The invention relates to a phase lock loop (100) comprising: - a loop filter (140), - a voltage controlled oscillator (150), - a frequency divider (160), - a frequency lock detector (113), able to emit a frequency lock indication signal (LOCK), - a digital phase and frequency comparator (110), - a charge pump (111), and - an analogue phase comparator (120). The loop is essentially characterized in that it further comprises a switch (130) equipped with an output connected to the loop filter (140), and with two inputs, this switch being able to selectively connect the first input, originating from the analogue phase comparator, to its output in response to the lock indication signal; and its second input, originating from the digital phase and frequency comparator, to its output, in the absence of the lock indication signal.