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Low Power Techniques in VLSI

PHYSICSPosted by SANJAY SHARMA Mon, January 11, 2016 15:12:32
Certain class of logic circuits called adiabatic logic deals the probability of further decreasing the energy dissipated during the switching activity, and the possibility of reusing or recycling, some amount of the energy drawn from the power supply. To undertake this goal, the circuit topology and the operation principles should have to be modified, sometimes significantly. The amount of energy recycling achievable using adiabatic techniques is also determined by the fabrication technology, the voltage swing and switching speed.

List of adiabatic logic families in approximate chronological order

1. Recovered energy logic (REL)

2. Charge recovery logic (CRL)

3. Split level charge recovery logic (SCRL)

4. Adiabatic dynamic logic (ADL)

5. Clocked adiabatic logic (CAL)

6. Improved clocked adiabatic logic (ICAL)

7. Efficient charge recovery logic (ECRL)

8. 2N-2N2P adiabatic logic

9. Positive feedback adiabatic logic (PFAL)

10. Charge recycling differential logic (CRDL)

11. Half rail differential logic (HRDL)

12. Pass transistor adiabatic logic (PAL)

13. Quasi static energy recovery logic (QSERL)

14. NMOS energy recovery logic (NERL)

15. Bootstrapped charge recovery logic (BCRL)

16. High efficient energy recovery logic (HERL)


Out of these, there are four families such as ECRL, 2N-2N2P, CAL and ICAL that gives a clarification for the goodness of such circuts in terms of Energy Saving Factors, Static Power Dissipation and Delay: (Under 180 nm Technogy)

Adiabatic type

ESF

CAL with ICAL

1.075

CAL with 2N-2N2P

1.071

ECRL with CAL

2.570

2N-2N2P with ICAL

1.008

Adiabatic Types

Static power Dissipation

CAL

49.08 pW

ICAL

2.4 µW

2N-2N2P

32.2 pW

ECRL

33.0 µW

Voltage (V)

CAL XOR (ns)

ICAL XOR (ns)

2N-2N2P XOR (ns)

0.9

0.69

0.15

1.95

1.0

0.65

0.62

1.83

1.2

0.61

0.58

1.72

1.3

0.59

0.57

1.69



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