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A Loss of Reference Clock Detect Circuit

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4 Author(s)
Jian Lv ; Sch. of Opto-Electron. Inf., Univ. of Electron. Sci. & Technol. of China, Chengdu ; Jiang, Yadong ; Donglu Zhang ; Liu, J.

Loss of reference clock may harm the functionality of system on chips (SoCs) permanently or intermittently. In this paper, we propose a novel circuit based on an XOR phase detector and a simple charge pump to monitor the input reference clock continuously. This circuit can provide a signal to indicate the loss of reference clock. SPICE simulation results confirm that the proposed reference clock detect circuit can monitor the input reference clock and provide a correct indication signal.

Published in:

Testing and Diagnosis, 2009. ICTD 2009. IEEE Circuits and Systems International Conference on

Date of Conference:

28-29 April 2009