Summary of Transient Current Data for S/N 42, XQVR300, as a Function of Total Dose
Dose
krad (Si)Curve Caption 0 Voltage and current measurement for SN #42 before irradiation. The measurement is taken with oscilloscope during power-up with the 2 ms-ramp. The current peak observed during the ramp-up of the voltage is according to specification. 24 Voltage and current measurement for SN #42 after the 1st irradiation step (25 krad). The measurement is taken with oscilloscope during power-up with the 2 ms-ramp. The current peak has decreased from the pre-irradiation measurement. 45
Voltage and current measurement for SN #42 after the 2nd irradiation (45 krad). The measurements are taken with oscilloscope during power-with the 2 ms-ramp (A) and the 4 ms-ramp (B). The over current protection circuit turns off the power (A). By increasing the rise time the device used less current in the power-up phase and the power-up succeeded. The over current protection circuit for SN #41 is slightly than for SN #41. When reaching the maximum current (2.5 A) it takes microseconds before the power is turned off. [Note, the 4 ms ramp uses a capacitor to slow the power supply's transition time.] 75 Voltage and current measurement for SN #42 after the 3rd irradiation step (75 krad). The measurement is taken with oscilloscope during power-up with the 4 ms-ramp. Both with the 2 ms- and 4 ms ramp the power-up failed. The over current protection circuit for SN #42 is slightly slower than for SN #41. When reaching the maximum current (2.5 A) it takes some microseconds before the power is turned off. [Note, the 4 ms ramp uses a capacitor to slow the power supply's transition time.] 95 Voltage and current measurement for SN #42 after the last irradiation step (95 krad). The measurement is taken with oscilloscope during power-up with the 2 ms-ramp. Both with the 2 ms- and 4 ms ramp the power-up failed. The over current protection circuit for SN #42 is slightly slower than for SN #41. When reaching the maximum current (2.5 A) it takes some microseconds before the power is turned off.
From - "Radiation Evaluation of Power-up Behaviour of Xilinx FPGA XQVR300," January, 21, 2002. Document No D-P-REP-1092-SE esa_qca0112t_c.pdf
Home
Last Revised: May 20, 2002
Digital Engineering Institute
Web Grunt: Richard Katz
