For the class B output stage of Figure 2, let VCC = 6 V and RL = 4Ω. If the output is a sinusoidal with 4.5V peak amplitude, find; (a) The output power. (b) The average power drawn from each supply/ (c) The power efficiency obtained at this output voltage. (d) The maximum power that each transistor must be capable of dissipating safely.

Q3 Figure 3 shows the electric scheme of a specific current mirror circuit. (a) Which configuration of current mirror circuit is it? Determine the output resistance Rout of circuit in Figure 3. Show the details of calculation and state any assumption. (b) What is the main advantage of using a cascade current mirror over a simple current mirror made by only two transistors? (c) Iout M3 M2 M4 Vss =0 V Figure 3

4. A Darlington transistor is essentially an array of two transistors connected as shown below. Assume both transistors follow our simple model with a current gain of B=100. Determine the maximum value of R2 that will just saturate the transistors, and pass full current through the load resistance R1. v2 V2 R2 PULSE (0 5 0) Q2 NPN R1 10 Q1 NPN V1 24

Q3 Figure 3 shows two current mirrors based on MOSFET. Derive a formula relating the input current Iin to the output current Iout for the current mirror on the left of Figure 3 stating any assumption. (a) (b) Derive the input resistance Rin and output resistance Rout for the circuit on the left of Figure 3. State any assumption. (c) Derive a formula relating lin and Iout for the circuit on the right of Figure 3 assuming that M1 and M2 are identical, and that the length and width of the channel for the transistor M4 are double respect to those of M3. State anv assumption. VDD M3 M4 out Iout M1 M2 M1 M2 Vss = 0 V Vss = 0 V Figure 3

Time left 1:46:17 A bipolar junction transistor is described in the figure below. The transistor is implemented in the circuit with Vcc, Rc, and RB equal to 16 volts, 2k, and 10kn. Determine the value of Vout if Vin = 1.1V. V... in RB B Vec Ro V E out