Question

A signal is applied at the input terminals of the circuit shown below. To attenuate the input signal by a factor of 10. The values of $R_1,C_1$ respectively are

• A. $9M\Omega ,3.33pF$
• B. $9M\Omega ,270pF$
• C. $\frac{1}{9}M\Omega ,270pF$
• D. $\frac{1}{9}M\Omega ,3.33pF$

Answer 1

The correct option is A $9M\Omega ,3.33pF$

$R_1=R_2(k-1)$

$=1M\Omega (10-1)$

$=9M\Omega$

$C_1=\frac{C_2}{k-1}=\frac{30\text{pF}}{10-1}=3.33\text{pF}$