In a voltage-voltage feedback as shown below, which one of the following statements is TRUE, if the gain k is increased?

In the circuit shown below the op-amps are ideal. Then V_out in Volts is

In the circuit shown below, what is the output voltage (v_out ) if a silicon transistor Q and an ideal op-amp are used?

Bits 1 and 0 are transmitted with equal probability. At the receiver, the pdf of the respective received signals for both bits are as shown below.

The optimum threshold to achieve minimum bit error rate (BER) is