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CA3280A Arkusz danych(PDF) 6 Page - Intersil Corporation

Numer części CA3280A
Szczegółowy opis  Dual, 9MHz, Operational Transconductance Amplifier (OTA)
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Producent  INTERSIL [Intersil Corporation]
Strona internetowa  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

CA3280A Arkusz danych(HTML) 6 Page - Intersil Corporation

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6
of the CA3280. The linearization diode impedance also
decreases as the diode bias current increases, which further
loads the input. The diodes, in addition to acting as a
linearization network, also operate as an additional
attenuation system to accommodate input signals in the volt
range when they are applied through appropriate input
resistors.
Figure 10 shows a triangle wave to sine wave converter
using the CA3280. Two 100k
Ω resistors are connected
between the differential amplifier emitters and V+ to reduce
the current flow through the differential amplifier. This allows
the amplifier to fully cut off during peak input signal
excursions. THD is appropriately 0.37% for this circuit.
FIGURE 4. VOA SHOWING LINEARIZATION DIODES AND
CURRENT DRIVE
FIGURE 5. BLOCK DIAGRAM OF LINEARIZED VOA
FIGURE 6. DIFFERENTIAL TO SINGLE ENDED CONVERTER
FIGURE 7. TYPICAL GAIN CONTROL CIRCUIT
V+
VOA
V-
RD = SMALL SIGNAL DIODE
IMPEDANCE
RD
52
ID(mA)
x 1.34 =
70
ID
IABC
ID
RD
VOA
ID
IABC
4
1/2
+
-
13
15
16
3
2k
1
CA3280
14
+15V
68k
SINGLE-
ENDED
OUTPUT
DIFFERENTIAL
2k
INPUT
10k
-15V
4
1/2
+
-
13
15
16
14
10k
3
CA3280
1
V+ = +15V
68k
OUTPUT
21VP-P
14mV AGC
330k
15k
V- = -15V
FEEDTHRU
400
µV
NOISE AT
MAX GAIN
20k
10k
600
10VP-P
INPUT
V+
V-
100k
VOLTAGE
CONTROL
CA3280, CA3280A


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