Distributed Oscillators

Distributed Oscillators

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As the operating frequency is increased, oscillator phase noise performance degrades. Oscillators with improved phase noise require higher loaded Q. Higher loaded Q requires higher unloaded Q, and for L-C oscillators, this means increased inductor physical size. There is an upper limit on inductor size before distributed self-capacitance and stray capacitance to ground become a problem. A potential solution to this problem is to use distributed (transmission line) resonators which may be larger and therefore have higher unloaded Q than inductors.

Chapter Contents:

  • 9.1 Negative Resistance UHF Oscillator
  • 9.1.1 Circuit Vagaries
  • 9.1.2 L-C Resonator Form
  • 9.1.3 Output Coupling
  • 9.1.4 Advantages
  • 9.1.5 Circuit Variations
  • 9.2 Negative-R Oscillator with Transformer
  • 9.3 Bipolar Cavity Oscillator
  • 9.3.1 Tuning
  • 9.3.2 Example
  • 9.4 Hybrid Cavity Oscillator
  • 9.5 References

Inspec keywords: phase noise; oscillators; resonators; inductors; LC circuits

Other keywords: distributed resonator; higher loaded Q; inductor physical size; stray capacitance distribution; L-C oscillator; distributed oscillator; self-capacitance distribution; transmission line; phase noise

Subjects: Inductors and transformers; Oscillators; Waveguide and microwave transmission line components

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