EE3333 Group 3 Replacement System

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EE3333 - Group 3Replacement System

• Advisor Dr. Karp
• Bryan Hughes
• Gabriel Vega
• Najib Nawas
• David Belt

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Agenda
1. DDS
2. Amplifiers
3. Receiver
4. Budget / Gantt Chart
4. Sources
3
DDSSetup
Note DDS must be reset before it can be written
to for some reason. This is not in the data sheet.
Bryan Hughes
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DDSClock Output

• A reference multiplier of 13 is issued to Control
  Function Register 2
• 13x30MHz 390MHz
• The SYNC_CLK pin (shown) is ¼ of the master
  clock
• 30MHz/4 7.5MHz (default clock)
• 390MHz/4 97.5MHz (updated clock)

Bryan Hughes
5
DDSSignal Output DC coupled
AVDD
IOUT
The output is reference to AVDD and should have a
center to peak voltage of 0.5V Obviously the
signal is absent.
Bryan Hughes
6
DDSSignal Output AC coupled
AVDD
IOUT
This signal is AC coupled and highly zoomed in.
This is just noise.
Bryan Hughes
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Amplifier Results
David Belt
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Amplifier Options

• Current Model
• ERA-5SM
• Filter -gt Amplifier
• Pout lt90mW

• Options
• Class C Power Amplifier
• Filter -gt Class C
• Option 2
• Era-5SM -gtfilter -gt class C

David Belt
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AD608 down-converting mixer
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AD608 results
Source Group 1
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455KHz output
PNP BJT amplifier as recommended by the Data
sheet. 2N3906
Amplitude of 300mV P
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Post amplification results
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Filter design
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Spectrum of filter
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Filter parasitic analysis
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Results of parasitic analysis
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Quadrature Detector
1.9V
1 455 KHz
2pv24.6uH5nF
1 1.6 KHz
2p8.2KO12nF
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Audio Output

• Input Required
• 0 dBm
• 380 mV difference
• DC Offset 1.88V

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FSK Output

• 2400 Baud
• 4.8 KHz Frequency Deviation
• With current settings
• 455 KHz 4.8V
• 459.8 KHz 1.6V

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Budget
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Gantt Chart
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Sources

• MSP430 Manual
• AD9859 Manual
• psk31beacon.c source by Michael Gray (DDS code
  from online)

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Questions?