By Wouter Bracke, Robert Puers, Chris Van Hoof
This booklet describes extremely low energy capacitive sensor interfaces, and provides the conclusion of a truly low energy everyday sensor interface chip that's adaptable to a large diversity of capacitive sensors. The publication opens via reviewing very important layout points for self reliant sensor platforms, discusses diverse construction blocks, and provides the modular structure for the regular sensor interface chip. eventually, the widespread sensor interface chip is proven in state of the art functions.
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Additional resources for Ultra Low Power Capacitive Sensor Interfaces (Analog Circuits and Signal Processing)
The measured differential non-linearity of the NRZ modulator (10-bit mode). 31. The measured integral non-linearity of the RZ modulator (10-bit mode). A. Bandgap reference and bias system Fig. 33 shows the bandgap reference and bias system. The bandgap reference circuit creates a voltage, which is independent of the power supply voltage and the temperature. The bandgap reference circuit adds a Proportional To Absolute Temperature (PTAT) voltage to the base emittor voltage, Vbe , of the bipolar transistor Q3 .
25 Generic Sensor Interface Chip contribution is due to the offset voltage of the OTA, which creates a leakage charge proportional to Vof f set Gp Tphase2 . The third contribution originates from the finite DC gain Av of the OTA, which in turn leads to a leakage charge proportional to (Vout /Av )Gp Tphase2 . In [Li02], Li et al. use the conventional state-of-the-art C-V converter in combination with a chopping technique and the three-signal autocalibration method. This interface eliminates the offset leakage and compensates for the drift in the readout electronics.
The phase margins of the OTA and the common mode feedback equal 78 deg and 82 deg. The phases Φ3 , Φ4 and Φ5 take 3/8, 5/8 and 2/8 of the clock period. 18. Transient error as a function of the clock cycle, n. 19. Differential folded cascode OTA with SC common mode feedback. where the contribution of the feedback capacitor C1 << Ch , Cl . can be neglected, because CC12+C 2 C2 C1 C1 +C2 in the load capacitor gm The equivalent GBW = 2πC of the OTA equals 160 kHz, which is 20 load times the clock frequency.