Linear Integrated Circuit Multiple Choice Questions on “Interpreting of Data Sheets – 1”.
1. How many sets of electrical specification are there for 741C op-amp?
A. Five
B. Eight
C. Two
D. Ten
Answer: C
Clarification: There are two sets of electrical specifications. One set of specification applies at room temperature of 25oC , whereas the other set applies to the commercial temperature range from 0 to 70oC.
2. Calculate the input offset current from the circuit shown below:
A. +1.55mA
B. ±1.55mA
C. -1.55mA
D. None of the mentioned
Answer: A
Clarification: The algebraic difference between the current into the inverting and non-inverting terminal is referred to as input offset current.
Iio = |IB1-IB2| =|3.2 – 4.75|=|-1.55|
=> Iio = +1.55mA.
3. What is the value of current drawn from power supply 741c op-amp?
A. Is = 1.5mA
B. Is = 3.2mA
C. Is = 4.0mA
D. Is = 2.8mA
Answer: A
Clarification: Supply current is the current drawn by the op-amp from the power supply; this parameter is not given on most op-amp data. For 741c op-amp, the supply current Is=2.8mA response.
4. Which is a time varying response?
A. Steady state response
B. Transient response
C. Both Steady state and transient response
D. None of the mentioned
Answer: B
Clarification: The rise time and percentage of overshoot are the characteristic of transient response.
5. How is the equivalent input noise voltage and current?
A. Noise voltage = V2/Hz and Noise current = A2/Hz
B. Noise voltage = V3/Hz and Noise current = A2/Hz
C. Noise voltage = V2/Hz and Noise current = A3/Hz
D. Noise voltage = V3/Hz and Noise current = A3/Hz
Answer: A
Clarification: As the electrical noise is random in nature, it is expressed as a root mean square value. The equivalent input noise voltage is expressed as square voltage (V2/Hz) and the equivalent input noise current as square noise current (A2/Hz).
6. The physical closeness of dual and quad package op-amp results in
A. Op-amp coupling
B. Amplifier to amplifier coupling
C. Channel coupling
D. Signal to noise coupling
Answer: B
Clarification: When a signal is applied to the input of only one op-amp, some signal will appear at the output of other op-amp due to the physical closeness of op-amps in dual and quad packages, this causes amplifier to amplifier coupling.
7. A parameter which is applicable only to dual and quad op-amp is
A. Channel separation
B. Gain bandwidth product
C. Long term input offset voltage stability
D. Equivalent input noise voltage and current
Answer: A
Clarification: Channel separation is specified in the dual and quad op-amp data sheet because it is a measure of the amount of electrical coupling between op-amps that are integrated on the same chip.
8. Select the parameter that is not included in the evaluation for ac applications.
A. Gain-bandwidth product
B. Channel separation
C. Slew rate
D. All of the mentioned
Answer: C
Clarification: Slew rate is one of the important factors in selecting the op-amp for ac application particularly at relatively high frequencies application in oscillator, comparators and filters.
9. Which information is not included in a typical data sheet of op-amp?
A. Brief description of the basic type of the device
B. Pin configuration, package type & order information
C. Internal schematic diagram
D. Characteristics analysis of amplifier applications
Answer: D
Clarification: The characteristics of amplifier is included in the datasheet whereas, the application’s characteristics will not be included. Rather a collection of amplifier applications with circuit diagram can be found in the datasheets.