Sensing devices and electronic apparatuses using the same
First Claim
1. A sensing device for sensing light and generating a sensing output signal indicating intensity of the light, comprisinga photo element for sensing the light and generating a current signal at a first node;
- a comparison circuit, coupled to the first node, for receiving the current signal, wherein the comparison circuit comprises a filter for filtering a high-frequency component on the current signal, and the comparison circuit generates a result signal according to the filtered current signal;
a logic circuit for receiving the result signal and performing a logic operation to the result signal to generate the sensing output signal;
a reset capacitor having a first terminal receiving a reset signal and a second terminal coupled to the first node, wherein when the sensing device is sensing the light, the reset signal is asserted; and
a feedback capacitor coupled between the logic circuit and the first node, wherein the reset capacitor and the feedback capacitor have large capacitances.
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Accused Products
Abstract
A sensing device is provided to sense light and generates a sensing output signal indicating intensity of the light. The sensing device includes a photo element, a comparison circuit, and a logic circuit. The photo element senses the light and generates a current signal at a first node. The comparison circuit is coupled to the first node and receives the current signal. The comparison circuit includes a filter for filtering a high-frequency component on the current signal, and the comparison circuit generates a result signal according to the filtered current signal. The logic circuit receives the result signal and performs a logic operation to the result signal to generate the sensing output signal.
18 Citations
18 Claims
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1. A sensing device for sensing light and generating a sensing output signal indicating intensity of the light, comprising
a photo element for sensing the light and generating a current signal at a first node; -
a comparison circuit, coupled to the first node, for receiving the current signal, wherein the comparison circuit comprises a filter for filtering a high-frequency component on the current signal, and the comparison circuit generates a result signal according to the filtered current signal; a logic circuit for receiving the result signal and performing a logic operation to the result signal to generate the sensing output signal; a reset capacitor having a first terminal receiving a reset signal and a second terminal coupled to the first node, wherein when the sensing device is sensing the light, the reset signal is asserted; and a feedback capacitor coupled between the logic circuit and the first node, wherein the reset capacitor and the feedback capacitor have large capacitances. - View Dependent Claims (2, 3, 4, 5, 6, 7, 17, 18)
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8. A sensing device for sensing light and generating a sensing output signal indicating intensity of the light, comprising
a photo element for sensing the light and generating a current signal at a first node; -
a comparison circuit, coupled to the first node, for receiving the current signal and generating a result signal according to the current signal, wherein the comparison circuit has a low gain; a logic circuit for receiving the result signal and performing a logic operation to the result signal to generate the sensing output signal; a reset capacitor having a first terminal receiving a reset signal and a second terminal coupled to the first node, wherein when the sensing device is sensing the light, the reset signal is asserted; and a feedback capacitor coupled between the logic circuit and the first node. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification