FIG. 3 illustrates, by way of example, a logical block diagram of an embodiment of control circuitry 300. The control circuitry 300 may be used for locking the optical frequency comb generator 110, such as to cause the optical frequency comb generator 110 to produce an optical frequency with one or more specific characteristics. The control circuitry 300 may be a part of the repetition rate control circuitry 150 and/or the carrier envelope offset control circuitry 160 of FIG. 1. The control circuitry 300 may be configured to receive an error measurement 340, such as from a digital phase detector (e.g., the beat tone digital phase detector 142 and/or the CEO tone digital phase detector 143). The error measurement 340 may include a beat tone error signal, and/or a carrier envelope offset error signal. The control circuitry 300 includes integrator circuitry 310 in series with lead compensator circuitry 311. The error measurement 340 is received by the integrator circuitry 310. The integrator circuitry 310 provides integrator control to the error measurement 340. In some embodiments, the integrator 310 is a split integrator. The integrator circuitry 310 provides an integrator control signal 341 to the lead compensator circuitry 311. The lead compensator circuitry 311 provides lead compensation to the signal and provides an integral-lead control signal 342.