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A precise fiber-based time and frequency dissemination scheme for multiple users with a tree-like branching topology is proposed. Through this scheme, ultrastable signals can be easily accessed online without affecting other sites. The scheme is tested through an experiment, in which a modulated frequency signal and a synchronized time signal are transferred to multiple remote sites over delay-stabilized...
A new type of low power decoding circuit for asynchronous sigma delta modulators is presented. The circuit implements a special coarse-fine time-to-digital converter to quantize the square wave produced by asynchronous sigma delta modulators, and converts the duty cycle to a digital output. The time-to-digital converter operates asynchronously by utilizing vernier delay lines. The purpose of this...
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