Gyrator

As a gyrator (also Dual Inverter ) is called in the electronics a two-port, which can transform any impedances in their dual impedances. That is, a gyrator shows with capacitive output load an inductive input behavior. Actually one can therefore convert a capacitance, an inductance, and vice versa.

General

Gyrators be realized as active electronic circuits, the basic circuit can be the negative impedance converter. However, other electronic circuits may show gyratorisches behavior, such as to levels of emitter coupled bipolar transistors in certain operating point ranges. However, these gyrators reasons of stability are of limited use, as is doing in this circuit, the temperature drift ( temperature dependence of transistor characteristics ) or a negative effect, there are limitations in the work area. In principle gyrator circuits can simulate capacitors and inductors with fixed or variable and usually unusually high capacitance or inductance of high quality, which would not be otherwise so easily doable with the corresponding normal components. The simulated capacitances or inductances can be in the application circuit surrounding the gyrator effective depending on the gyrator circuit to ground or floating. The disadvantage, however, is that a certain work area (voltage, current ) and a limited top operating frequency range for these simulated capacitors or coils must be considered by the used active gyrator components (transistors, operational amplifiers ) through their cut-off frequencies, phase curves, operating voltages, output current productivities and common work areas is given. Gyrators are therefore usually only in the small signal range used. Disadvantage is the inherent noise of the active devices used can affect. But gyrators can be well integrated together with its surrounding application circuit in electronic circuits.

Stable gyrators be realized in the form of two voltage-controlled current sources, consisting of two operational amplifiers with current output ( transconductance ) exist.

In systems theory, a transmission system is referred to as the gyrator if the cumulative value at the output is proportional to the potential size of the input, and vice versa.