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  • Frequency Modulation (FM) Tutorial
    Edwin H. Armstrong, known as one of the founding fathers of radio technology, invented the superheterodyne radio receiver in 1918 and frequency modulation (FM) in 1933 [1]. These two concepts, along with his regenerative circuit technique developed in 1912, formed the basis of radio frequency
  • USB FM Radio
    This USB FM Radio design is intended as a reference for incorporating FM radio functionality into a USB product. The design consists of two major components, the Si4701 FM radio receiver and the C8051F321 microcontroller with a built-in universal serial bus (USB) peripheral. Due to the high level
  • Broadcast FM Radio Tuner for Portable Applications
    This document applies to Si4702/03-C Firmware 19 and greater. Worldwide FM band support (76-108 MHz). Digital low-IF receiver. Frequency synthesizer with integrated VCO. Seek tuning. Automatic frequency control (AFC). Automatic gain control (AGC). Excellent overload immunity. Signal strength
  • Solving FM Antenna Design Challenges in Portable Devices (.pdf)
    a description of an FM radio receiver solution that enables the antenna to be integrated or embedded inside the portable device enclosure, making the headphone cable optional. This white paper covers techniques for maximizing sensitivity, including maximizing efficiency at the resonant frequency and maximizing
  • SMR-4820 Compact Microwave Search Receiver
    The SMR-4820 Microwave Receiver is a high-performance receiver designed for covert and clandestine type signals intelligence (SIGINT) operations requiring smaller-size equipment. RF preselection is accomplished with switched bandpass filters. The SMR-4820 design is optimized for reception
  • Design Considerations for High-End Consumer and Pro-Audio Equipment
    Designing high-end consumer and professional audio equipment requires considerable audio application expertise and state-of-the art components. To achieve the highest possible performance, some audio designers rely on discrete components to create their AM/FM receiver designs. However

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