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Abstract
High Frequency Electronic Circuit Design is the second "Communication Circuits " after the
theoretical study and experimental teaching another important practical teaching. Its mission is to
master and have the students basic knowledge of electronics circuit design and unit capabilities,
to enable students to make comprehensive use of high frequency electronic circuit knowledge,
the actual high-frequency system design,installation and debug, using software such as the
circuit multisim Design, improve the comprehensive ability to apply knowledge, problem
solving abilities and practical skills in electronics to enable students to understand the
high-frequency electronic communications technology in the field of industrial application and
development trends.In the field of electronic technology for the future of engineering design in
future.
FM receiver is used to receive radio broadcasts, which the radio frequency detector isthe
high-frequency signals on the FM demodulation. FM signal amplitude could have been so. But
in the process of transmission, due to various disturbances, so thatmagnitude have ups and
downs. To eliminate the interference, the discriminator before the limiter used to limit, the
amplitude modulation signal restored to the state.
According to the principle of superheterodyne FM radio, we can whole circuit is divided
into the following modules: input tuning circuit, high frequency amplifier, mixer circuit, local
oscillator, IF amplifier, frequency discriminator circuit, low frequency Amplifiercircuit.
Keywords: FM discriminator mixer