Syöttökapasitanssi

Syöttökapasitanssi, often translated as input capacitance, refers to the effective capacitance seen at the input terminals of an electronic component or circuit. This capacitance arises from the physical structure of the component, including the capacitance between internal conductive elements and between these elements and the surrounding environment. It is a crucial parameter in high-frequency circuit design as it can limit the bandwidth and affect the signal integrity.

For a transistor, input capacitance is typically a combination of gate-to-source capacitance (Cgs) and gate-to-drain capacitance (Cgd), the latter being amplified by the Miller effect. In operational amplifiers, the input capacitance contributes to the roll-off of the frequency response and can interact with external components to create undesirable effects. When analyzing a circuit, the syöttökapasitanssi of individual components can be combined with other parasitic capacitances to determine the overall input capacitance of a stage or a complete circuit. This capacitance, along with the input impedance, dictates how the circuit will behave when driven by a signal source. Minimizing input capacitance is often a design goal for achieving higher operating speeds and better performance in many electronic applications.