Phase Locked Loop For Radiation Hardened Environment

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Title: Phase Locked Loop For Radiation Hardened Environment
Author: Wu, Jer-Fu Dennis
Abstract: This thesis describes a Phase Locked Loop (PLL ) design for operation within a radiation environment . Specific design architecture and techniques were implemented to help mitigate radiation effects that degrade PLL performance . This thesis presents several elements of a rad -hard PLL that were developed to solve this challenge , such as a very wideband coupling coefficient LC VCO that has a much higher frequency tuning range than conventional varactor based LC VCOs . The PLL consists a Phase and Frequency Detector (PFD ) , a rail to rail charge pump , a loop filter , the quadrature LC tank Voltage Controlled Oscillator (VCO ) , a Current Mode Logic (CML ) frequency divider , a True Single -Phase Clocked (TSPC ) divider , and a Differential to Single -ended converter (D2S ) . The main radiation effects on MOSFETs include changes of threshold voltage and mobility , which causes the drain current to decrease . As a result , the phase noise and tuning range of PLL are degraded . The proposed radiation hard PLL uses the unique Peregrine Semiconductor Corp (PSC ) 0 .25um Silicon on Sapphire (SOS ) CMOS process technology . The center frequency is 3 .6 GHz , and the tuning range is from 2 .3 GHz to 5 .1 GHz . The minimum frequency tuning range is 70 % under pre -radiation and post -radiation conditions . Simulated power consumption is 124 .23 mW in pre -radiation and 145 .73 mW in post -radiation . Simulated pre -radiation phase noise is -130 dBc /Hz at 1 MHz offset , and post -radiation phase noise is -127 .9 dBc /Hz at 1MHz offset . The locking time is less than 450ns under post -radiation conditions . The overall focus is on a systematic design methodology for radiation -hardened PLL in a SOS CMOS process .
URI: http : / /hdl .handle .net /10106 /51
Date: 2007-08-23

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Phase Locked Loop For Radiation Hardened Environment. Available electronically from http : / /hdl .handle .net /10106 /51 .

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