Abstract:

A non-contact testing method for digital circuit is provided to extend probe’s lifetime and increase reliability in automatic testing system (ATS). The near field radiation of circuit nodes is detected via a flat antenna and a charge amplifier, and the original digital signal is reconstructed by the edge-discriminate method. This paper focuses on the issue of antenna’s model, crosstalk between nodes and thresholds selection,and the hardware implementation is also proposed. The validity and performance of the method are verified.