Power Amplifier Gain Ramping for Low-Spurious Switching

Before switching on the power amplifier, the gain is preliminarily set to a minimum value to avoid abrupt transitions. The control unit gradually increases the gain from minimum to maximum during the switch-on phase, and similarly decreases it during switch-off, preventing sharp rising and falling edges that cause spurious emissions.

The gain of the power amplifier is made dynamic during switching transitions rather than static. The control unit adjusts the gain continuously during the transition period, creating a smooth transient response that eliminates the abrupt changes responsible for spurious emissions while maintaining fast overall switching performance.

The switching process is divided into periodic phases: a transition phase where gain is gradually varied, and a steady-state phase where full power is delivered. The control unit manages these phases systematically, ensuring that the gradual gain variation occurs only during brief transition periods rather than continuously, thus limiting the time penalty while maintaining emission reduction.

The gain parameter is changed in a controlled manner during transitions, using predefined ramp profiles that balance transition smoothness with duration. The control unit implements these parameter changes only during necessary transition windows, minimizing the time impact while achieving the goal of reducing spurious emissions through smooth gain variation.