Time (7.5 Ps/Div)

Load current = 200 mA

Prec

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+

±

100Ÿ

Load

GND

V+

V-

9NŸ

1NŸ

GND

22

OPA207

SBOS826D – DECEMBER 2017 – REVISED OCTOBER 2019

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Typical Applications (continued)

8.2.3 Precision Buffer With Increased Output Current

The OPA207 can be configured as illustrated in Figure 50 to drive low impedance loads. In Figure 50, the

OPA207 is configured in a gain of +10 V/V, and the output current is boosted by the NPN (2N2904) and PNP

(2N2906) bipolar transistors. For low output voltages the OPA207 supplies the load current directly through the

100-Ω resistor. The bipolar transistors begin to supply current when the voltage drop across the 100-Ω resistor

exceeds approximately 500 mV. Figure 50 illustrates the results for a 50-Ω load resistor driven with a 10-V step

at the output. This results in a 200-mA current supplied by the circuit.

Figure 50. Precision Buffer (G = 10 V/V) With High Output Drive Capability

Figure 51. 50-Ω Load Driven With a 10-V Step