Electronic control systems whose output signal is related to their input signal
- Frequency locked loops - or FLL, a control system that generates an output signal whose frequency is related to the frequency of the input or reference signal
- Phase locked loops - or PLL, a control system that generates an output signal whose phase is related to the phase of an input or reference signal
- Tracking loops - a control system which tracks a given variable
This category has the following 3 subcategories, out of 3 total.