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ENGR-2300 Quiz 3 Spring 2024 ENGR-2300 Electronic Instrumentation Quiz 3 Spring 2024 Print Name RIN Se Lite EW Section I have read, understood, and abided by the Collaboration and Academic Dishonesty statement in the course syllabus. The work presented here was solely performed by me. Signature: Date: On all questions: SHOW ALL WORK. BEGIN WITH FORMULAS, THEN SUBSTITUTE VALUES AND UNITS. No credit will be given for numbers that appear without justification. Unless otherwise stated in a problem, provide 3 significant digits in answers. Read the entire quiz before answering any questions. Also it may be easier to answer parts of questions out of order. E J You must include units. 1 S. Han and N. Maldonado ENGR-2300 Quiz 3 Spring 2024 1. Timer 555 circuit questions. [25 points] 10k >p1 D UO Vee | si Vv ul + R2 TRIG DIS _ 10k | oe sv ouT THRS Trig-Thr a RST av = OME ps “Jo.o1ne 1Meg Figurel A. Using a 555 timer, a multivibrator circuit is built as shown above. [7 pts] i. What kind of multivibrator circuit is this? [1 pts] Actyble ple Uibsotos: CBcei ator: y) ii. | Determine the ‘ON’ time and ‘OFF’ time for this circuit. [2 pts] K fok 1= fo Ton = 0-693 Chr #RardCr R2=70k ) Cy =0.1 MF. Tom = L3hh ms. TH =0.673ms iii. | Determine the frequency for this circuit. [2 pts] f- A hth (Rr #ark2)-C% = Zz eran = 482 E J You must include units. 2 S. Han and N. Maldonado ENGR-2300 Quiz 3 Spring 2024 iii. | What are the max and min voltages indicated as A and B. Evaluate the two voltages. [3 pts] mx: Vee Zasv. HX = 2.333V t ! Win Veo =5V by =7bsqV iv. Sketch the Vout pulse train on the same plot below. Clearly annotate the ‘ON’ and ‘OFF’ time duration with time units. [4 pts] 5.0V 4.5V4 4.0V4 3.5V4 3.0V4 2.5V4 2.0V4 1i5V 1.0V4 0.5V4 0.0V T 4,056 —Ar5s SOs C. We want to expand this circuit to build a PWM (pulse width modulator) for the square wave input as you did in the Project 4. Where and how should we connect the input square pulse train to this timer circuit. You can redraw the original circuit above by connecting a pulse input to the proper pin. Use the notation of the pulse train : PULSE input symbol as in LTspice. You don’t need to fill out the pulse parameters in detail. Or, you can briefly describe how to connect the pulse input in words [5 pts] ca Aad pile ing or = |" | between Co £ GD Pl. PU "Sr pulse inp pe pwd Jo.aye X & shevld be comeckl tp t pase O CV Ceontrel Uoteate E J You must include units. 4 S. Han and N. Maldonado ee PRT eR ENGR-2300 Quiz 3 Spring 2024 2. Digital Logic circuits. [25 points] A. A simple logic gate can be built out of transistors and resistors. Complete a logic table with A and B as inputs, and C and D as the outputs. [6 points] v svicte R1 R2 2 0.5k 4.7% lL =o ra ot - A o-WM— 10k Q2N2222 R3 80D rs © 8 ‘Or 2m Q2N2222 = Q2N2222 =o (0) © A’ po & pe O O ( B. Based on the truth table in question A, redraw the circuit using appropriate gate symbols. [5 points] E I You must include units. 5 S. Han and N. Maldonado ENGR-2300 Quiz 3 Spring 2024 CLK D. On the chart below, draw 5 pulses of a periodic square wave pulse of duty cycle 0.5 and a frequency of 1kHz. Use this signal as the clock and calculate and draw A,B,C. Assume the flipflop outputs Q were initially high. [9points] +5v J a [ats S—b FFA nl 4 Qa B > FF2 Cl. e 1 | | _| 8S @G66a T T T T T Ooms O.5ms fms Sms = 2.ms Sms T T 7 45ms Sms 5.Sms_— 8.0m You must include units. 7 S. Han and N. Maldonado ENGR-2300 Quiz 3 Spring 2024 3. Comparator and Schmitt trigger Analysis [25 pts] A. The following figure shows a comparator circuit with a reference voltage (Vref). Sketch a plot for Vout, when Vin is given as in the plot, and Vref=- 2V. The voltage supply of Vs is 5V and -5V. Assume that the saturation voltages are Vs [3 pts] $v Vout Vs cv T T T T T 0.0ms 0.3ms 0.6ms 0.9ms 1.2ms 1.5ms 1.8ms 2.1ms 2.4ms 2.7ms 3.0m: Vege 2-QV, Vs-tov vn > (oan = a sn (“" : mee) Vin V : Vos F E J You must include units. 8 S. Han and N. Maldonado ENGR-2300 Quiz 3 Spring 2024 Vout vin D. What are the two possible states of Vout? [3 pts] Gy Two scdvvetion Voltgres © Vt € VO : 6v &-bV E. Evaluate the two threshold voltages at input terminals of Nate m pts] = 6V ae -V; —lk__ Vout , Vv C Vow ref). 7 = ak =((v-iv)-e +1V = Qv. + Vref Vote -bV. Vas (-év-7v)- t40v -ive = =og V E J You must include units. 10 S. Han and N. Maldonado Vout: High(bv) te Lod @ Vinz2V ENGR-2300 Quiz 3 Spring 2024 Vouk > Lew (-6V) +o High @ Vin=-0.¢v F. Sketch the Vout on the following plot where Vin is given. [Spts] eed en Pe _ be T T = J T T T 0.0ms 0.3ms 0.6ms 0.9ms 1.2ms 1.5ms 1.8ms 2.1ms 2.4ms 2.7ms 3.0ms G. What is the main purpose of splitting the single threshold voltage for the comparator application into two threshold voltages when Vout switches from high-to-low or low- to-high transition? [2 pts] 76 adejd aneliple Anizyering when nped: siypab 0s Leaded bith high frpory Deis, by Moxey hipiteracr LulSeen ta. Live Lianaitions . Mote bare can be avedlel H. Sketch the Vin vs. Vout. Clearly indicate the change of Vout and Vin with arrow marks for both directions [3 pts] Vout “ya E J You must include units. 11 S. Han and N. Maldonado ENGR-2300 Quiz 3 Spring 2024 region D is called: region B is called: a. the reverse bias region (a)the reverse bias region b. the saturation current (0) b. the saturation current c. the forward bias region c. the forward bias region (the breakdown region d.the breakdown region C. Plot the input and output for the following diode circuit. Give clear annotations on critical points such as peak voltages and axis crossing points. [8 pts] RI e phe ~ “wv. DM IT D3 DIN4143 wl yy 02 VeeL ss ) DIN4148 FREQ = 1k DIN4148 D1 0 T T T t T T t 0.0ms 0.2ms o.dms 0.6ms 0.8ms 4.0ms 1.2ms 1.4ms 4.6ms 1.8ms 2.0ms You must include units. 13 S. Han and N. Maldonado = — ENGR-2300 Quiz 3 Spring 2024 D. Following is a circuit diagram using a Zener diode with Zener break down voltage of 5.3V. V1=12V, Rload=300 ohm, R1=100 ohm. [7 pts] Ve + RI WA =O fis A yl, Lia = vi Vout av | D1 S2N Rload Oo =n i. Find the current through R1. [2 pts] Vp,2 127 S3V 2 6. @ ) Te> SI = 64mA O [Qo ii. Find the current Iz through Zener diode, D1. [2 pts] LD lead - 2:3v =) 6 0) SSM FG ta A Le= Le,- Lhad= 49.33mA4 0 iii. Find the power consumption in Rload. [3 pts] @ Prog : Vivsad * then * 5.3 v IF 64 aA = 3,6 3mW 0 E I You must include units. 14 S. Han and N. Maldonado 
