This converter makes it possible to transform a voltage value expressed in dBmV into corresponding power in dBm, taking into account the characteristic impedance of the system. It is particularly useful for radio frequency engineers who work on signal transmission and equipment calibration.
Formula
dBm = dBmV – 30 – 10 × log10(Z₀)
Explanation of the formula
The conversion begins by subtracting 30 from the dBmV value in order to go from a voltage scale to a power scale in mW. Then, we adjust according to the characteristic impedance Z₀ of the system using the term 10 × log10(Z₀). This helps to correctly reflect the actual power transmitted in a given circuit.
Uses
- Evaluate the real power from a signal measured in dBmV.
- Convert voltage measurements for RF system performance analyses.
- Calibrate receiving and transmitting equipment taking into account line impedance.
- Ensure compatibility and consistency of measurements between different instruments and standards.