EET370 Notes on Signal Processing Techniques - Aet.calu.edu

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Nov 24, 2013 (3 years and 8 months ago)

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EET370 Notes on Signal Processing Techniques


I.

Comparator circuits with hysteresis


The comparator circuit shown in figure 1a and figure 1b has an upper threshold voltage,
V
u
, and a lower threshold voltage of V
L
, as shown below:


V
u

=
4
1
4
1
th
R


R
VR

R

V







Eq (1)

and

V
L

=
4
1
4
1
th
R


R
VR

R

V






Eq(2)




Figure 1 a


Figure

1b

Note that R
4

= R
2

+ R
th




II.
a)

The
OP Amp
Astable multivibrator circuit


T =
)
R
R
2

1
1
ln(

C
2R
1
2
f


and

f =
T
1



Eq(3)


Figure

2
a


II b
)

The

555 Astable Muitivibrator

circuit







f =
)C
2R
(R
1.45
B
A




Eq (4)



Figure 2b


II

c)

The CMOS Nor
-
Gate Astable Muitivibrator circuit







f =
C

R
0.45
1

if R
2
>> R
1



Eq(5)


Figure 2c







Figure 2d



Free
-
running






Oscillator disabled for S
1

open









Oscillator enabled for S
1

closed




III a)

The
Op
-
Amp
Monostable Multivibrator circuit


T =
PW =
)
R

R
R
ln(

C
R
2
1
1
f




Eq (6
)



Figure 3a



III b
)

The 555 Monostable Multivibrator circuit









T =
PW =

1.1 R
A
C



Eq(7
)




Figure 3b



II c) The CMOS Nor
-
Gate Monostable Multivibrator circuit







T =

PW =
0.7 RC




Eq(8)





Figure 3c