lähtöjänniteimpedanssin

Lähtöjänniteimpedanssi, often referred to as output impedance in English, is a fundamental electrical parameter describing the impedance presented by an electronic circuit or device at its output terminals. It represents the internal resistance of a voltage source or amplifier. When a load is connected to the output, the source's internal impedance, along with the load's impedance, forms a voltage divider. This means that the voltage delivered to the load will be less than the open-circuit voltage due to the voltage drop across the output impedance.

A low output impedance is generally desirable in audio amplifiers and power supplies. This is because it allows the source to deliver more current to the load without the output voltage dropping significantly. A low output impedance ensures better transfer of power and minimizes distortion caused by variations in the load. Conversely, some circuits, like radio frequency oscillators or certain sensor interfaces, might intentionally have a higher output impedance to match it with the impedance of the transmission line or subsequent stage for maximum power transfer or signal integrity.

The concept of output impedance is crucial for understanding how circuits interact and how power is delivered. It influences voltage regulation, frequency response, and overall performance of electronic systems. When designing or analyzing circuits, considering the output impedance is essential for predicting behavior and achieving desired outcomes.