Patent ID: 6285250
Filing Date: 2001-09-04
Classification: G06J

Abstract:
A signal processing integrated circuit comprising:a) analog signal processing means for processing an analog signal;b) digital signal processing means connected to said analog signal processing means through a predetermined path and for processing a digital signal, said predetermined path extending between said analog signal processing means and said digital signal processing means, said analog signal processing means and said digital signal processing means each including transistors which are formed on a commonsubstrate of said integrated circuit;c) power supply wiring for receiving power source voltages and for directing received power source voltages to said analog signal processing means and to said digital signal processing means so that said power source voltages are separately supplied to said analog signal processing means transistors and to said digital signal processing means transistors; andd) preventing means connected in said predetermined path between said analog signal processing means and said digital signal processing means, for preventing abnormal current which is greater than a predetermined magnitude from following through said predetermined path at least upon the application of power source voltages to said power supply wiring.