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Low noise negative votage

I have an RF application (SSPA GaAs gate voltage and negative op amp rail) that requires a low current (few mA) low noise negative voltage of -5V.  The input voltages available are +8.7V, +5.3V and +3.7V.  For the positive voltage rails I have utilized a buck converter followed by a 60dB PSRR LDO.  Can you recommend a low noise configuration to generate a -5V rail?

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