Meaning
Electrical measurement identifies the highest instantaneous flow of charge required by a radio frequency power amplifier during an active transmission burst. Component selection depends on the peak transmit current to ensure that the power supply can handle transient loads. This metric is separate from the average consumption because it defines the stress on the battery and the voltage regulators.
Understanding this value is necessary for designing stable power delivery networks.
Burst Amplitude
Current levels vary depending on the modulation scheme and the required output power of the radio. When the peak transmit current reaches its maximum value, the power management unit must supply sufficient charge to prevent a voltage drop. This value often exceeds the continuous current rating of the battery cells.
High power transmissions in lte or gsm modes create the most demanding load profiles.
Capacitor Buffer
Storage components placed near the module provide the necessary charge during short duration spikes. Using a large capacitor bank reduces the stress on the main battery during the peak transmit current event.
Supply Impedance
Resistance in the traces and connectors causes a voltage drop proportional to the flow of charge. Total circuit impedance determines the actual voltage seen at the module pins.
