what does the following amplifers used for state one example

what does the following amplifers used for? state one example:

1- Voltage amplifier

2- Current amplifier

3- Transconductance amplifier

4- Transimpedance amplifier

Solution

1.Voltage amplifier is an instrument that amplifies voltage signal. Its output voltage range is often greater than 10V and up to 100V or more. Often time input signal sources are less than 5V, but the load or device under test (DUT) needs higher voltage. Therefore a high voltage amp is needed. For example, in a voltage transient testing, the voltage waveform is often between 12V and more than 60V, but a waveform generator output is 5V maximum into 50 ohm. A voltage amp is needed to amplify the waveform generator’s voltage to produce the 60V needed to test the device under test.

2.Current amplifier is often a very useful piece of instrument to have in the lab. It is very handy for increasing the current driving capability of a function generator or arbitrary waveform generator. Many laboratory applications require high current amp to drive heavy load. Application for high-current amplifiers include driving heavy resistive load, driving magnetic coil, electrochemical reactor, piezoelectric element, and many other applications.

3.A transconductance amplifier (g_m amplifier) puts out a current proportional to its input voltage. In network analysis, the transconductance amplifier is defined as a voltage controlled current source (VCCS) . It is common to see these amplifiers installed in acascode configuration, which improves the frequency response.

4.In electronics, a transimpedance amplifier  is a current-to-voltage converter, most often implemented using an operational amplifier. The TIA can be used to amplify the current output of Geiger–Müller tubes, photo multiplier tubes, accelerometers, photo detectors and other types of sensors to a usable voltage. Current-to-voltage converters are used with sensors that have a current response that is more linear than the voltage response. exampl for this is current controlled voltage source (CCVS).