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CA3160E Datenblatt(PDF) 4 Page - Intersil Corporation

Teilenummer CA3160E
Bauteilbeschribung  4MHz, BiMOS Operational Amplifier with MOSFET Input/CMOS Output
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Hersteller  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

CA3160E Datenblatt(HTML) 4 Page - Intersil Corporation

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4
Schematic Diagram
Application Information
Circuit Description
Refer to the Block Diagram of the CA3160 series CMOS
Operational Amplifiers. The input terminals may be operated
down to 0.5V below the negative supply rail, and the output
can be swung very close to either supply rail in many
applications. Consequently, the CA3160 series circuits are
ideal for single supply operation. Three class A amplifier
stages, having the individual gain capability and current
consumption shown in the Block Diagram provide the total
gain of the CA3160. A biasing circuit provides two potentials
for common use in the first and second stages. Terminals 8
and 1 can be used to supplement the internal phase
compensation network if additional phase compensation or
frequency roll-off is desired. Terminals 8 and 4 can also be
used to strobe the output stage into a low quiescent current
state. When Terminal 8 is tied to the negative supply rail
(Terminal 4) by mechanical or electrical means, the output
potential at Terminal 6 essentially rises to the positive supply-
rail potential at Terminal 7. This condition of essentially zero
current drain in the output stage under the strobed “OFF”
condition can only be achieved when the ohmic load
resistance presented to the amplifier is very high (e.g., when
the amplifier output is used to drive MOS digital circuits in
comparator applications).
Input Stage - The circuit of the CA3160 is shown in the
Schematic Diagram. It consists of a differential-input stage
using PMOS field-effect transistors (Q6, Q7) working into a
mirror-pair of bipolar transistors (Q9,Q10) functioning as load
resistors together with resistors R3 through R6. The mirror-
pair transistors also function as a differential-to-single-ended
converter to provide base drive to the second-stage bipolar
transistor (Q11). Offset nulling, when desired, can be effected
by connecting a 100,000
Ω potentiometer across Terminals 1
and 5 and the potentiometer slider arm to Terminal 4.
Cascode-connected PMOS transistors Q2, Q4, are the
constant-current source for the input stage. The biasing circuit
for the constant-current source is subsequently described.
The small diodes D5 through D7 provide gate-oxide protection
against high-voltage transients, including static electricity
during handling for Q6 and Q7.
Second-Stage - Most of the voltage gain in the CA3160 is
provided by the second amplifier stage, consisting of bipolar
7
4
8
1
5
2
3
BIAS CURRENT
“CURRENT SOURCE
LOAD” FOR Q11
Q2
D1
D2
D3
D4
Z1
8.3V
Q1
R1
40k
Q4
R2
5k
INPUT STAGE
D5
NON-INV.
INPUT
INV. INPUT
+
-
Q6
R3
1k
Q9
Q10
R5
1k
R6
1k
R4
1k
Q7
D6
D7
Q3
OFFSET NULL
Q11
SUPPLEMENTARY
COMP IF DESIRED
STROBING
SECOND
OUTPUT
Q8
Q12
STAGE
STAGE
Q5
V+
2k
30
pF
6
OUTPUT
NOTE: Diodes D5 Through D7 Provide Gate Oxide Protection For MOSFET Input Stage.
CURRENT SOURCE
FOR Q6 AND Q7
CA3160, CA3160A


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