In FIG. 20, U3A may require frequency compensation to avoid oscillation via a compensating capacitor (e.g., C5) coupled to the output of U3A and the (?) input of U3A. Of course other methods of frequency compensation may be provide such as coupling one or more capacitors at the gate and or drain of Q1B to provide a roll-off in frequency response that enables stable operation without oscillation in U3A.