Conversor dBm para Watts
Conversão de potência RF bidirecional
Required Parameters
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Quick Answer
dBm is an absolute power measurement referenced to 1 milliwatt (mW). 0 dBm = 1 mW. Every 3 dB increase doubles the power; a 10 dB increase multiplies power by 10.
Conversor dBm para Watts
Converta entre dBm e watts para medicoes de potencia RF.
Formulas
P(mW) = 10^(dBm/10)
dBm = 10 x log10(P/1mW)
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Design Notes
Using dBm makes calculating signal chains incredibly simple by substituting multiplication/division with addition/subtraction. For example, if you output +10 dBm, pass it through a -3 dB attenuator, and add a +15 dB amplifier, the output is simply 10 - 3 + 15 = +22 dBm. Note that in 50Ω systems, 0 dBm corresponds to ~223.6 mV(RMS).
Common Mistakes
- 1
Confusing dBm (absolute power) with dB (relative ratio). You can add dB to dBm, but adding dBm to dBm is mathematically invalid.
- 2
Forgetting that negative dBm still represents positive Watts (e.g., -30 dBm is 1 microwatt, not 'negative power').
- 3
Assuming the calculation depends on impedance. Power to dBm conversion is pure power mapping independent of impedance, though converting it safely to Voltage requires knowing Z0.
Engineering Handbox
1. Use formula: P(W) = 10^(dBm / 10) / 1000 2. 10^(30/10) = 10³ = 1000 3. 1000 / 1000 = 1 Watt
Knowledge Base
O que é dBm?
Medida absoluta de potência em decibéis referenciada a 1 miliwatt. 0 dBm = 1 mW. Cada 3 dB duplica.
Como converter dBm para watts?
P(W) = 10^(dBm/10) / 1000. Exemplo: 30 dBm = 1W.
Diferença entre dBm e dB?
dBm é nível absoluto (ref. 1 mW). dB é razão relativa. Pode somar dB a dBm, mas nunca dBm + dBm.
Valores dBm para memorizar?
0=1mW, +10=10mW, +20=100mW, +30=1W. Negativo: -10=0,1mW, -30=1µW.
Intensidade típica de sinal WiFi?
Excelente: -30 a -50 dBm. Boa: -50 a -67 dBm. Fraca: -72 a -80 dBm.