There are many uses for amplifiers. Some try to achieve extremely high gain such as in a radio receiver. Many try to achieve no overall gain. Examples include mixers and filters. Some only try to achieve limited gain. Oscillators try to achieve zero gain at most frequencies but unity to very high gain at the frequency of oscillation depending on the output wave form required.
Basically - everything in electronics is an amplifier.
The absolute gain of am amplifier is the ratio of output signal to input signal. For voltage or current amplifiers this is usually expressed as field decibels which is 20 log (out/in). For power amplifiers the gain in decibels is 10 log (output power/input power).
If the gain is less than one, the same rules apply but the decibels will turn out to be a negative quantity.
Usually output of an amplifier is a voltage ,...but in case of Operational Transconductance Amplifier ,Iout (current ) is the output. This feature, makes it useful for Electronic control of amplifier gain .
A: the gain will be maximum at the open loop configuration and decrease as frequency increases
In open loop configuration the gain of the amplifier will be infinite, which in turn produces only square wave output.
The series input resistor and the feedback resistor.
Distortion is estimated as closed loop gain divided by open loop gain. If the open loop gain approaches infinity, distortion approaches zero.
Usually output of an amplifier is a voltage ,...but in case of Operational Transconductance Amplifier ,Iout (current ) is the output. This feature, makes it useful for Electronic control of amplifier gain .
low frequency gain will be 20log(Vo/Vin)
IT has very low gain. this is the biggest disadvantage. Thank You.
A: the gain will be maximum at the open loop configuration and decrease as frequency increases
Op amps stands for operational amplifier. An operational amplifiers is a high gain voltage amplifier that requires a differential input and produces single outputs.
It takes the difference between of two input and amplify by the open loop gain of the amplifier or closed loop gain of the amplifier. It is very hard to control open loop gain of 100 Db so it very seldom used
In open loop configuration the gain of the amplifier will be infinite, which in turn produces only square wave output.
The series input resistor and the feedback resistor.
A programmable gain amplifier (PGA) is a electrical circuit that allows the controller (user, machine) to adjust its transfer function so as to provide larger or lesser voltage gain. Usually it is a simple circuit, using an operational amplifier with negative feedback. In the negative feedback loop, several resistors and switches open and close, in order to achieve the desirable gain.
Darlington amplifier has more gain when compared to cascade amplifier .
Distortion is estimated as closed loop gain divided by open loop gain. If the open loop gain approaches infinity, distortion approaches zero.
Ideally: infinite. Practically: very high, at least 1000 often several million maybe billions.