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Question: Show realization of MOSFET based on Bit Shift Register
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Subject :- VLSI Design

Topic :- MOS Circuit Design Styles

Difficulty :- Medium

cmos(48) • 357 views
 modified 5 months ago by Sanket Shingote ♦♦ 220 written 7 months ago by awari.swati831 • 140
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The Shift registers are normally having group of flip-flops. Flip-flop is a 1 bit memory cell. In shift register the flip-flops are controlled by the clock. The number of flip-flops in shift register represent the number of bits used in it. When clock pulse is high data bit is enter into the first flip-flop in the shift register and the data is shifted to the other flip-flop during each clock pulse. The shifting is done by two ways, one is serial shifting and another one is parallel shifting. The following fig.1 shows the master slave flip-flop and based shift register.

The following fig.2 represents the one of the flip- flop model namely Power PC Style(PPCFF). It is fastest and high quality structure and have a short direct path and low power clock load.

Registers Numbers of gate used Delay(ns) Power ($\mu$ W) Power delay product(J) ($*e^{-15}$)
SISO 8 0.338 2.221 0.7506
SIPO 12 0.38(Q1), 20.38(Q2), 40.38(Q3), 60.34(Q4) 2.221 0.8439, 45.2339, 89.6839, 134.015
PISO 12 0.340 3.1 1.054
PIPO 8 0.338(Q1), 0.338(Q2), 0.338(Q3), 0.338(Q4) 2.91 0.9835, 0.9835, 0.9835, 0.9835