7 Parameter Measurement Information

The various test setup configurations for the OPA855-Q1 are shown in Figure 7-1, Figure 7-2, and Figure 7-3.

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

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

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

+

±

453

2.5 V

í2.5 V

50-

Source

50

GND

GND

50-

Measurement

System

50

50

GND

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 = –7 V/V)

+

±

75

453

2.5 V

í2.5 V

50-

Source

50

GND

GND

50-

Measurement

System

50

50

GND

GND

1 k

53.6

GND

Figure 7-3. Capacitive Load Driver Configuration

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OPA855-Q1

SBOSA57A – FEBRUARY 2021 – REVISED MARCH 2021

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Product Folder Links: OPA855-Q1