3. Electronics and Circuits

Analog Electronics — Quiz

Test your understanding of analog electronics with 5 practice questions.

Practice Questions

Question 1

In an inverting amplifier configuration using an ideal op-amp, the inverting input is held at a “virtual ground.” Which statement best describes the virtual ground concept?

Question 2

A non-inverting amplifier uses feedback resistor R_f = 90 k$\Omega$ and input resistor R_i = 10 k$\Omega.$ What is its closed-loop voltage gain A_v?

Question 3

An op-amp has a gain-bandwidth product (GBW) of 1.2 MHz. If configured as a non-inverting amplifier with closed-loop gain $A_{cl} = 40$, what is the amplifier’s approximate bandwidth?

Question 4

Consider a passive first-order RC low-pass filter with R = 1 k$\Omega$ and C = $0.1 \mu$ F. What is its cutoff frequency $f_c$, where the output signal power is half its low-frequency value?

Question 5

Which op-amp configuration is most suitable for converting the small current output of a photodiode into a proportional voltage signal in a sensor front-end?