A Digital Technique Precise Measurement of Capacitor Difference

Inside the thesis we can read description related to bit, noise, self calibration, measurement, offset, sensitivity, channel, calibration, comparator offset, measurements, sensitive node, measurement system design, capacitance change, alternate switching, capacitance, temperature, divider ratio, offset voltage, output voltage, feedback loop, closed loop, and transistor hysteresis. Many info about difference, switch, redistribution technique, node, design, pressure, switching, capacitive pressure, switching sequences, theory, devices, silicon, detection, charge redistribution technique, successive approximation register, plate separation, output, charge injection, integrated circuits, converter, calibration voltage, and equation are explained in this thesis.

This thesis gives you explanation related to open loop topology, time, dielectric constant, voltages, solid state, chip, circuit, digital, reference capacitors, measurement data, technique, parasitic capacitances, measurement cycle, successive approximation, residual polarization, effects, resolution, data, quantization error, reference voltage, comparator, and measurement system. Here are selected from the thesis:

Technique for measurement of capacitor differences has been developed that has ‘ its origins in charge redistribution analog-to-digital converters. Effects of parasitic capacitance and MOS switch charge injection are canceled. The capacitance difference can be obtained as a voltage in both digital and analog form with no additional circuitry needed. This makes it ideally suited for digital signal processing. Since the technique can be made relatively insensitive to parasitic capacitance, differences in small capacitances such as capacitive integrated sensors can be measured. It is shown that measurements on 20 to 100 femtofarad capacitors are possible using this method. Effects of junction leakage, capacitor and transistor hysteresis, comparator offset, MOS switch charge injection, and voltage and temperature coefficients are taken into account.

Furthermore, the thesis gives us more such as conversion, capacitor, voltage, calibration cycle, self calibration technique, capacitive difference measurement, system, offset calibration, cycle, capacitive measurement system, standard deviation, input, calibration technique, overlap capacitance, capacitive measurement, calibration technique theory, sensor, fundamental limitations, parasitic capacitance, capacitive sensor, coupling capacitor, and digital output.

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