PART 1. TRUE OR FALSE. Shade \'a\' if the statement is true and \'c\' of the sta
ID: 2249489 • Letter: P
Question
PART 1. TRUE OR FALSE. Shade 'a' if the statement is true and 'c' of the statement is false. If th statement is false, underline the word that makes the statement false and write the word that will make rue beside the number. 1. Operational amplifier provides high gain amplification using an external AC supply voltage. 2. An operational amplifier usually has a low input impedance and low output impedance for ease of coupling to other electronic circuit. 3. An operational amplifier has a very high gain which allows it to be used in high power 4. 5. 6. applications. In the differential mode, a diff-amp can be operated with single-ended or double-ended inputs. Common-mode occurs when equal in-phase voltages are applied to both input terminals. The three basic op-amp configurations: inverting, non-inverting, and voltage-follower employ . negative feedback A non-inverting amplifier configuration has a higher input impedance and a lower output 7. impedance than the op-amp itself (without feedback) A non-inverting amplifier configuration has an input impedance approximately equal to the input 8. 9. 10. 11. resistor Ri. The closed-loop voltage gain is always less than the open-loop vcitage gain The gain of op-amp increases as frequency increases above the critical frequency Negative feedback increases the gain and lowers the bandwidth A practical op-amp has very low input impedance, very high output impedance, and very high 12. open-loop voltage gain ART 2 ? 20 C mnlote the tahle helow Choose the nara roeter in the choices nrovided.Explanation / Answer
1.It is false('c').
- By replacing "AC" with "DC". makes the statement true.
- Operational amplifier provides high gain amplification using an external DC supply Voltage.
2.It is false ('c').
- Input impedance of amplifier is high.
- So, By replacing "low input impedance" with "high input impedance" makes the statement true.
3.It is true.('a').
- Operational amplifier is divided with differtial amplifier, voltage, Voltage amplifier and High Current Output stage.
4.It is true.('a').
- Operational amplifier can be used for inverting, non-inverting (single ended input) and Both input mode.
5.It is true.('a').
- Common mode is defined as when input to both the pins of amplifier is equal (in amplitude and in phase).
6.It is true.('a').
- In non-inverting mode, the input signal is amplified and output with 0 degree phase shift.
- In inverting mode, the input signal is amplified and output with 180 degree phase shift.
- In Voltage follower mode (Buffer mode), Input signal is buffered at output (no amplifier change , no phase change).
7.It is true.('a').
- Negative feedback improve the performance of amplifier by making lower gain (at desired level), increases bandwidth, higher the input impedance and lower the output impedance.
8.It is false ('c').
- The input impedance of non-inverting amplifier is very high with compare to Ri.
- The statement is true if "approximetly equal " replaced with "very high compare ".
9.It is true.('a').
- The closed loop gain of the operational amplifier is lower than open loop gain due to negative feedback.
10. It is false ('c').
- Gain of amplifier decreses after critical frequency.
- The statement is true if "increases" replaced with "decreses".
11. It is true.('a').
- Gain bandwidth product of amplifier is constant. Negative feedback decreses the gain. So, the bandwidth is increases to make the product constant.
12. It is true.('a').
- Practical operational amplifier has low input impedance, high output impedance and high open loop gain.
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