Electrial Characterization

A microcontroller board for sensor read-out was developed in collaboration with AppliedSensor (Reutlingen, Germany). This board provides the power supply and the necessary reference voltages and currents to the sensor chip. The sensor chip is mounted on a socket and connected to the microcontroller. The microcontroller provides a set of commands for programming and reading the on-chip registers, controller parameters and sensor values. The microcontroller also manages the data transfer between the f C interface of the microchip and a serial RS-232 interface for external read-out via a PC. The data stream is continuously read out in the measurement mode. Each data set contains the temperature of the microhotplate, the chip 

The microcontroller board, which is connected to an RS-232 interface of a PC, and a 5.5 V power supply, is all that is needed to control and operate the sensor system. 

The performance of the digital temperature controller in the stabilization mode is shown in Fig. 5.10. The ambient temperature was ramped from -10 °C to 90 °C in steps of 10 °C. A reference-temperature digital code of 500 was programmed, which produced a microhotplate temperature of 250 °C. The microhotplate temperature fluctuations owing to ambient temperature variations are less than 2 °C. 

Such slight chip temperature increases do definitely not affect the on-chip circuitry, which is qualified for temperatures between -40 °C and 80 °C. Chip heating 

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The methods to fabricate and characterize nanogap were demonstrated. Two chrome masks are used to fabricate this micro-gap, where polysilicon material is used to pattern the gap. The electrieal characterizations in this research were done by using Semiconductor Parameter Analyzer (SPA), Spectrum Analyzer, IV-CV Station for electrical characteristic. Conductivity, resistivity and capacitance tests are performed to... 

Dani, A. Ogale, A. A. Electrieal percolation behavior of short-fiber composites experimental characterization and modeling. Comp. Sci. Tech. 1996, 56, 911-920. 

By replacing p by yro, the definition of is changed from time domain (inverse Laplace transform) to frequency domain (Fourier transform). One then characterizes the electrieal system by a representation in the Bode diagram of the modulus of the transfer function cf. Figure 3) ... 

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