12 V

+

VIN

VOUT

10 k

NE5534, NE5534A, SA5534, SA5534A

SLOS070D – JULY 1979 – REVISED NOVEMBER 2014

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9.2 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 11. Voltage Follower Schematic

9.2.1 Design Requirements

•

Output range of 2 V to 11 V

•

Input range of 2 V to 11 V

9.2.2 Detailed Design Procedure

9.2.2.1 Output Voltage Swing

The output voltage of an operational amplifier is limited by its internal circuitry to some level below the supply

rails. For this amplifier, the output voltage swing is within ±12 V, which accommodates the input and output

voltage requirements.

9.2.2.2 Supply and Input Voltage

For correct operation of the amplifier, neither input must be higher than the recommended positive supply rail

voltage or lower than the recommended negative supply rail voltage. The chosen amplifier must be able to

operate at the supply voltage that accommodates the inputs. Because the input for this application goes up to

11 V, the supply voltage must be 12 V. Using a negative voltage on the lower rail rather than ground, allows the

amplifier to maintain linearity for inputs below 2 V.

12

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