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Transistor current sources are widely used in analog ICs both as biasing elements and as load devices for amplifier stages. Justify the reasons for using current sources in integrated circuits. What is the advantage of widlar current source over constant current source?
Using constant current source output current of small magnitude microamp range is not attainable due to the limitations in chip area. Widlar current source is useful for obtaining small output currents.
Sensitivity of widlar current source is less compared to constant current source. Mention the advantages of Wilson current source.
Define sensitivity. Sensitivity is defined as the percentage or fractional change in output current per percentage or fractional change in power-supply voltage. What are the limitations in a temperature compensated zener-reference source?
A power supply voltage of atleast 7 to 10 V is required to place the diode in the breakdown region and that substantial noise is introduced in the circuit by the avalanching diode. What do you mean by a band-gap referenced biasing circuit? The biasing sources referenced to VBE has a negative temperature co- efficient and VT has a positive temperature co-efficient. Band gap reference circuit is one in which the output current is referenced to a composite voltage that is a weighted sum of VBE and VT so that by proper weighting, zero temperature co- efficient can be achieved.
In practical op-amps, what is the effect of high frequency on its performance? The open-loop gain of op-amp decreases at higher frequencies due to the presence of parasitic capacitance.
The closed-loop gain increases at higher frequencies and leads to instability. 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.
Mention the frequency compensation methods. What are the merits and demerits of Dominant-pole compensation? Define slew rate. The slew rate is defined as the maximum rate of change of output voltage caused by a step input voltage.
Why IC is not used for high frequency applications? IC has a low slew rate because of the predominance of capacitance present in the circuit at higher frequencies. As frequency increases the output gets distorted due to limited slew rate. What causes slew rate?