STABILITY ANALYSIS OF OSCILLATORS BASED ON A DELTA–SIGMA TOPOLOGY

• Abstract:

  The growing demand of mixed–signal integrated circuits encourages the research of Built-In Self-Test (BIST) techniques to achieve simpler and less expensive testing processes. High quality sinusoidal oscillators based on a Δ-Σ topology are an effective solution to perform the test of this kind of devices. Unfortunately, due to the in–loop 1–bit quantizer nonlinearity, several problems of stability have been observed. A stability analysis on the behavior of the oscillator based on a second order Δ-Σ modulator presented in [1] is described in this paper. In particular, it is shown that the oscillator is intrinsically unstable and its complete dynamics is very difficult to predict exactly. Finally, a possible stabilization strategy is proposed.
• Keywords:

  BIST, oscillator, delta–sigma
• Download:

  IMEKO-TC4-2002-047.pdf
• DOI:

  _unreg_tc4-2002.047

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