EE 4770
Homework 1
Due: 2 February
1994
Problem 1:
An integrated temperature sensor converts temperature to current such that
i
=
T
10 K
mA
,
where
T
is the temperature, K is the unit of temperature
1
,Ke
lv
in
,and
i
is the current ﬂowing
through the sensor. Using this sensor design a circuit that will convert temperature in the range

20
◦
Cto40
◦
C linearly to 0 to 10 V
.
Show the following:
•
The process variable to electrical quantity transfer function,
H.
•
The transfer function needed from the conditioning circuit,
C.
•
A schematic of the conditioning circuit, showing the sensor and the value of all resistors and
voltage sources.
Hint: Use the summing ampliﬁer with one resistor replaced by the temperature sensor.
EE 4770
Homework 2
Due: 4 March
1994
Problem 1:
Two options for measuring temperature using an RTD are being considered. In both
options, the resistance of the RTD will be converted into a number which will be read by a com
puter
2
. This number can be further processed in cyberspace to obtain the measured temperature.
Let
T
denote the temperature to be measured and let
D
denote the contents of an area of the
computer memory. Then
D
=
H
(
T
)=
T/
◦
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 Fall '99
 Staff
 1994, RTD, threshold detector

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