I have an initial accurate voltage reference, which I need to buffer. So I feed it to an opamp, which then drives a final output power transistor for a high current final voltage reference. Of course, if I want a reliable final voltage reference, keeping the noise down is imperative.
The noise from the initial voltage reference & opamp are already low. My concern now is the noise from the power transistor. Which would be typically low noise, a power MOSFET or a power BJT (Darlington)? The datasheets of the MOSFET & BJT I already bought does not mention noise levels.
Also, I didn't mention here because of website product policy that the power transistors in question are FDD770N15A & 2SD2560.