Circuit responses: at the top, the period is almost the same, below it, the duty cycle depends linearly on the value of C1

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Other Materials from the Main Document

• Article «Simple circuit interfaces differential capacitance sensor»
• Figure 1. The sensor becomes part of a relaxation oscillator where one of the capacitors is charging when the other one is shorted; the two capacitors periodically swap their operation
• Figure 2. Sensor operation is simulated with a bank of 10 capacitors
• Figure 3. Circuit responses: at the top, the period is almost the same, below it, the duty cycle depends linearly on the value of C1
• Figure 4. The duty cycle response has a nonlinearity error of ±0.3 %