Lab 4

Consider Figure 1 and determine as follows. i. Draw the dc and ac equivalent circuits for the common-source amplifier. ii. Determine Ip, VGs, and VDs for a centred Q-point. Idss=15 mA, and VGS(OFF)= -4 V. iii. Determine the voltage gain, Ay. iv. What happen to the voltage gain, A, if RL is increased to 6.6 kN. VDD +15 V Rp 820 N C3 Vout 1 µF Vin RL 3.3 kN 0.1 μF RG 10 MQ Rs 220 N C2 1 μF

1.The voltage measured from the collector to the emitter is the sum of the voltage base-emitter plus the voltage collector-base. Select one: True Or False 2.A decrease in base current of a C-E amplifier causes the voltage measured between the emitter and the collector to increase. Select one: True Or False 3.A FET is ..............controlled device whereas a bipolar transistor is a.............controlled device. Answer:

Question is attached as picture.

Figure 3 shows two current mirrors based on MOSFET. Derive a formula relating the input current In 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 In and Iout for the circuit on the right of Figure 3 assuming that Mi 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 any assumption. V DD M. M4 M1 M2 M1 M2 V'ss =0 V Vss=0 V Figure 3

Remove the bypass capacitor C2 and repeat part (c). Discuss about the effect of the bypass capacitor on the voltage Vout = Vin = AV =

Provide the detailed explanation -

1. Describe the three terminals of a bipolar junction transistor. How they differ with one another? 2. What is the role of biasing in the operation of transistors? 3. Differentiate common base, common emitter and common collector configuration of transistors. 4. Differentiate the regions of operation of transistors. 5. What is the role of a transistor as an amplifier?

answer part b,c, and d

2.1) Design a BJT common-emitter amplifier (use the figure A or B in former page!) with a gain of 9. The Q point parameters should be IC = 3 mA and VCE = ŠV. A power supply of 20 V is available. Manufacturers' spec sheets give: min = 100, ht. = 200.Take VBE = 0.7 V. 2.2) Analyze the BJT circuit given in figure – 1. Determine the collector currents for DC current gains Boc = 100 and BDc = 200. Calculate the Q point of both cases. Detemine the percentage change in Ic (collector current), Vcz (collector-emitter current). Use the below formulas: I -I V -V CE -100) 100 d-200) -100) 100 : % Ic CE( -200) % Ic I (-100) Calculate the DC Load line of circuit. CE( -100) Voc-10" R2=1k2 R1=300k 10V Figure – 1

........ (Figure-1) R. RB= 380kN,Rc= 1kN B = 100, VBB = Vcc=12V RB ww Vec CC ......... I, V CE СЕ V ВЕ BB Q-1-b) Describe briefly the input / output characteristics and application of Common Emitter BJT Configuration

Please all subpart is compulsory for like this please Asap

2) Consider an enhancement MOSFET common source amplifier circuit in Figure 2(a). The output characteristic is showed in Figure 2(b). Assume that the circuit is operating in the saturation region and k = 5 mA/V2. It also given that ra = ro = 00, Cgd = 2 pF, Cgs = 4 pF, Cas = 1 pF, Cwi = 4 pF and Cwo = 3pF. a. Using DC load line, prove that Ino = 22.5 mA and VpsQ = 5.5 V for Vaso = 2.5V. (Please attach the characteristic graph provided in your working solution) b. Draw the AC equivalent circuit at mid frequency. c. Estimate the voltage gain Av = Vo /Vi. d. Determine the dominant high cut – off frequency for the circuit. 10 V Rp 100 2 6 MQ C2 ci Rs RL Vo 1002 R: 5002 Rs Vo 14 MQ Cs 100 2 Vs Figure 2(a) 60- 50 30 20 10 9. 10 Figure 2(b) (yu) 4

Coonsider the common emitter amplifier shown in figure below. Assume a β of 100, VBE = 0.7V, VT = 25mA and VA = 100V.  Draw an equivalent DC model and determine the rπ, transconductance (gm) and ro.  Draw an equaivalent AC model using the small-signal model Find an expression for vbe and vo in terms of the input voltage