This amplifier has (@4MHz 300Kelvin) an very low input voltage noise, equivalent to the thermal noise of a 5 ohm resistor
The ac-gain is 100V/V (in 50 ohm load) from 20kHz to 40MHz.
Input resistance is 10k, input capacitance is 25pF. Output resistance is 50 ohm.
The design is based on a discrete HEMT-input stage, care should be taken not to damage the input by overloading it (0.5Vpp maximum).
The amplifier contains no chopper or oscillating circuits that could produce interference
output noise spectrum showing 26nV/sqrtHz @ 4MHz
(note that the analyser does not display "nV" it shows millimicrovolts instead)
measured equivalent input noise: (at roomtemperature)
4nV @20kHz
2nV @100kHz
0.5nV @1MHz
0.3nV @2MHz
0.26nV @4MHz
0.23nV @8MHz
0.4nV @40MHz