Ultra low-noise Preamplifier

Preamplifier AFT400

Designed for precision signal conditioning in demanding measurement environments, this low-noise preamplifier delivers outstanding performance across a wide bandwidth and gain range. Featuring input-referred noise as low as 1 nV/√Hz, high common-mode rejection ratio (CMRR), and selectable AC/DC coupling, it is ideally suited for weak-signal detection, sensor readout, and advanced laboratory instrumentation. Robust, compact, and engineered for long-term reliability, it is a versatile tool for both research and industrial applications.

Core Features

• Selectable gain: x1, x10, x100, x1000
• Input coupling: DC or AC switchable
• Bandwidth limit upto 100 Hz
• Output offset control
• Remote control interface (optional): Optical fibre

Signal Input

• Connector type: Isolated BNC
• Input modes: Single Ended and Differential
• Input impedance (DC coupled): 1 MΩ
• Input capacitance (gain x1 & x10, < 100 kHz): 39 pF
• Common-mode input range (DC coupled): −10 V to +10 V
• Maximum input voltage: ±10 V_peak (AC coupled), ±12 V (DC coupled)

Gain and Bandwidth

• Filter BW (−3 dB): 100 Hz, 1 kHz, 10 kHz, 100 kHz, 1 MHz
• Filter type: 2^nd order
• Amplitude accuracy (@10 Hz): < 1%
• Harmonic distortion (@ 1 kHz, 0.2 V_rms): < 10 µV (3^rd harmonic)

Performance