Passive power factor correction in the form of filtering can be effective within limits, and has the effect of reducing the higher-order current harmonics that contribute to degraded power factor. Such techniques involve putting a low-pass filter in the input side of the power supply to suppress higher-order harmonic components, and then compensating lead/lag characteristics as with conventional power factor. The downside to this scheme is that large and costly inductors and capacitors may be required. Additionally, there are limitations to the input range and power rating when implementing this scheme, so passive PFC circuits are generally able to achieve a power factor in the range of 0.70 to 0.75.