jännitevahvistusta

Jännitevahvistus, or voltage gain, refers to the ratio of the output voltage to the input voltage of an electronic circuit or device. It is a fundamental concept in electronics, particularly in the design of amplifiers. A voltage gain greater than one indicates that the output voltage is larger than the input voltage, meaning the signal has been amplified. Conversely, a voltage gain less than one signifies that the output voltage is smaller than the input voltage, indicating a signal attenuation or reduction. A voltage gain of exactly one means the output voltage is equal to the input voltage, implying no amplification or attenuation.

The concept of voltage gain is crucial for understanding how electronic components, such as transistors and operational amplifiers (op-amps), can increase the amplitude of an electrical signal. This amplification is essential in many applications, including audio systems, radio communication, and measurement instruments, where weak signals need to be strengthened to be usable. The unit of voltage gain is typically dimensionless, as it is a ratio, though it can also be expressed in decibels (dB) for logarithmic representation, which is common in audio and RF engineering. The actual voltage gain of a device can vary with frequency, input signal amplitude, and operating conditions.