Radio

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  • BPF
  • LPF+HPF=BPF
  • What frequency range?
  • How to implement? RL? RC? Do I need something more?
  • Amplifier
  • Do we need an amplifier? Is the incoming signal large enough?
  • LPF:
  • What frequency range?
  • How to implement?
  • Oscillator:
  • Outputs a logic high and logic low. What is the best way to convert this to a co/sine wave (multiplex?)
  • What value are we looking for?
  • Frequency Range:
  • FM is most likely too high to create
  • AM radio (car stereo) is about right. Find a station you want to tune to. KFBK 1530?
  • AM is allowed +- 5kHz
  • 96kHz of bandwidth (due to what the audio card can sample)
  • SI570 can create a number of frequencies


  • Notes to organize:
  • Switching Regulator
  • SI570, KN9YIG
  • Johnson counter
  • Jumper selectable band pass filter?
  • http://www.sdr-kits.net/USB/USB_Description.html
  • Softrock is taking up about 40mA, USB provides 100mA for USB2, and up to 500mA for a high-powered USB 2.0 bus.
  • Pick a logic family and stick with it: CMOS?
  • Book questions
  • Example 9.12, work through the math please
  • Can oscillators produce sine waves without needing a square wave? Do we need to have potentiometers instead of resistors to make sine waves not clip?
  • Class note questions