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The strongest ASIC power reductions usually come from matching a technique to the source of power: use voltage and clock controls to reduce switching, and power gating or higher-threshold cells to reduce leakage. At RTL, synthesis, and physical design, also limit unnecessary activity, capacitance, and data movement. There is no universally best method: savings depend on the workload, timing target, process, and implementation.
Start by identifying which power you need to reduce
Dynamic power is commonly expressed as Pdyn = CL × Vdd2 × α × f, where CL is load capacitance, Vdd is supply voltage, α is switching activity, and f is frequency. This explains why lowering voltage can be especially effective, while reducing switching or capacitance also cuts dynamic power.
Static power is approximately Pstatic ≈ Ileakage × Vdd. Leakage-focused techniques therefore address a different part of the problem than clock gating or activity reduction. In its 2026 review, Marina Papadopoulou, Michael Dossis, and Evangelos Karvounis identify switching power as the dominant dynamic component; the balance between dynamic and static power still depends on the design and operating conditions.
How the 10 methods differ
| Method | Primary power opportunity | Main design consideration |
|---|---|---|
| Supply-voltage scaling | Dynamic | Timing margin and voltage-domain support |
| Clock gating | Dynamic | Safe clock control, testability, and clock-tree effects |
| Power gating | Leakage | Wake-up, state handling, and power delivery |
| Multi-Vth assignment | Leakage | Timing slack and library characterization |
| Multiple supply-voltage domains | Dynamic | Domain crossings and level-shifter overhead |
| Operand isolation | Dynamic | Isolation-control cost and timing |
| Gate and transistor sizing | Dynamic and leakage | Balancing capacitance, slew, and path delay |
| Low-power logic synthesis and activity minimization | Dynamic | Realistic activity estimation |
| Scheduling, binding, and resource sharing | Dynamic and leakage | Workload behavior and resource idle time |
| Memory, interconnect, and data-movement reduction | Dynamic and leakage | Data reuse, communication, and implementation costs |
Ten methods to reduce ASIC power
1. Scale the supply voltage
Dynamic voltage scaling (DVS) adjusts supply voltage; dynamic voltage and frequency scaling (DVFS) adjusts voltage and frequency together; adaptive voltage scaling (AVS) uses feedback to account for process and temperature variation. Lower voltage reduces dynamic power strongly because voltage is squared in the dynamic-power relationship, but it also increases delay. Apply timing guards, use level shifters where signals cross voltage domains, and verify the voltage-domain design and power intent.
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The 2026 review summarizes cited AVS studies reporting energy reductions of up to 60% against a fixed reference and a roughly 64% claim against fixed-voltage systems. These are study-specific results, not guaranteed savings for an arbitrary ASIC; the review’s summaries do not establish one common workload or implementation basis for applying those figures universally.
2. Gate clocks to inactive logic
Clock gating stops clock transitions from reaching idle registers or blocks, avoiding clock-capacitance switching and downstream sequential activity. An IEEE 2025 clock-gating survey says the clock network can account for 15–45% of total power in modern VLSI circuits. That range describes the survey’s cited context, not a prediction for every chip.
Choose and implement gating with attention to the control logic’s overhead, glitch safety, clock skew, and test access. The survey compares latch-based, data-driven, and look-ahead approaches; their suitability depends on the design and clocking methodology. Verify that the gated clocks remain testable and that enable conditions cannot create unsafe clock pulses.
3. Power-gate inactive blocks
Power gating, often implemented with multi-threshold CMOS (MTCMOS), uses high-Vth sleep transistors to disconnect an inactive block from its supply and reduce leakage. It is most relevant when a block remains inactive long enough for the leakage saved to outweigh the cost of entering and leaving the off state.
Plan for wake-up latency and inrush current, and determine whether state must be retained or restored. Isolation is needed where signals from a powered-down block could affect active logic. The implementation must also account for area, power-grid drop, and the design’s power intent.
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4. Assign multiple threshold-voltage cells
Use low-Vth cells where speed is necessary and high-Vth cells on paths with sufficient slack. Higher-threshold cells reduce leakage, while low-threshold cells can help preserve critical-path timing. This makes multi-Vth assignment a targeted optimization rather than a blanket cell substitution.
Use static timing analysis (STA) and characterized library data to guide assignment. Recheck timing after changes: a path that appears slack-rich in one operating condition may constrain the design at another required corner.
5. Use multiple supply-voltage domains
Dual-Vdd or clustered multi-voltage designs place noncritical logic on a lower supply and reserve a higher supply for logic with tighter timing requirements. Clustering low-voltage logic can limit the number of crossings that need level shifters.
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6. Isolate unused operands
Operand isolation holds or clamps datapath inputs when the corresponding result is not needed. Preventing needless input transitions can avoid internal switching in arithmetic or other combinational logic even when the block’s clock remains active.
Include the isolation-control logic in the assessment. Its own power and any effect on timing can reduce or erase the benefit, so check the net result in the implemented design.
7. Resize gates and transistors
Cell sizing changes drive strength and capacitance. Reducing sizes on noncritical paths can lower switched capacitance and leakage, while critical paths may need stronger cells to meet timing. Joint sizing and multi-Vth optimization is a documented strategy for reducing total power while respecting timing.
Check slew and timing as well as power. Resizing changes the physical implementation and can affect routing, so evaluate the result after the relevant optimization and sign-off steps rather than treating smaller cells as an unconditional improvement.
8. Minimize switching through logic synthesis and RTL
Boolean structure, logic factoring, encoding choices, and RTL enables influence switching probability and capacitance. Synthesis can implement equivalent behavior with structures that differ in power, so consider activity alongside timing and area when selecting or constraining an implementation.
Base power estimates on realistic activity propagation. Zero-delay estimates can miss glitches and other switching behavior that affects the implemented design; validate the activity assumptions used to compare alternatives.
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9. Schedule operations and share resources
At the architecture level, scheduling and binding determine when operations run and which functional units perform them. Resource sharing can avoid unnecessary hardware duplication; a schedule can also create idle intervals in which a unit may be power-gated.
Assess the actual workload and account for the costs of making resources idle or reusable. Leakage-aware scheduling can include retention-register and interconnect effects, so the benefit is not determined solely by the count of arithmetic units.
10. Reduce memory access and data movement
Power is spent moving and storing data as well as computing on it. Reducing memory accesses, communication, wire length, or unnecessary precision can lower activity and capacitance outside the arithmetic operators themselves.
Consider scratchpad and data-reuse choices alongside clock and voltage controls. Their value depends on how the target workload accesses data and on the physical cost of the resulting storage and interconnect.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to choose and verify a power optimization
Use the target workload and the source of power to narrow the options. Voltage and clock methods primarily target dynamic power; power gating and multi-Vth assignment primarily target leakage. Sizing, scheduling, memory, and interconnect changes can affect both. For any candidate, evaluate:
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- Whether the workload provides enough switching reduction or idle time to make the technique useful.
- Its impact on timing, area, routing, and power delivery.
- Any control or wake-up latency, state-retention, isolation, or test requirements.
- Verification effort, including voltage-domain crossings, gated clocks, and power intent where applicable.
- Whether the estimated gain survives physical implementation and sign-off.
Compare alternatives using power results based on the same activity vectors, operating corners, and workload. Otherwise, an apparent difference may reflect changed assumptions rather than a real improvement. No single percentage ranks these techniques reliably across process nodes, timing targets, activity profiles, and implementation flows.
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