PLL Ramp Generation with Phase Error Prediction for Fast Settling

The patent applies preliminary action by predicting the phase error in advance using a phase error prediction circuit. The predicted phase error is calculated based on the current phase detector output and oscillator gain, and this prediction is used to pre-adjust the loop filter output. This allows the system to proactively compensate for phase errors before they fully develop, significantly reducing settling time and preventing frequency overshoot and undershoot.

The patent introduces a phase error prediction circuit as an intermediary element between the phase detector and the loop filter. This prediction circuit acts as a mediator that processes the phase detector output and generates a predicted phase error signal, which is then combined with the actual phase error. This intermediary structure enables the system to anticipate and compensate for phase errors, resolving the contradiction between fast settling time and system complexity.

The patent implements feedback by using the phase detector output to continuously update the phase error prediction. The predicted phase error is fed back to adjust the loop filter output in real-time, creating a closed-loop control system. This feedback mechanism ensures that the system continuously compensates for phase errors, improving measurement accuracy while managing complexity through efficient use of existing signals.

The system applies self-service by using its own internal signals (phase detector output and oscillator gain) to generate the phase error prediction. The phase error prediction circuit utilizes existing system resources without requiring external input, enabling the system to self-correct phase errors and improve measurement accuracy autonomously.