For example, the typical value of AVOL of μA741C and LM318 is 200V/mV or 106dB. Its ideal value is infinite, generally between thousands of times and tens of thousands of times. In the absence of negative feedback, the amplification factor of the operational amplifier is called open-loop gain, or AVOL for short. Ⅱ Types of Gain 2.1 Voltage GainĪv=Vo/Vi means that the voltage gain is equal to the output voltage of the amplifier/the input voltage of the amplifier, and the corresponding amplifier is called a voltage amplifier. In addition, the decibel representation and magnification can be converted, whichever is convenient to use. This principle is the same as why we sometimes represent numbers in binary and sometimes in hexadecimal. Taking the logarithm with the base 10, the result will be much smaller. However, sometimes the gain value may be very large, such as 100,000,000 times, which is not conducive to writing and communication. Why use the decibel to express gain? Because use the intuitive description of how many times is intuitive. Power gain Ap(dB)=10log(Ap), here power gain=output power/input power=output current*output voltage/input voltage*input current. The current gain value in decibels is equal to the absolute value of 20 times the logarithm of the base 10 multiple. The value of the voltage gain in decibels is equal to the absolute value of 20 times the logarithm of the base 10 multiple. But the total gain is additive in decibels. When the amplifiers are cascaded, the total magnification is multiplied by the stages. In decibels, take a logarithm first, which is much smaller. For example, a radio needs to amplify about 20,000 times in total from the signal received from the antenna to the output of the speaker. The total magnification of the electronic system is often several thousand, tens of thousands or even hundreds of thousands. And the decibel is a unit of amplifier gain. It also refers to the magnification of voltage or current. CatalogĪmplifier gain is the logarithm of the ratio of output power to input power, which is used to express the degree of power amplification.
AMP TO VOLT RATIO HOW TO
In that way, what the amplifier gain is? How to calculate it? Just read the following notes. For example, the antenna gain is a parameter that represents the radiation concentration of a directional antenna. In electronics, it is usually the ratio of the signal output to the signal input of a system.
In short, its general meaning is the magnification. And it is specified in decibels (dB), that is, the unit of gain is generally dB, which is a relative value. In electrical circuits, Gain generally refers to the degree of increase in current, voltage or power of components, circuits, equipment or systems.
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