The Operational Amplifier - Op-Amp Input Modes and Parameters

7 important questions on The Operational Amplifier - Op-Amp Input Modes and Parameters

Identify the type of input mode for each op-amp in Figure 12–61.

(a) Single-ended differential input
(b) Double-ended differential input
(c) Common-mode

A certain op-amp has a CMRR of 250,000. Convert this to decibels.

CMRR (dB) = 20 log(250,000) = 108 dB

The open-loop gain of a certain op-amp is 175,000. Its common-mode gain is 0.18. Determine the CMRR in decibels.

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An op-amp datasheet specifies a CMRR of 300,000 and an Aol of 90,000. What is the common mode gain?

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Distinguish between input bias current and input offset current, and then calculate the input offset current in
Determine the bias current, IBIAS, given that the input currents to an op-amp are 8.3 mA and 7.9 mA.

Input bias current is the average of the two input currents. Input offset current is the difference between the two input currents.

Figure 12–62 shows the output voltage of an op-amp in response to a step input. What is the slew rate?

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How long does it take the output voltage of an op-amp to go from -10 V to +10 V if the slew rate is 0.5 V/ms?

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