8/13/2019 DEC Final2012

1/1

Course: Digital Electronic Circuits

Year: 3rdyear - Computer

Department: Electronics and Comm. Dep

Term: 1stterm (Sept-Jan)

Answer All Questions

Question (1)

a) The differential amplifier in Fig.(neglect the effect of ). Then fi

b)The Tunnel Diode exhibits a spenergy band gap diagrams),th

I- the Diode act as a conductor f

II- the Diode act as a negative res

III- the Diode act as a convention

Figure (1)

Question (2)

(a) The R-2R ladder for a DAthat the currents controlled by t

(b) The design of a 4-bit flash AI- How many comparators are r

II- For an input signal in the ra

III- Show how they can be geneIV- Indicate the digital code yo

for an input of 0 V, +5.1 V, an

Figure (3)

1

Final Exam

Part 2

Date:

Time:

. ages:

!uesti

1 uses transistors with = 100. Evaluate thend the CMRR, in dB.

cial characteristics shown in Fig. 2, explain

reasons behind the following:

om Point A to Point B,

istance from Point B to Point C,

al forward diode at Point C.

Figure

is shown in Fig. 3, What is the input resis

e switches are binary weighted.

DC such as that shown in Fig. 4 is being con

quired?

ge of 0 to +10V, what are the reference volt

rated using a 10-V reference and several 1 K u expect at the output of the comparators an

+10 V.

Figure (4)

Jan. "# $%1$

&% 'inutes

1

ns: $

overall voltage gain /

(with drawing the diode

(2)

tance seen by V? Prove

sidered:

ges needed?

resistors?d at the output of the logic