We have an amplifier that draws 2A from a 15-V dc power supply. The input signal current is 1 mA rms, and the input resistance is 2 kΩ. The amplifier delivers 12 V rms to an 8-Ω load. Determine the power dissipated in the amplifier and the efficiency of the amplifier.

Figure QI shows the circuit diagram of a "Logarithmic Amplifier". In this circuit the feedback resistor of a normal inverting amplifier is replaced by a silicon diode. Since the current flowing through the diode increases exponentially with the voltage across the diode, the voltage across the diode will be proportional to the logarithm current flowing through it. Hence the output of the circuit is proportional to the logarithm of the input voltage. QI DI RIN Al Figure QI The current flowing through a diode is given by the Shock' y Diode Equat n: 1,=1, (e" =1) where , is the current flowing through the diode g is the charge on the electron (given at the back of the examination sheet) V, is the voltage across the diode K, is Boltzmann's constant (given at the back of the examination sheet) Tis room temperature (given at the back of the examination sheet) Given that /,> 1, an approximate expression for V, as a function of I, is Continued overleaf Page 2 of 9 QI (a) 0) Neglecting any input…

Design an transistor amplifier with a total voltage gain of 40. The signal source has a 10 kohm impedance. The load is 5 kohms. Please show all work.

VoD +12 V For the circuit of the adjacent figure a) Given that Ip = 2.83 mA, VGS(om=-7 V and Ipss = 8 mA , find VDs and VGs.. b) If a 50 mV rms input signal is applied to the amplifier, what is the peak-to-peak output voltage? gm = 5000 µS. c) Calculate the output resistance. %3D Ro 10AF 0.1 uF R 10 L. Ra 10 MA 10kn ID= 2.83 mA, Vas (Oef)=-7V. %3D