Device for adjusting the locking of an injection locked frequency multiplier (104, 122), including at least: - a first input configured for receiving a first signal of frequency f1 intended to be applied as input of the injection locked frequency multiplier (104, 122), and a second input configured for receiving a second signal of frequency f2 intended to be outputted by the injection locked frequency multiplier (104, 122); - a sub-sampler configured for carrying out a sub-sampling of the second signal by the first signal or by another signal of frequency f S equal to an integer multiple of the frequency f1 and less than the frequency f2; - a control circuit configured for: • receiving as input a third signal obtained as output of the sub-sampler and corresponding to the second signal sub-sampled by the first signal or by the signal of frequency f S, then • determining that the injection locked frequency multiplier (104, 122) is locked on a frequency equal to a multiple of the frequency f1 when the third signal is continuous and when the injection locked frequency multiplier (104, 122) is not locked on a frequency equal to a multiple of the frequency f1 when the third signal varies over time, then • outputting a fourth signal the value of which is representative of the locking or not of the injection locked frequency multiplier (104, 122) on a frequency corresponding to a multiple of the frequency f1; and wherein the control circuit comprises an integrator filter configured for carrying out a high-pass or pass-band filtering of the third signal, the injection locked frequency multiplier (104, 122) being considered as locked on a frequency corresponding to a multiple of the frequency f1 when the signal obtained by said high-pass or pass-band filtering is substantially zero. - a first input configured for receiving a first signal of frequency f1 intended to be applied as input of the injection locked frequency multiplier (104, 122), and a second input configured for receiving a second signal of frequency f2 intended to be outputted by the injection locked frequency multiplier (104, 122); - a sub-sampler configured for carrying out a sub-sampling of the second signal by the first signal or by another signal of frequency f S equal to an integer multiple of the frequency f1 and less than the frequency f2; - a control circuit configured for: • receiving as input a third signal obtained as output of the sub-sampler and corresponding to the second signal sub-sampled by the first signal or by the signal of frequency f S, then • determining that the injection locked frequency multiplier (104, 122) is locked on a frequency equal to a multiple of the frequency f1 when the third signal is continuous and when the injection locked frequency multiplier (104, 122) is not locked on a frequency equal to a multiple of the frequency f1 when the third signal varies over time, then • outputting a fourth signal the value of which is representative of the locking or not of the injection locked frequency multiplier (104, 122) on a frequency corresponding to a multiple of the frequency f1; • receiving as input a third signal obtained as output of the sub-sampler and corresponding to the second signal sub-sampled by the first signal or by the signal of frequency f S, then • determining that the injection locked frequency multiplier (104, 122) is locked on a frequency equal to a multiple of the frequency f1 when the third signal is continuous and when the injection locked frequency multiplier (104, 122) is not locked on a frequency equal to a multiple of the frequency f1 when the third signal varies over time, then • outputting a fourth signal the value of which is representative of the locking or not of the injection locked frequency multiplier (104, 122) on a frequency corresponding to a multiple of the frequency f1;