Le, Khanh, Tu Bui, Hung Le, and Kha Pham. “A Design of Low Voltage OPAMP Using Split-Length Transistors”. VNUHCM Journal of Science and Technology Development 17, no. 1 (March 31, 2014): 62-70. Accessed September 1, 2025. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/1243.