The components in the circuit shown below are ideal. If the op-amp is in positive feedback and the input voltage $V_i$ is a sine wave of amplitude 1 V , the output voltage $V_0$ is

In the circuit shown below, all the components are ideal. If $V_i$ is +2 V , the current $I_0$ sourced by the OpAmp is $\_\_\_\_$ mA .

Using the incremental low frequency small - signal model of the MOS device, the Norton equivalent resistance of the following circuit is

The base of an $n p n$ BJT $T 1$ has a linear doping profile $N_B(x)$ as shown below. The base of another $n p n$ BJT $T 2$ has a uniform doping $N_B$ of $10^{17} \mathrm{~cm}^{-3}$. All other parameters are identical for both the devices. Assuming that the hole density profile is the same as that of doping, the common - emitter current gain of $T 2$ is