Abstract
Standard thick film resistor pastes exhibit changes in their electrical characteristics when printed on top of dielectric layers. Of particular interest is the inherent change in their temperature coefficient of resistance. Simple temperature sensors were formed by deliberately printing thick film resistor pastes on top of larger area dielectric layers. Temperature tests carried out on these devices have shown that by selecting the correct paste combination and resistor aspect ratio stable, repeatable, temperature sensors with good linearity can be manufactured. A comparison is made of these sensors to other commercially available products currently used in the thick film industry.
Highlights
A wide range of components exists for use as sensors in thick film systems. They range from packaged chips, which may be mounted or bonded to the substrate material, through to special temperature sensitive pastes designed with a high temperature coefficient of resistance (TCR)
For instance the unique resistor, A3RDL5, is located in group A, on substrate 3, it is a resistor on a dielectric layer (RDIE), which is longitudinally printed with an aspect ratio of 5
The performances of the standard paste sensors were firstly compared with a special temperature sensitive paste typical of that used in present day thick film technology
Summary
A wide range of components exists for use as sensors in thick film systems They range from packaged chips, which may be mounted or bonded to the substrate material, through to special temperature sensitive pastes designed with a high temperature coefficient of resistance (TCR). If such a paste is printed on to an insulating pastes with a different temperature expansion coefficient, the resulting combination gives rise to a temperature sensor with improved sensitivity. Such sensors are produced using the same pastes as used for other passive components in the circuit and need no special processing steps. A comparison was made with a number of other temperature sensors that are commercially available for use in thick film circuits
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