A synthesis of an LC simulation—type double‐tuned circuit adjustable by a single parameter

Abstract

AbstractIn this paper we derive a double‐tuned, narrow‐band transfer function and illustrate its LC simulation‐type active realization with low element sensitivity. First, a new double‐tuned function that is adjustable by a single parameter is derived for a circuit using mutual induction. Next, the basic circuit that generates negative feedback with RLC elements and controlled sources is derived. This basic circuit can have a low element sensitivity within the passband, as confirmed by the numerical analysis. As an example of the implementation for the basic circuit, an active RC circuit with the center frequency f0 = 455 kHz and Q = 30 is constructed; transistor gyrators are used for L element simulation; and a single variable resistor is used for the coupling coefficient adjustment. The experimental tuned characteristics for several coupling coefficients are in good agreement with the calculated values.