Influence of the Feedback Filter on the Response of the Pulsed Digital Oscillator

TL;DR

This paper proposes a new double feedback topology for the Pulsed Digital Oscillator to improve performance and reduce damping loss dependence, supported by simulations and preliminary experiments.

Contribution

It introduces a novel double feedback topology for PDO, addressing damping loss issues inherent in the classical single feedback design.

Findings

Double feedback topology can enhance PDO performance.

Simulations and experiments show improved response in certain frequency ranges.

The new topology reduces sensitivity to damping losses.

Abstract

This paper introduces a new feedback topology for the Pulsed Digital Oscillator (PDO) and compares it to the classical topology. The `classic' or single feedback topology, introduced in previous works, shows a strong behavior dependence on the damping losses in the MEMS resonator. A new double feedback topology is introduced here in order to help solving this problem. Comparative discrete-time simulations and preliminary experimental measurements have been carried out for both topologies, showing how the new double feedback topology may increase PDO performance for some frequency ranges.