The follow
ing post has two assignments namely;
1.Freedom of the Press and the Right to a Fair Trial
Every person tried for a crime
in a court of law
in this country has the right to a fair trial. Under the Sixth Amendment to the Constitution, that trial must be public. Under the First Amendment,
the Press enjoys freedom of press.
In a 1-2 page paper answer the follow
ing, us
ing the First Amendment to support your answer:
Do you believe that the press can have an effect on a potential jury pool thereby deny
ing a defendant the right to a fair trial? If so, how? If not, why?
2.Solids
1. In a p+np bipolar transistor circuit, grounded base circuit, a=0.99. The
input circuit has a battery voltage of 1 V. Assume the
input diode turns on at 0.6V(i.e. no IE until 0.6V, after
that the diode current
increases vertically without resistance) .The series resistance
in the
input circuit is 100 ohm. The output circuit has a battery voltage of 40 V, and a load resistance
in
the output is 1k ohm.
Draw the dc Q conditions for both
input and output. What is the DC Q po
int current and voltage
in the output collector-base circuit? Draw a load l
ine curve for the
input and
output. Show the
intersection po
ints for both.
2. In the above transistor, if Wb=1 micrometer, and the dop
ing
in the base is 2E17/cm3, and base and collector are equally doped, at what battery voltage
in the CB circuit will the device
break down? The Avalanche field is 5E5 V/cm.
3. In the transistor of #2, if I reduce the base and collector dop
ing to 1E16/cm3, at what battery voltage
in the CB circuit will the transistor break down?
4. In problem 1, now I overdrive the transistor by reduc
ing series resistance
in the
input circuit. [That drives more current
in the
input and therefore
in the output circuit]. Assume that
saturation occurs when Vcb flips sign and become +0 .4V. What must the new series resistance
in the
input circuit be to achieve this? Assume that until then, a=0.99.
5. MOSFET amplifier. n channel. VT=1V. VGS=3 V. Z/L=40. Mobility=500 cm2/V-s. Cox=3.45E-7 F/cm2. Battery voltage
in the output circuit= 40 V. RG (
in the gate circuit)=100 ohm. RL
in the output
circuit =2k. A small ac voltage is
in the
input circuit.
i) Draw the dc and ac equivalent circuits
ii) Draw the I-V curve on the output. Show the value of the saturation knee- po
int. Show the load l
ine and
intersection(Q) po
int. Calculate the Q po
int values for current(IDS) and voltage(VDS)
iii) Calculate trans-conductance gm.
iv) Calculate the amplification factor.
6. Now I use the MOSFET of #5 as a logic gate –
inverter. Assume that the I-V curve only has two regions-l
inear from 0V to knee po
int for saturation, and then saturation I value (two straight
l
ines). Us
ing this approximation, draw IDS vs. VDS curves (to scale) for values of VGS
increas
ing by 1 V from 0V. A family of curves will result- 5
in all. Label each one with the VGS value. What
is the value of the output voltage when the MOSFET is used as an
inverter with VGS= 4V? What is the current?