F. Response Dependence on Measurement Frequency
All previous measurements have been performed at a frequency
of 1 MHz at the nominal measurement frequency of the
Capacitance Meter (HP4280A). In order to determine the dependence
of the response of the sensor on the frequency at which
device capacitance is measured, a 660-Å-thick device has been
tested at three test frequencies (i.e., 1.1 KHz, 10 KHz and 100
KHz), and the results are illustrated in Fig. 11. Note that the response
at each frequency is linear, and the capacitance decreases
with increasing frequency. At 45% RH, the capacitance is 5.6%
lower at 100 KHz than at 1.1 KHz. These tests are conducted
to show that the sensor output is linear independent of the measurement
frequency and one can utilize lower frequencies than
1 MHz if needed.
F. Response Dependence on Measurement FrequencyAll previous measurements have been performed at a frequencyof 1 MHz at the nominal measurement frequency of theCapacitance Meter (HP4280A). In order to determine the dependenceof the response of the sensor on the frequency at whichdevice capacitance is measured, a 660-Å-thick device has beentested at three test frequencies (i.e., 1.1 KHz, 10 KHz and 100KHz), and the results are illustrated in Fig. 11. Note that the responseat each frequency is linear, and the capacitance decreaseswith increasing frequency. At 45% RH, the capacitance is 5.6%lower at 100 KHz than at 1.1 KHz. These tests are conductedto show that the sensor output is linear independent of the measurementfrequency and one can utilize lower frequencies than1 MHz if needed.
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