An Ultra Low Noise Measurement Amplifier

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In a nutshell:

Voltage noise referred to input (measurement bandwidth = audio A-weighted)	=	< 300 pV SQRT/Hz (JFET = NXP BF862)
Bandwidth 									=	~ 0.1 Hz - ~ 1.5 MHz
Input impedance									=	  1.1 M ohm
Voltage gain (dB fixed)								=	  60 dB (output = single ended)
										=	  66 dB (output = balanced)

Design files and associated documents for download:

Schematic diagram in PDF format
PCB layout top overlay in PDF format
PCB Gerber files in ZIP format




Page under construction..........