.2 Fsk Demodulator Front-end Design

FSK is a type of modulation technology that has been proposed long time ago. It is still playing an important role in the modern communication, since it posses the following three advantages: simple structure, robust anti-noise performance and high performance against attenuation. In this article, based on the requirements of a special project, the author designed a demodulator of 2FSK.Firstly, the author discusses the principle of 2FSK and its implementing method, then, based on the analysis of the receiving frequency, signal bandwidth, least receiving signal power, Bit Error Rate and the product cost, an appropriate design schedule was proposed to meet the task requirements. In the fourth chapter the author completes the particular circuit design and circuit emulation. In the fifth chapter the author tests the demodulator of 2FSK in the laboratory. It was demonstrated by the experimental results that the design of demodulator is feasible and meets the project's requirements.