The dynamic translinear principle can be regarded as an extension of t
he conventional, i.e., static, translinear principle, The dynamic tran
slinear principle cannot only be used to realize linear filters, but a
lso constitutes an interesting approach to the implementation of nonli
near differential equations. In this brief, as an example, a dynamic t
ranslinear realization of the nonlinear differential equation describi
ng the rms-dc conversion Function is designed, yielding a circuit with
a high functional density. Measurement results of a protoype semicust
om realization of the rms-dc converter show a good accuracy for crest
factors up to ten and a cutoff frequency beyond 5 MHz for all input si
gnal levels.