Power Amplifier Switch-On Ramps to Limit Spurious Emissions

The patent applies dynamics by making the gain parameter time-dependent during switching transitions. Instead of abrupt on/off switching, the gain is dynamically adjusted through ramp profiles that gradually increase or decrease over time. This dynamic adjustment smooths the transitions, reducing spectral regrowth and spurious emissions while maintaining acceptable switching speed performance.

The patent changes the gain parameter during switching transitions using predefined ramp profiles. The gain is gradually modified from its initial value to the target value over a specified transition time, rather than changing instantaneously. This parameter change approach directly addresses the contradiction by trading off some switching speed for reduced spurious emissions through controlled gain evolution.

The patent applies partial action by implementing gradual gain changes only during the critical transition periods when switching occurs, rather than continuously modifying the gain during normal operation. The ramp profiles are used selectively during on/off transitions, allowing fast switching when not transitioning while still reducing spurious emissions during the actual switching events.

The patent uses periodic ramp profiles with different characteristics for turn-on and turn-off transitions. By defining specific ramp profiles for different switching scenarios and applying them periodically as needed, the system achieves reduced spurious emissions during transitions while maintaining overall switching efficiency through optimized profile selection.