An electrically modulated sensor based on the converse magnetoelectric effect is studied in terms of noise, sensitivity and limit of detection (LOD). A 2x25 mm cantilever is electrically excited via a piezoelectric aluminium-nitride layer to the so-called U-mode, which has a resonance frequency of about 500 kHz. The U-mode proved very effective in modifying the anisotropy of the sensing magnetostrictive layer. The resulting carrier signal can be inductively read out with a pick-up coil. External magnetic fields will lead to an amplitude modulation of the signal, which can be resolved using FFT. Recently, a study was conducted investigating the influence of the substrate thickness on resonance frequency, Q-factor, sensitivity, noise and LOD of the sensor system.