graduate from southeast university with focus on circuits and systems. As an engineer of system test and manufacture of wireless communication products in eigencomm CO., LTD. In my career, i test more than 50 products and make them into mass production, including SOC modem system for mobile phone platform, short distance wireless data communication systems and long distance products. I usually use LTspice in my work to simulation power products, OPamp products. i like LTSpice.