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Voltage comparators have been widely used in low-power sensor wake-up circuits for extracting digital bits from the envelope of received RF signals. This paper presents an alternative circuit to such comparators. The proposed circuit extracts digital bits by detecting the falling edge of the envelope signal. Since it essentially compares the values of the same signal at different times, it is potentially...
Many low-power successive approximation register analog-to-digital converters (ADCs) use separate small capacitors, instead of the entire charge scaling (CS) capacitor arrays, to sample the analog inputs. While reducing power consumption, it makes these ADCs prone to gain errors and input range reduction caused by parasitic capacitance of the CS array. This paper presents an effective technique with...
Electrical conductivity is one of the necessary parameters of water quality detection in the seawater desalination. By analyzing the shortcomings of traditional measurement methods, an electrical conductivity measurement method based on the variable frequency excitation was proposed. The factors affecting measurement error such as temperature, electrode polarization and capacitance effect were analyzed...
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