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Stabilisation of multi-loop amplifiers using circuit-based two-port models stability analysis

Pasdar, A ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1049/cds2.12050
  3. Publisher: John Wiley and Sons Inc , 2021
  4. Abstract:
  5. This article applies a systematic approach based on the normalized determinant function (NDF) theory to analyse stability in multi-loop circuits and to design the required stabilization network. Presenting several provisions, the return ratios are extracted by employing immittance or hybrid matrices (Z, Y, G or H) of active two ports. Using these matrices, instead of the S-parameters, facilitates the selection of an appropriate stabilizer network. As a practical case, a non-uniform distributed amplifier (NDA) is designed and inspected for potential instabilities. The presented procedure detects instability associated with one of the NDA circuit's loops, and an appropriate stabilization circuit is accordingly devised. In order to validate the procedure, the designed NDA is implemented in a 0.1-μm GaAs pHEMT process. As predicted, the measurements show oscillations, once the on-chip stabilization circuit is disabled. © 2021 The Authors. IET Circuits, Devices & Systems published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology
  6. Keywords:
  7. Broadband amplifiers ; Circuit oscillations ; Electric network analysis ; Gallium arsenide ; III-V semiconductors ; Scattering parameters ; Timing circuits ; Distributed amplifier ; Gaas phemt process ; Hybrid matrix ; Potential instability ; Return ratio ; Stability analysis ; Stabilization networks ; Two-port models ; Stabilization
  8. Source: IET Circuits, Devices and Systems ; Volume 15, Issue 6 , 2021 , Pages 553-559 ; 1751858X (ISSN)
  9. URL: https://ietresearch.onlinelibrary.wiley.com/doi/full/10.1049/cds2.12050