12 V

+

10 k

OUT

VCC

VCC+

IN−

IN+

+

−

OFFSET N1

3

2

4

7

6

20 k

Ω

N2

OFFSET

8

1

–

OP07C, OP07D

SLOS099G – OCTOBER 1983 – REVISED NOVEMBER 2014

www.ti.com

10 Application and Implementation

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).

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.

Figure 3. Voltage Follower Schematic

8

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