Active circuit for high and ultra high frequencies

摘要

The invention relates to an active circuit for high and ultra-high frequencies which is able to be used as a filter or oscillator and which is able to exhibit a high centre frequency, an also high Q factor, as well as a good selectivity-sensitivity compromise. It comprises a unit (B) containing a filter H(p), an amplifier (g), and a summer (S) for performing the summation of the output signal (Vs3) from the unit (B) and an input signal (Ve) applied to the input of the unit (B), the filter exhibiting a transfer function H(p) of the form IMAGE with p = Laplace variable, and the amplifier used at frequencies close to its cutoff frequency having a low-pass transfer function of order 1. IMAGE