In a voltage multiplier circuit, four silicon diodes and four capacitors are connected to a sinusoidal voltage source of amplitude Vin > 0.7 V and frequency 1 kHz. If the knee voltage for each of the diodes is 0.7 V and the resistances of the capacitors are negligible, the DC output voltage Vout after the circuit reaches steady state is closest to:

In a circuit with two identical series-connected NMOS transistors where the top transistor has its gate connected to a 20 V supply and drain connected to a 20 V supply, and both have a threshold voltage of 2 V, neglecting channel length modulation and body effect, what is the output voltage Vout at the source of the top NMOS?

An ideal shunt Zener voltage regulator provides a regulated output of 5.7 V. Determine the required value of the load resistance if the load current is 1 mA, assuming that the Zener diode operates in its stable breakdown region.