The purpose of a communication system is to transmit an information-bearing message signal through a channel that separates a transmitter from a receiver. The modulated carrier is often induced and interfered with by various noise sources. The co-channel separation system is a demodulation process function that operates at the same carrier modulation system. Here, we adopted the field-programmable gate array (FPGA) design platform configuration to develop, implement and achieve co-channel separation for an amplitude-locked loop demodulation chip-design digital system with additive white Gaussian noise interference. In this paper, the compact reconfigurable I/O built-in FPGA chip system is integrated and applied to obtain the cross-field relevant integration function for communication and chip-design system via programming in a graphical language. Additionally, the FPGA chip-design system runs all of the program code in hardware and provides high reliability and determinism. This cross-field ideal is adopted to save time and reduce complexity in the design development of a custom circuitry system. The FPGA chip-design system described in this paper is also used to achieve a digital communication chip prototype design model, followed by presentation of the steps necessary for building and program verification. The communication and chip-design concept may provide very useful physical applications for the industry.