EC Quiz-1

The operational amplifier shown in the figure is ideal. The input voltage (in Volt) is . The amplitude of the output voltage V₀ (in Volt) is _____.

Consider the feedback control system shown in figure below

The value of gain ‘k’ on the root loci at the break point is unity then value of ‘a’ is_______ (0 < k < ∞).

Consider a circuit shown in figure. The circuit functions as

If u = sin (x² + y²) where a²x² + b²y² = 1 & x and y both are variable then value of (du/dx) will be?

If Y- parameter is given by, then calculate Z- parameter?

Modulating signal  is transmitted using PCM system. Minimum possible quantization error should be at atmost 0.5% of maximum amplitude of m(t). Sampling rate is 10% higher than Nyquist rate. Find Bit rate.

Consider a silicon PN junction at T = 300 k with acceptor concentration of N_a = 10¹⁸ cm^–3 and donor concentration of N_d = 10¹⁵ cm^–3. If we change the acceptor doping concentration to N_a = 10¹⁶ cm^–3 by keeping all other parameters constant, then the percentage decrease in built – in potential of the junction will be equal to ________ %.

₍Assume n_i = 1.5 × 10¹⁰ cm^–3, kT = 0.026 eV)

A double conversion superheterodyne receiver is designed with f_IF = 30 MHz and f_IF(2) = 3 MHz. LO frequency of each mixer stage is set at the higher of the two possible values. When the receiver is tuned to a carrier frequency of 300 MHz, insufficient filtering by the RF and first IF stages results in interference from three image frequencies. Those three image frequencies are

Consider the circuit shown below:

All the three NMOS transistors in the circuit have V_T = 1 V, λ = 0, μ_nC_ox = 120 μA/V², L₁ = L₂ = L₃ = 1μm , then gate widths of W₁, W₂ and W₃ are