access icon free Fault-tolerant delay cell for ring oscillator application in 65 nm CMOS technology

A novel fault tolerant delay cell for ring oscillator (RO) is proposed. As RO is one of the crucial blocks in phased locked loop, delayed locked loo and clock data recovery, it should be tolerated against single event transient (SET) and stuck at faults for harsh environment. Their proposed hybrid fault tolerant topology is combination of triple and quad transistors redundancy, which is applied to the delay cell structure based on the sensitivity role of each transistor. The simulation results with Cadence software show that the proposed fault-tolerant delay cell dissipates 34.34 µW power, while it occupies 127.2 µm2 chip area. The proposed topology not only has lower power dissipation in comparison with existing fault tolerant delay cells but also is more reliable against stuck at single and multiple faults and also SETs. By using the proposed reliable delay cell in the RO, the achieved power dissipation and phase noise are about 249 µW and −96 dBc/Hz, respectively, while higher reliability is achieved in comparison with non-redundant RO s.

Inspec keywords: phase locked loops; oscillators; MOSFET; clock and data recovery circuits; CMOS analogue integrated circuits; delay lock loops; fault tolerance; integrated circuit reliability; radiation hardening (electronics)

Other keywords: triple transistor redundancy; phased locked loop; Cadence software; clock data recovery; size 65 nm; fault-tolerant delay celltopology; single event transient; ring oscillator application; CMOS technology; SET; RO; quadtransistor redundancy; power 34.34 muW; phase noise; reliability; delayed locked loop; power dissipation

Subjects: Modulators, demodulators, discriminators and mixers; Other analogue circuits; CMOS integrated circuits; Radiation effects (semiconductor technology); Oscillators; Reliability; Insulated gate field effect transistors; Other digital circuits

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-cds.2017.0380
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content/journals/10.1049/iet-cds.2017.0380
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