RF Unit Converter
Convert between RF units for voltage, power, and current in radio frequency circuits
RF Unit Conversion Calculator
Typical values: 50Ω, 75Ω, 300Ω
Enter voltage in your preferred unit
Conversion Results
Formulas used: P = V²/Z, I = V/Z (where V is RMS voltage)
Input (RMS): 0.7071 V, Impedance: 50 Ω
Conversion note: Peak voltage = RMS × √2, dBμV = 20×log₁₀(V×10⁶)
RF Unit Reference
Voltage Units:
- • V (peak): Peak voltage
- • V (RMS): Root mean square voltage
- • μV (RMS): Microvolts RMS
- • dBμV: Decibels above 1 microvolt
Power Units:
- • W: Watts
- • mW: Milliwatts (10⁻³ W)
- • μW: Microwatts (10⁻⁶ W)
- • dBm: Decibels above 1 milliwatt
- • dBμW: Decibels above 1 microwatt
Example Calculation
50Ω System Example
Given: 1V peak signal, 50Ω impedance
RMS Voltage: 1V ÷ √2 = 0.7071V
Power: (0.7071V)² ÷ 50Ω = 0.01W = 10mW
Current: 0.7071V ÷ 50Ω = 14.14mA
dBμV Conversion
0.7071V RMS = 707,100μV RMS
dBμV = 20 × log₁₀(707,100) = 117.0 dBμV
Common RF Impedances
Key Formulas
RF Circuit Tips
Match impedances to minimize reflections
Use RMS values for power calculations
dBm is referenced to 1 milliwatt
50Ω is standard for most RF systems
Understanding RF Units and Conversions
AC vs DC in RF Systems
RF (Radio Frequency) circuits use alternating current (AC) where voltage and current constantly change direction. This requires different measurement approaches compared to DC circuits.
RMS vs Peak Voltage
- •Peak Voltage: Maximum instantaneous voltage
- •RMS Voltage: Effective voltage for power calculations
- •Relationship: V_rms = V_peak ÷ √2 ≈ V_peak × 0.707
Decibel Units (dB)
Decibel units provide a logarithmic scale useful for RF measurements where values can span many orders of magnitude.
Impedance Matching
Impedance matching is crucial in RF systems to ensure maximum power transfer and minimize signal reflections.
- •Mismatched impedances cause signal reflections
- •Standing waves reduce power transfer efficiency
- •Perfect match occurs when source = load impedance
Standard Impedances
50Ω: Most RF equipment, test instruments
75Ω: Video, cable TV, some antennas
300Ω: Twin-lead transmission lines
377Ω: Free space impedance