@‘:,+.<Aq,.’*}.t.~.+*
of the product
of the input signal
For’’&~~~JPevel
.;,,.,
operation
op@~WQ,-et
the modulating
at the carrier
si9nal Port,
input port
the output
and linear
si9nal will
cont$,~ sum and difference
frequency
components
of the modu -
Iating’’slgnal
frequency
and the fundamental
and dd harmonim
of
the carrier frequencv.
The output amplitude
will be a constant
times the modulating
signal amplitude.
AnV amplitude
variations
in the carrier signal will not appear in the output.
FIGURE 24 – TYPICAL MODULATOR CIRCUIT
Ik
lk
-
m
)
51
$O.lfi:
2n3
—
“c 0.1 fiF
GARRIER~}
INPUT q
Vs
-8
6
1
MC1596G
9
MODULATING
SIGNAL
INPUT
10 k
( )10
—
t
CARRIER NULL
4)
q -a Vdc
VEE
I
15
=
q -V.
I NOTE
: Pin number references pertain to this de”ice when packaged in a metal can. To ascertain the corresponding
numbers for elastic or ceramic Dackaoed devices refer to the first Daqe of this SPeCifiCati OrT sheet.
pin
MOTOROLA
@
Semiconductor Products Inc.
7
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