Due to an editing error, the last paragraph on page 20 of “Part 1 — SPICE Simulation Provides Advantages for DSP-Based SMPS,” in the March 2009 issue of *PET* contains several errors. The text should have read:

“The later representation is seen to be identical to a delay line, with z^{-n} representing a delay of nT seconds. Transfer functions, including impedance and admittance functions are described as polynomial ratios of the form G = N/D, where N = a_{0} + a_{1}z^{-1} + … a_{n}z^{-n} and D = 1 + b_{1}z^{-1} + … + b_{n}z^{-n} are the numerator and denominator polynomials, respectively. Notice that b_{0} = 1. Then rearranging the following equation with D' = D-1:”

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