奈奎斯特采样率计算器
根据信号频率计算满足奈奎斯特定理的最小采样率。
Minimum Capacitance
50.00 µF
Minimum Capacitance vs Transient Duration
公式
## Decoupling Capacitor Sizing ### Formula **C = I x dt / dV** Where I is the transient current, dt is the duration of the transient, and dV is the maximum allowed voltage droop. Place decoupling caps as close to the IC power pins as possible.
计算示例
0.5 A transient for 10 us, maximum 100 mV droop.
- 01dt = 10 / 1000000 = 0.00001 s
- 02dV = 100 / 1000 = 0.1 V
- 03C = 0.5 x 0.00001 / 0.1 = 0.00005 F = 50 uF
常见问题
Why use multiple capacitor values?
Different capacitor sizes cover different frequency ranges. Use 100nF for high frequency, 10uF for low frequency, together for broadband decoupling.
Does ESR matter?
Yes. Capacitor ESR limits high-frequency effectiveness. Ceramic caps have much lower ESR than electrolytic.
How close to the IC?
As close as possible. Every millimeter of trace adds inductance that degrades decoupling at high frequencies.
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