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Transcript
Low Power FM Receiver Andrew Young November 17, 2008 Overview Project Inspiration Requirements Differences Design Block Diagram Design Schematic Operational Flowchart LCD Layout Questions 2 Inspiration 2008 IEEE Student Contest ◦ Objective: Create low power FM radio receiver ◦ Can use commercially-available IC subsystems Senior Design Project ◦ Competition between two teams ◦ Goal is lowest power consumption 3 Design Requirements Receive FM radio from 88.1 to 107.9 MHz Output audio at > 4mW per channel to standard 32-Ohm headphones (33-Ohm resistors used for testing) Adjustable volume/station Interact with user via LCD interface Entire design implemented on one PCB Competition Testing: One supply source, < 15V DC Design allows for internal circuit inspection Optional Extras: Display RDS data (station name, artist, song title) Any extra features (signal strength, station presets, menu) My own customization – video games, easter eggs, etc. Differences What is different about this design compared to the senior design project? ◦ Extra features – Something cool to add which takes advantage of already-existing components, such as the attached LCD and joystick (video game, perhaps?). Design Block Diagram Headphone Amplifier FM Receiver IC (Si4703) Microcontroller (ATMega32) LCD/User Interface 104.1 6 Schematic - Page 1 Push Buttons Port A LCD Port B FM Receiver Si4703 Comm ATMega32 Battery Output Switching Power Supply Audio L/R Voltage Adjustment Schematic - Page 2 On/Off Switch Clock Generator Audio L/R Batteries (2x AA) Headphone Jack Gain Adjustment Potentiometers Noise Suppression Input Coupling Low Voltage Input Audio Amplifier ESD Protection AVR Application Development Codevision AVR IDE (Evaluation) ◦ Limited to 2kB code size ◦ Built-in libraries (LCD, I2C, Power-Save) AVR Studio 4.0 ◦ Used to debug and set clock rates, voltage levels, fuses Operational Flowchart Power on Interrupt When Button Pressed AVR Initializes Receiver & LCD Determine Button Pressed (Volume Up or Down, Tune Up or Down) Set to Default Station & Volume Receive RDS Data Idle Send Appropriate Signal to IC to Change Volume/Station Receive Signal Strength Send Appropriate Signal to Receive Current Volume/Station Output Signal & RDS to LCD Translate Data to LCD Output Interrupt Return from Interrupt 10 LCD Layout 104.1 - KZRZ Artist – Song Name Sig. █ █ █ █ Vol. █ █ █ █ █ █ █ █ █ 11 Summary Designing Low-Power FM Radio Receiver w/ Inspiration: Senior Design Competition Extras: Features not required by the senior design project, such as a video game using the 4x20 LCD and the attached joystick. 12 Questions 13 ATMega32 AVR Silicon Labs Si4703 Headphone Amplifier – MAX9725