91.305 home

WED MAY 5
&bull assignment 9: cache memory pdf
due Wed May 12
&bull microprocessor design article pdf

WED APR 14
&bull archlab part B practice html

FRI APR 2
• assignment 8: archlab parts A and B
due Mon Apr 12
    tar
    sum.ys starter file
    pdf handout
for Mon Apr 12: Part A, sum.ys and rsum.ys only

FRI MAR 26
• assignment 7: bomblab
    pdf due Fri Apr 2
    BOMBLAB README txt
    gdb notes pdf txt

FRI MAR 12
• assignment 6 answers out
• mid-term review txt

WED MAR 10
• assignment 4 handed back w/answers

MON MAR 1
assignment 6: memory-mapping and the stack pdf due Mar 10
• appendix b pdf
• cy6264 pdf
• expanddemo.s s
• mystery5000.rel rel

NOTE: THERE IS NO ASSIGNMENT 5.

FRI FEB 20
assignment 4: the HC11 pdf due Feb 27
• java setup html
README FIRST!
• intro to 6811 pdf
• m68hc11e manual pdf
HC11Boot.java
Serial.java
beep.s
BootLoad.java
ReadRel.java
serialxmit.s
BootTerm.java
BootTermSafe.java
analogdemo.s
the above files in a zip

THU FEB 19
• assignment 2 answers out

WED FEB 11
assignment 3b: transistor ckts html due Feb 18

MON FEB 9
• sch draw hints pdf
• volt div, trans reading – no link
assignment 3: state machines pdf due Feb 18

FRI FEB 6
univ closed – class canceled

WED FEB 4
• uml305dev manual pdf
• uml305dev checkout pdf
• datasheets html

MON FEB 2
• labkits distributed
assignment 2: transistors, gates, & mystery chips pdf due Feb 9
• Horowitz/Hill logic implementations no link

WED JAN 28
assignment 1: historic computer html due Jan 30

To format for printing, click here.

resources ikonboard software data links

91.305 Assignment 3B: Transistor Circuits

 

  1. In the circuit below, assume that a logic high (3.6v in this case) is applied to the input. Using blue pen or pencil (NOT black pen), draw on the diagram the path of current flow through the transistor. Indicate with arrows the direction of current as it flows from (+) to (-). Use a thicker line to indicate more current.

  2. In the case above, is the output value a logic high or a logic low? (Circle the correct answer.)

  3. In the circuit below, assume that R1 is 1k and R2 is 500 ohms. How much current flows through R2 when a logic high (3.6v) is applied to the input? Make sure to involve the 0.6v base-emitter voltage drop in your calculation.

     

     

     

     

     

     

     

     

     

    Use the area above for work and your answer.

  4. In the circuit below, assume that a logic high (3.6v in this case) is applied to the input.
    • Draw on the diagram the path of current flow through the transistors.
    • Indicate with arrows the direction of current as it flows from (+) to (-).
    • Use a thicker line to indicate more current.
    • Circle transistor(s) that are turned on.

  5. In the case above, is the OUT2 output value a logic high or a logic low? (Circle the correct answer.)

     

     

     

     

     

  6. With the same circuit, assume that a logic low (0v) is applied to the input.
    • Draw on the diagram the path of current flow through the transistors.
    • Indicate with arrows the direction of current as it flows from (+) to (-).
    • Use a thicker line to indicate more current.
    • Circle transistor(s) that are turned on.

  7. In the case above, is the OUT2 output value a logic high or a logic low? (Circle the correct answer.)

     

     

     

     

     

     

     

     

     

     

  8. The circuit below shows a TTL implementation of a NAND gate.

    Assume that both the inputs are logic high. Circle the transistors that are turned on. Important: when a transistor is off, current is allowed to flow from the base through the collector (backwards to how it would flow if the transistor were turned on).

  9. Same circuit; now assume that both the inputs are logic low. Circle the transistors that are turned on. As before, when a transistor is off, current is allowed to flow from the base through the collector (backwards to how it would flow if the transistor were turned on).


Last modified: Wednesday, 11-Feb-2004 17:44:16 EST by fred_martin@uml.edu