7 Parameter Measurement Information

The various test setup configurations for the OPA955 are shown in Figure 7-1, Figure 7-2, and Figure 7-3. When

configuring the OPA955 in a gain of +20V/V and +40V/V, set the feedback resistor RF to 909Ω.

Figure 6-1 shows 5dB of peaking with the amplifier in an inverting configuration of –7V/V with the amplifier

configured as shown in Figure 7-2. The 50Ω matched termination of this circuit configuration results in the

amplifier being configured in a noise gain of 5.3V/V, which is lower than the recommended +7V/V.

+

±

RG

453

2.5 V

í2.5 V

50-

Source

50

GND

GND

50-

Measurement

System

50

50

GND

RG values depend on gain configuration

169

71.5

GND

Figure 7-1. Noninverting Configuration

+

±

2.5 V

í2.5 V

50-

Source

GND

GND

50-

Measurement

System

50

50

GND

453

64

220

169

71.5

GND

Figure 7-2. Inverting Configuration (Gain = –7V/V)

+

±

75

453

2.5 V

í2.5 V

50-

Source

50

GND

GND

RS

50-

Measurement

System

50

50

GND

CL

GND

1 k

53.6

GND

Figure 7-3. Capacitive Load Driver Configuration

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OPA955

SLOSEE6 – JULY 2026

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