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What are the disadvantages of using MOSFET instead of BJT?
In MOSFET, Electrostatic Discharge is an issue, so it can cause a problem. It has low current gain & it is not stable. Once the collector current increases then the gain can be decreased. If the temperature increases then the gain can also be increased. It has a high current gain which is almost stable for changing drain currents.
Which is the first type of transistor BJT or MOSFET?
The first type of transistor is BJT (Bipolar Junction Transistor) and MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is another type of transistor introduced later. For a better understanding of this concept, here this article gives the main difference between BJT and MOSFET. What is BJT?
How are BJTs used in low current applications?
BJTs are apt for low current applications like switching purposes. The working principle of a BJT involved the use of Voltage between the two terminals such as base and emitter to regulate the flow of current through the collector terminal. For instance, the configuration of a common emitter is shown in the figure below.
Is the temperature coefficient of BJT positive or negative?
The temperature coefficient of BJT is negative, so resistors are essential throughout the parallel process of the bipolar junction transistor. The secondary breakdown of MOSFET does not happen since the temperature coefficient of this is positive.
Why do op amps use JFETs instead of MOSFETs?
(JFETs are preferred over MOSFETs due to their greater resilience when it comes to brief overloads and static discharges.) These op amps typically use JFETs for the input differential amplifier stage, with most of the rest of the circuit being bipolar for the reasons others have given in their answers.
Can a FET opamp be used with a LM324?
You can get FET input opamps with offset voltages well below a mV, but then compare their price to the LM324. Early FET opamps, like the TL07x and TL08x had other problems, like very high input common mode range headroom at both ends.