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Impedance Based Stability Margin Assessment Supports Analog, Power and Mixed Signal Applications

Steve Sandler (Founder,

Location: Great America 2

Date: Wednesday, January 30

Time: 11:05am - 11:45am

Track: Sponsored Sessions

Session Type: Sponsored Session

Vault Recording: TBD

Rohde & Schwarz

Many modern circuits do not support traditional Bode plot stability assessment. In some cases, such as LDO voltage regulators and voltage references, the loop access is not available for measurement. In other cases, such as ADC and front-end LNA’s, the circuit bandwidth is much too allow breaking the loop for signal injection. A simple VNA measurement transformation offers a method of determining stability over the full range of the VNA, from Hz to 10’s of GHz.

Session highlights

  • Why assessing stability is essential
  • The limitations of the traditional Bode plot method
  • The proven Minor Loop stability method
  • Reducing it to a single, non-invasive measurement
  • Demonstrations with the ZNx VNA