So that the circuit becomes,
Thus,

5
To find
From equation (5)
6
To find
7
WKT
8
To find
From equation (7),
Sub equation (7),

Let
9
s
=
10
To find
Differentiating equation (9), WRT
Now multiply and divide by
by equation (9)
11

Relation between S and
Multiply and divide by
12
Relation between S and
by equation (11)
BIAS COMPENSATION:
Compensation techniques use temperature sensitive devices such as diode, transistors,
thermistors, sensistors etc. to maintain operating point constant.
THERMISTOR COMPENSATION:
Thermistors have a negative temperature co-efficient ie. Its resistance decrease
exponentially with increase in temperature as shown below.
Slope of this curve =
Where
temperature coefficient for thermistor.
It is negative.
Therefore, thermistors are said to have negative temperature coefficient of resistance (NTC).

FIRST TYPE:
COMPENSATION TECHNIQUE:
Consider the circuit shown below.
Here in the circuit,
is
( Thermistor resistor), which has NTC.
Thus the original increase in
is compensated and Q- Point is made stable.