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GATE 2015 EE - SET 2 - Question 39

Solution :

Astable po-amp multivibrator

Always produces a square wave .

\beta = \frac{R_{2}}{R_{1}+R_{2}} = \frac{2}{2+2}
\beta = 0.5

T = 2RCln\left [ \frac{1+\beta }{1-\beta } \right ]

T = 2 * 1 * 10^{3} *0.25 *10^{-6}ln\left [ \frac{1+0.5}{1-0.5} \right ]

T =  0.5*10^{-3}ln \left [ 3 \right ]

T  = 0.5 * 10^{-3} * 1.098
T  = 0.55 * 10^{-3}

T = 0.55ms

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