OP07C Datasheet, PDF (8/21 Pages) STMicroelectronics – VERY LOW OFFSET SINGLE BIPOLAR OPERATIONAL AMPLIFIERS

OP07C, OP07D
SLOS099G – OCTOBER 1983 – REVISED NOVEMBER 2014
10 Application and Implementation
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10.1 General Application
The input offset voltage of operational amplifiers (op amps) arises from unavoidable mismatches in the
differential input stage of the op-amp circuit caused by mismatched transistor pairs, collector currents, current-
gain betas (β), collector or emitter resistors, etc. The input offset pins allow the designer to adjust for these
mismatches by external circuitry. These input mismatches can be adjusted by putting resistors or a potentiometer
between the inputs as shown in Figure 2. A potentiometer can be used to fine tune the circuit during testing or for
applications which require precision offset control. More information about designing using the input-offset pins,
see Nulling Input Offset Voltage of Operational Amplifiers (SLOA045).
20 kΩ
OFFSET N1
1
IN+ ³
+
OFFSET
N2
8
7
VCC+
6 _OUT
2
IN−
−
4
VCC_–
Figure 2. Input Offset-Voltage Null Circuit
10.2 Typical Application
The voltage follower configuration of the operational amplifier is used for applications where a weak signal is
used to drive a relatively high current load. This circuit is also called a buffer amplifier or unity gain amplifier. The
inputs of an operational amplifier have a very high resistance which puts a negligible current load on the voltage
source. The output resistance of the operational amplifier is almost negligible, so it can provide as much current
as necessary to the output load.
10 k
12 V
+
VOUT
VIN
Figure 3. Voltage Follower Schematic
8
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