412 / 2019-02-25 15:33:28

Design of a high precision delay locked loop for the readout chip of cosmic ray muon detector

muon readout chip, delay locked loop, phase detector, charge pump, delay unit

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A high precision delay locked loop (DLL) is designed for the readout circuit chip of a multi-channel cosmic ray muon detector in this paper. In order to decrease the system clock frequency and increase the measurement accuracy of muon signal, the DLL-based readout circuit architecture is preferred. The designed DLL has the features of wide dynamic clock range, the high stability and the high precision. It is designed and implemented by a TSMC 0.18um mixed-signal CMOS process. The simulation results show that, the locking time of the DLL is 7 us, the locked frequency range is 30～60 MHz, and the statistical error of jitter is less than 150 ps. The performances of designed DLL are satisfied with the requirements of the readout circuit chip for a multi-channel cosmic ray muon detector.