Design and performance of constant-temperature circuits for microbridge-sensor applications

The performance and transient behavior of constant-temperature microbridge bias circuits are analyzed and measured. This type of circuit enhances the microbridge gas-induced signals with respect to those induced by the substrate temperature. If is found that this type of circuit must be compensated to prevent excessive microbridge overheating. The elimination of temperature overshoot implies a reduction in the circuit bandwidth.<<ETX>>

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