Physics 316a - 2008         Assignment 2       Due: Tuesday, Sept. 16

Topic

Primary source

Alternate source

Critical concepts

applications of diodes

H&H 1.29, 1.31

 

 

background on transistors

H&H Intro. to Ch. 2

 

 

current amplifer transistor model, emitter-follower

H&H 2.01, 2.03

LM 84-87

Ie = (1+ b) IB

b is not a reliable parameter

VB » VE + 0.6 Volts (in normal op.)

Fig. 2.2 (p. 62)

transistor switch

H&H 2.02

 

how to make a transistor switch, meaning of “saturation”

VB » VE + 0.6 Volts model for transistor

LM87 (start at “B. The simplest view”)

 

VB » VE + 0.6 Volts (in normal op.)

transistor current source

H&H p. 72 (start at “Transistor current source”) through p. 74 (stop before “Deficiencies of current sources”)

 

 

common emitter amplifier

H&H 2.07

 

Discrete transistors can be used to build amplifiers.  [However, most people prefer to use op-amps.], meaning of “biasing”,

appropriate biasing of the base is needed for correct operation

push-pull stage

H&H 2.15 (stop at end of p. 92)

 

important application of PNP transistors

                                         (17 pages total)

Assigned exercises (all group problems):

H&H 2.2 (p. 67), 2.6 (p. 72),

Individual problems: p. 108: Bad circuits A, B, C, D

 

Notes: For the "Bad circuits", you are to provide a brief explanation for what is wrong for each circuit, and also provide a corrected version.  When there are several circuits which are supposed to do the same thing, you need only provide one correct version (though you do need to explain what's wrong with each of the bad versions).

 

An "AC-coupled follower" is a follower that need only work at AC, i.e. it need not faithfully reproduce the DC level of the input.