A small signal source, $V_{i}(t)=A \cos \left(10^{5} t\right)+B \sin \left(10^{7} t\right)$ is applied to a BJT circuit as shown in the Figure.
Assume zero source resistance, $V_{B E}=0.7 \mathrm{~V}, \beta_{d c}=99$, Early voltage $=100 \mathrm{~V}$ and
Thermal voltage $=25 \mathrm{mV}$. Effect of internal parasitic capacitances of the BJT may be neglected.
Which expression is the best approximation of the output voltage $V_{o}(t)$?
- $-9.1\left[A \cos \left(10^{5} t\right)+B \sin \left(10^{7} t\right)\right]$
- $9.1\left[A \cos \left(10^{5} t\right)-B \sin \left(10^{7} t\right)\right]$
- $-190.4\left[A \cos \left(10^{5} t\right)+B \sin \left(10^{7} t\right)\right]$
- $190.4\left[A \cos \left(10^{5} t\right)-B \sin \left(10^{7} t\right)\right]$
