SENSOR CIRCUIT FOR ENERGY-EFFICIENTLY INTEGRATING MULTIPLE STANDARD CMOS SENSORS, AND SENSOR DEVICE INCLUDING SAME

摘要

Presented are an environment information sensor circuit and an environment information measurement device which can sense various kinds of environment information, such as pressure, humidity, and acceleration, and simply reduce quantization noise by employing a dual quantization capacitance-to-digital converter structure. The presented environment information sensor circuit comprises: a switched capacitor which outputs one among pressure information, humidity information, and acceleration information on the basis of a first clock signal and a second clock signal that do not overlap; a single-bit first order delta-sigma converter that includes an integrator which integrates the output from the switched capacitor and outputs the integrated output as an analog value, and a single-bit quantizer which compares the output from the integrator and a preset threshold voltage and outputs a single-bit digital signal corresponding to the comparison resu and a multi-bit quantizer connected to an output end of the integrator via a sampling switch, and quantizes the output from the integrator at the moment the sampling switch is turned on according to a sampling signal.