Future Directions: Synthesizers

• Direct: A 1 GHz single- chip GaAs DDS

• Indirect: An InP FSP

• Hybrid: A digital “step-recovery diode”

  • Eliminates manually tuned RF diodes
  • Bandpass filters select desired harmonics
  • Simulated (1µm GaAs): 3Vpp pulse, 40 psec width, first sinc2 null at 25 GHz

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