An FM radio receiver solution
Release Time:
2024-06-13
Frequency modulation (FM) radios have been used for many years in hi-fi music and voice broadcasting, providing excellent sound quality, signal robustness, and noise immunity. Recently, FM radio has started to be used more and more in mobile and personal media players. However, traditional FM design methods require long antennas, such as wired headphones, limiting many users who do not have wired headphones. In addition, with the increasing popularity of wireless usage models in portable devices, more users can benefit from wireless FM radios that use other types of FM antennas, while also using wireless headphones or speakers to listen to sound.
In this article, we'll look at an FM radio receiver solution that integrates or embeds an antenna inside a portable device, making a headphone cable optional. We will start with maximizing the receive sensitivity, and then introduce the methods to achieve the maximum sensitivity, including maximizing the efficiency of the resonant frequency, maximizing the antenna size, and maximizing the efficiency across the entire FM bandwidth using a tunable matching network. Finally, this paper will also give the implementation method of the tunable matching network.
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