Dyna Image Corporation

Shih-Hao Lan

Sheng-Cheng Lee

Wen-Sheng Lin

Disclosures of the present invention particularly describe oscillator circuit with temperature compensation function, consisting of a fully differential amplifier, a current mirror unit, a bias current supplying unit, a compensation unit, and a reference signal generating unit. A variety of experimental data have proved that, based on the normal operation of the compensation unit and the reference signal generating unit, an oscillation frequency of this oscillator circuit would be maintained at same level even if the ambient temperature continuously increases. Therefore, because the frequency drift due to temperature variation would not occur in the oscillator circuit of the present invention, the novel oscillator circuit is potential oscillator to replace the conventional oscillators applied in analog-to-digital convertors or time-to-digital convertors.

Oscillator circuit with temperature compensation function

Differing from conventional optical sensing device used in smart phones often lacks self-calibration function, a novel proximity sensing device having self-calibration function is disclosed by the present invention, and comprises: a driving module, a lighting element, a first a light receiving module, a conversion module, a judge circuit, a synchronous sequential module, an analog front-end module, and an analog-to-digital convertor. When executing a noise calibration process, a sensing signal outputted from the first light receiving module is converted to a voltage signal by the conversion signal comprising a signal-amplifying MOSFET, a current mirror circuit, N number of cascode MOSFET pairs, and a current-to-voltage converting resistor. After that, the voltage is transmitted to the judge circuit, and then the noise calibration process would be completed under the cooperation of the judge circuit, the synchronous sequential module, and the analog front-end module.

Proximity sensing device and optical sensing circuit having proximity sensing function

Differing from conventional ambient light sensors at least having drawbacks of huge circuit area and high manufacturing cost, the present invention discloses an ambient light sensor showing advantages of small circuit area and low manufacturing cost. This ambient light sensor has functionality of photodiode leakage current compensation, and comprises: a temperature sensing unit, a microprocessor unit, a conversion unit, and a lookup table unit. The microprocessor unit is configured to find out a reference parameter for a first dark current from the lookup table unit according to a measured data of ambient temperature. Subsequently, the conversion unit is controlled to apply a current amplifying process to a second dark current. Therefore, after subtracting an output current of the first photodiode from the second dark current been treated with the current amplifying process, the output current been treated with a leakage current compensating process is produced and outputted.

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Taipei, Taiwan

Shih-Hao Lan