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 |
4. Adiabatic dynamic logic (ADL) |
5. Clocked adiabatic logic (CAL) |
6. Improved clocked adiabatic logic |
7. Efficient charge recovery logic |
8. 2N-2N2P adiabatic logic |
9. Positive feedback adiabatic logic |
10. Charge recycling differential |
11. Half rail differential logic |
12. Pass transistor adiabatic logic |
13. Quasi static energy recovery |
14. NMOS energy recovery logic (NERL) |
15. Bootstrapped charge recovery |
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 |
ESF |
CAL with |
1.075 |
CAL with |
1.071 |
ECRL with |
2.570 |
2N-2N2P with |
1.008 |
Adiabatic Types |
Static power |
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 |