Industrial Technology Research Institute

Richtek Technology Corporation

Lu-Po Liao

Yu-Wen Hsu

Yu-Chun Hsu

Ying-Che Lo

Chia-Yu Wu

Shih-Ting Lin

Chin-Fu Kuo

Yu-Sheng Lin

Chieh-Ling Hsiao

Sheng-Ren Chiu

Liang-Ying Liu

The differential capacitor device includes a differential capacitor sensing component, a calibration capacitor assembly and two output terminals. The differential capacitive sensing element has a common point terminal, a first non-common point terminal and a second non-common point terminal, and the common point terminal is configured to receive an input voltage. The calibration capacitor assembly has a first calibration capacitor and a second calibration capacitor, one terminal of the calibration capacitor assembly is coupled to the first non-common point terminal and the second non-common point terminal, and the other terminal of the calibration capacitor assembly is configured to receive a first calibration voltage and a second calibration voltage. The two output terminals are respectively coupled to the first non-common point terminal and the second non-common point terminal to output a first signal and a second signal.

Differential capacitor device and method for calibrating differential capacitor

This invention provides a signal processing method of multiple micro-electro-mechanical system devices. The signal processing method includes: providing at least two MEMS devices; applying driving or modulating signals of different frequencies to the MEMS devices such that the MEMS devices generate respective MEMS signals with respective frequencies; and combining the MEMS signals with respective frequencies into one or more multi-frequency signals and outputting the multi-frequency signals, wherein a number of the multi-frequency signals is less than a number of the MEMS signals with respective frequencies. This invention also provides a combo MEMS device integrating two or more MEMS devices and two or more vibration sources.

Signal processing method of multiple mirco-electro-mechanical system (MEMS) devices and combo MEMS device applying the method

A reading circuit of a gyroscope is provided. The reading circuit includes a driving unit, a high pass filter, a signal processing unit, and a low pass filter. The driving unit generates a resonance signal for a resonator of the gyroscope and generates a demodulation signal for the signal processing unit. The signal processing unit provides a modulation signal to a Coriolis accelerometer of the gyroscope. An input terminal of the high pass filter receives an output signal of the Coriolis accelerometer. The signal processing unit processes and demodulates an output of the high pass filter according to the demodulation signal and outputs a demodulation result to the low pass filter.

Reading circuit of gyroscope

A calibration apparatus and method for a capacitive sensing device, in which a calibration capacitor device connects to the capacitive sensing device which is connected to an integration circuit that generates a voltage output and a latch output, a transforming circuit transforms a sensitivity calibration parameter into a pair of corresponding analog signal outputs, and an offset calibration parameter into a corresponding analog signal output, at least two first switches between the pair of corresponding analog signal outputs and a fixed potential according to system clock's levels, and at least a third switch switches between the corresponding analog signal output and another fixed potential according to the system clock's levels. The apparatus determines the switch between the pair of signal outputs according to the latch output.

Calibration apparatus and method for capacitive sensing devices

A low frequency analog circuit and a method for designing the same are provided. In a low frequency analog circuit according to the present invention, a part of MOS transistors employed in the circuit are operated at a weak inversion region.

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Taipei, Taiwan

Lu-Po Liao