Analog testing using real zero crossing technique

The functional digital testing is defined as a black and white test [N. Nagi, et al., June 1998, B. Vinnakota, 1998] by other word, it can determine faulty and non faulty boards. But the analog faults are not. The faulty and non-faulty are relatively defined depending on tolerance allowed for non-faulty boards. In this paper, we introduce a new universal method based on zero crossing technique to evaluate the faulty circuits. The effect of tolerance form 0 to /spl plusmn/20% in frequency and amplitude has been formulated. The simulation has been done by MATLAB. The results indicate the simplicity of the proposed method.