A low-cost quadrature decoder/counter interface integrated circuit for AC induction motor server control

An AC motor server control IC which performs the quadrature decoder, counte r, and bus interface function is presented in this paper. This interface IC employing TSMC 0.6 mu m SPTM technology has been fabricated and tested and the results indicate that its function fully works. A novel noise filter l ogic is included in the design which allows reliable operations in noisy en vironments. It also contains a quadrature decoder such that the phase lag o f an external clock and the input signal can be determined.