EE8451 Important Questions Linear Integrated Circuits and Applications

EE8451 Important Questions Linear Integrated Circuits and Applications LIC Regulation 2017 Anna University free download. LIC Linear Integrated Circuits and Applications Important Questions EE8451 pdf free download.

Sample EE8451 Important Questions Linear Integrated Circuits and Applications LIC:

1. Why open loop op-amp configurations are not used in linear applications?

The open loop gain of the op-amp is not a constant and it varies with changing the
temperature and variations in power supply. Also the bandwidth of the open loop op-amp
is negligibly small. For this reasons open loop op-amp configurations are not used in linear
applications. EE8451 Important Questions Linear Integrated Circuits and Applications

2. What is the need for frequency compensation in practical op-amps?

Frequency compensation is needed when large bandwidth and lower closed loop gain is
desired. Compensating networks are used to control the phase shift and hence to improve
the stability. EE8451 Important Questions Linear Integrated Circuits and Applications

3. Define slew rate. What causes slew rate?

The slew rate is defined as the maximum rate of change of output Voltage caused by a step
input voltage. An ideal slew rate is infinite which means that op-amp’s output voltage
should change instantaneously in response to input step voltage. Causes: There is a
capacitor with-in or outside of an op-amp to prevent oscillation. The capacitor which
prevents the output voltage from responding immediately to a fast changing input. Slew
rate of 741 IC is 0.5V/μS.

4. Define an operational amplifier. EE8451 Important Questions Linear Integrated Circuits and Applications

An operational amplifier is a direct-coupled, high gain amplifier consisting of one or more
differential amplifier. By properly selecting the external components, it can be used to
perform a variety of mathematical operations.

5. Mention the characteristics of an ideal op-amp.

 Open loop voltage gain is infinity.
 Input impedance is infinity.
 Output impedance is zero.
 Bandwidth is infinity.
 Zero offset. EE8451 Important Questions Linear Integrated Circuits and Applications