Radio

• 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

• What does LO stand for? Local Oscillator
• http://www.microwaves101.com/encyclopedia/mixerwaveforms.cfm