| 摘要 |
1. Switched capacities filter simulating a filter with inductancies and capacities, comprising at least three operational amplifiers (A1, A2, A3) each of which is looped by an unswitched capacity (C11 to C33), with switched or unswitched capacities between the output of each amplifier and the input of at least one other or of the same amplifier, the filter comprising a signal input (E) and an output (S), the input of the filter being connected to the inputs of a first, second and third operational amplifiers through a respective one of three capacities, characterized in that the first (10') of these three capacities is a switched capacity corresponding to a transfer function - Cez**-1 wherein Ce is a positive constant, the second (30) is an unswitched capacity having the transfer function Ce.C22 (1 - Z**-1 ) wherein C22 is another positive constant, and the third (40) is a switched capacity corresponding to a transfer function equal to a positive constant. |
