A Radiation-Hard Non-linear DAC for DDFS
نویسنده
چکیده
A radiation-hardened 12-bit non-linear DAC was designed and fabricated on Honeywell’s 0.35 μm MOI5 SOI CMOS process. The non-linear DAC allows a significant reduction in complexity and power dissipation when used within direct digital frequency synthesizers (DDFSs). The non-linear DAC implements a 32-segement piecewise linear approximation to sine function reducing the ROM look-up table size from 11K bits to 544 bits. Test results show that an SFDR of 72 dBc is achieved at low output frequency and 54 dBc at high frequency. Radiation test shows that the non-linear DAC can sustain a total ionizing dose up to 200 Krad Si. KeywordsDDFS; non-linear DAC; piecewise-linear approximation; radiation hardness
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