SBOSA57A February 2021 – March 2021 OPA855-Q1
The various test setup configurations for the OPA855-Q1 are shown in Figure 7-1, Figure 7-2, and Figure 7-3. When configuring the OPA855-Q1 in a gain of +39.2 V/V, feedback resistor RF was set to 953 Ω.
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.