Ring oscillators and self-timed rings in true random number generators
In this chapter, we explain important role of ring oscillators in generating random bit streams in logic devices. We consider three types of ring oscillators used as sources of jittery clock signals: single-event ring oscillators, multi-event ring oscillators with collision and multi-event ring oscillator without collision, i.e. self-timed rings. We present some representative examples of oscillator-based true random number generators and their characteristics.
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