  Solid-state qubits hold the promise to achieve unmatched combination of
sensitivity and spatial resolution. To achieve their potential, the qubits need
however to be shielded from the deleterious effects of the environment. While
dynamical decoupling techniques can improve the coherence time, they impose a
compromise between sensitivity and bandwidth, since to higher decoupling power
correspond higher frequencies of the field to be measured. Moreover, the
performance of pulse sequences is ultimately limited by control bounds and
errors. Here we analyze a versatile alternative based on continuous driving. We
find that continuous dynamical decoupling schemes can be used for AC
magnetometry, providing similar frequency constraints on the AC field and
improved sensitivity for some noise regimes. In addition, the exibility of
phase and amplitude modulation could yield superior robustness to driving
errors and a better adaptability to external experimental scenarios.
