Forward Body Biased Multimode Multi-Threshold CMOS Technique for Ground Bounce Noise Reduction in Static CMOS Adders
Keywords:
Forward body bias, ground bounce noise, leakage current, sleep to active mode transition.Abstract
As technology is continuously scaling down
leakage current is increasing exponentially. Multi-Threshold
CMOS technique is a well known way to reduce leakage
current but it gives rise to a new problem i.e. ground bounce
noise which reduces the reliability of the circuit and because of
this circuit may incorrectly switch to the wrong value or may
switch at the wrong time. Ground bouncing noise produced
during sleep to active mode transitions is an important
challenge in Multi-Threshold CMOS (MTCMOS) circuits. The
effectiveness of noise-aware forward body biased multimode
MTCMOS circuit techniques to deal with the ground bouncing
noise is evaluated in this paper. An additional wait mode is
investigated to gradually dump the charge stored on the virtual
ground line to the real ground distribution network during the
sleep to active mode transitions. The peak amplitude of the
ground bouncing noise is reduced by 93.28% and standby
leakage current is reduced by 23.94% as compared to standard
trimode MTCMOS technique.
To evaluate the significance of the proposed multimode
Multi-Threshold CMOS technique, the simulation has been
performed for 16-bit full adder circuit using BPTM 90nm
standard CMOS technology at room temperature with supply
voltage of 1V .
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