Analog Electronics - Study Mode

[#276] Using the incremental low frequency small-signal model of the MOS device, the Norton equivalent resistance of the following circuit is
Correct Answer

(D) $$frac{{{{ ext{r}}_{{ ext{ds}}}} + { ext{R}}}}{{1 + {{ ext{g}}_{ ext{m}}}{{ ext{r}}_{{ ext{ds}}}}}}$$

[#277] The approximate O/P Frequency of 555 Oscillator for R A = R B = 2.2 kΩ and C = 2000 pF-
Correct Answer

(B) 109.3 kHz

[#278] An OPAMP-based comparator drives an LED, with V F = 1.6V, the current through which is regulated by a 1 kΩ resistor and a silicon diode in series. Assume a ±10V DC voltage is applied as ±V CC respectively to the op-amp. Then find out the current through the LED when the comparator output is +10V.
Correct Answer

(C) 7.7 mA

[#279] Blocking oscillators are used as
Correct Answer

(C) High impedance switches and frequency dividers

[#280] What is the formula of lower cut-off frequency of an RC coupled amplifier?
Correct Answer

(A) $${{ ext{f}}_{ ext{L}}} = frac{1}{{2pi { ext{RC}}}}$$