46 
of Beakley's method, which involves more calculations but can 
also be applied to the asymmetric half-bridge. Figures shown 
will also give more insight in showing the dependence of linearity 
on variations in the series resistor. 
THEORY 
In the following definitions, subscriptsa, 0, and © refer to 
low, medium, and high temperatures respectively (7 oP JE b? and 
T.) within the desired temperature range. Thus 
Ra »R, » and Re = thermistor resistance 
tgqrtp» and toa = current through the bridge (figure B3) 
Bane Sop? and Coe = bridge voltage output 
r = linearizing series resistor 
f, and £, = excitation potentials 
An infinite load across the output was assumed and the 
excitation potentials were assumed to have zero impedance. 
For linear voltage output as a function of temperature, 
octn Coa oD o © oa 
or 
+ -2e .=0 B5 
oc © oa ob 025) 
The outputs, one 7B aie and e we may be written, 
=tr- B6 
2 ag Oe 2 (B6) 
2 (B7) 
€ Opm 7 a oe Ho 
@ Su ros B8 
OGh ire Ge ee) 
Substituting these expressions into eq. (B5), 
tL +2 -27,=0 (B9) 
eC a b 
