I tried to reduce this down to a manageable amount by lowpass filtering, but I did not find a filter with sufficient stopband attenuation so I could live with the remnants. It worked, but the output was infested with a few 10mV of ripple at a few 100kHz and substantial RF garbage from shortwave to beyond the VHF bands. The first try was a tiny, compact, commercial potted 5V/15V converter module.

That means that we need a voltage converter, a rectifier and filter on the output side, a regulator with feedback and some anti-RFI circuitry. The only question is how much effort needs to be spent for killing off all RF hassle on the analog output side. Still, even the Keysight U7227A 10MHz to 4GHz preamplifier uses it as a power source, so it must be possible to convert this into a clean analog power of ca. We may say, the load is more or less a constant resistor paralleled with a capacitor.Д«ut USB ? Really ? USB is a high-speed digital bus renowned for everything except plain and clean power. 50mA, but the load is very constant and does not have any spikes or pulse currents due to the very low level input signal level of this preamp (-30dBm max.). On the other side, the load requirements of the INA02186 preamp are very modest The input voltage should be ca. The only thing that could be used is a USB output on the DSA815 front panel (we may assume that a maximum current of ca.

If you look at the DSA815TG, there is no output that can be used for powering up probes or other devices like on a Keysight N9000A CXA or a E5071C VNA with their вЂњprobe powerвЂќ outlets on the front panel (they offer +15V and -12V at sufficient current rating for what we need).

how can you make sure that no RFI and noise coming from the power side are spoiling amplifier performance ?Д¬lick here to see a Noise Figure Measurement Solution for the Poor вЂ¦Д¬lick here to see an INA02186 MMIC Amplifier вЂ¦.

how would you power this amplifier so no external line power is necessary that would make it big and bulky ?.

The INA02186 I made came in very handy, except for one little issue: For my project вЂњA Noise Figure Measurement Solution for the PoorвЂќ using a RIGOL DSA815TG budget spectrum analyzer I needed an external preamplifer for testing.

Rigol dsa815 measuring conductive noise