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Why is it that you need 12dB? Most of our parts are 6dB for impedance matching.
If you can afford to lose 23% of your output swing, you could use the OPA361 with a 97.6Ω/324Ω output resistor divider for a 75Ω, 12dB amplifier Thevinin equivalent. Otherwise you can cascade two 6dB amplifiers.