Analog set-up for non linear dielectric measurements up to 100 kHz

In this paper, we present a new analog set-up for non linear dielectric measurements. The device is based on the auto-balanced bridge principle used in impedance analyzers. Its main advantage is to operate at high frequencies in comparison with a classical current amplifier. This extension consists in extracting the harmonics of a non sinusoidal current crossing the material. The set-up is used to perform non linear dielectric measurements on a ferroelectric liquid crystal and shows better performances than a previously published digital set-up.