Chen_GlitchPower - ELEC 6970 Low power design Project...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
ELEC 6970 Low power design Project Report Yijing Chen Insert delays to eliminate glitches 1. Introduce array multiplier : The array multiplier offers lower speed but consume smaller areas than Wallace-tree multiplier. As shown array multiplier in Fig. 1, multiplicand bits are simultaneously input to all the partial product generators at every stage. All full adders start computing at the same time without waiting for the propagation of sum and carry signals from the previous stage. The outputs of the multiplier have many glitches. As for the power dissipation, the signal transition activity directly influences the dynamic power dissipation. This results in spurious transitions at the output and wastes power. Furthermore, as shown in Fig. 2, since these spurious transitions are propagated to the next stage continuously, their numbers grow stage by stage like a snow ball. This causes a significant increase in power dissipation. 0 0 0 0 0 0 0 0 A0 A1 A2 A3 B3 B2 B1 B0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Full adder B A Carry in Sum output Sum input Carry out Array Cell Figure 1. Traditional 4x4 multiplier Figure 2. spurious transition in multiplier
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2. Delay balancing array multiplier To solve the glitch problem, for simplicity, we assume a unit delay model where the delay through each multiplier cell from the sum or carry input to the sum or carry output is one. The input signals of the multiplier arrive simultaneously. After one delay unit, the output of all
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern