Patents by Inventor Kok Siang Tan
Kok Siang Tan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11622428Abstract: A constant current LED driver, for controlling a current flowing through a LED, comprising: an adjusting circuit, configured to generate a first current and a first adjusting signal; a feedback circuit, controlled by an output signal, to generate a feedback voltage according to the first current; an operation amplifier, configured to generate the output signal according to the LED voltage and the feedback voltage; and an edge adjusting circuit, configured to adjust a first type of edges or a second type of edges of the first adjusting signal to generate a second adjusting signal, wherein the LED is controlled by the second adjusting signal. The above-mentioned constant current LED driver can be used as a current control circuit for controlling a current flowing through a target device.Type: GrantFiled: May 19, 2022Date of Patent: April 4, 2023Assignee: PixArt Imaging Inc.Inventor: Kok Siang Tan
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Patent number: 11218138Abstract: A sensing circuit includes: a comparison circuit for comparing an input signal to a corresponding limit threshold; and a control circuit for periodically selecting the limit threshold and sampling a comparison result to execute an interval determination step, thus determining an interval of the input signal. The interval determination step includes steps S100 and S200. Step S100: when the input signal is higher than an ascending upper limit threshold for consecutive plural times, assigning a higher adjacent interval as a following interval; when the input signal is lower than a descending lower limit threshold for consecutive plural times, assigning a lower adjacent interval as a following interval; and executing the interval determination step corresponding to the following interval. Step S200: When no adjacent interval is assigned as the following interval, generating an interval output signal corresponding to the interval and entering the corresponding step S100.Type: GrantFiled: April 15, 2021Date of Patent: January 4, 2022Assignee: PIXART IMAGING (PENANG) SDN. BHD.Inventor: Kok-Siang Tan
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Patent number: 10996700Abstract: A fast response amplifier circuit includes a pre-stage circuit and an output stage circuit. The pre-stage circuit generates a control signal according to a difference between a first input signal and a second input signal. The output stage circuit generates an output signal at an output node according to the control signal. The output stage circuit includes: a power transistor controlled by a driving signal to generate the output signal; a voltage positioning transistor operates according to the output signal to steer a first portion and a second portion of a bias current; an overshoot detecting circuit detecting an overshoot of the output signal to generate an overshoot indicating signal; and a first overshoot suppressor which generates a first overshoot suppressing signal according to the overshoot indicating signal to adjust a conduction resistance of the power transistor to suppress an overshoot of the output signal.Type: GrantFiled: December 7, 2019Date of Patent: May 4, 2021Assignee: PIXART IMAGING INCORPORATIONInventor: Kok-Siang Tan
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Patent number: 10915122Abstract: A bandgap reference circuit including a clamp circuit is provided. The bandgap reference circuit performs the calibration only for one time in a normal mode to store a control code of a reference generator of the clamp circuit. In a suspend mode, the control code is used for controlling the reference generator to cause the clamp circuit to provide a desired source voltage, and a bandgap reference voltage source is shut down to reduce the power consumption.Type: GrantFiled: July 1, 2019Date of Patent: February 9, 2021Assignee: PIXART IMAGING INC.Inventors: Kok-Siang Tan, Wai-Lian Teo
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Patent number: 10831321Abstract: There is provided a parallel sensing touch control device including a capacitive sensor array processed by differential unit. In one detection interval, the device is concurrently conducting more than one sensing electrode of the capacitive sensor array so as to reduce a scanning interval of the capacitive sensor array. The differential unit performs a differential operation on detected signals to cancel out common mode noise.Type: GrantFiled: April 19, 2018Date of Patent: November 10, 2020Assignee: PIXART IMAGING INC.Inventors: Kok-Siang Tan, Yu-Han Chen, Meng-Lin Yu, Kei-Tee Tiew
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Patent number: 10481624Abstract: A bandgap reference circuit including a clamp circuit is provided. The bandgap reference circuit performs the calibration only for one time in a normal mode to store a control code of a reference generator of the clamp circuit. In a suspend mode, the control code is used for controlling the reference generator to cause the clamp circuit to provide a desired source voltage, and a bandgap reference voltage source is shut down to reduce the power consumption.Type: GrantFiled: April 8, 2019Date of Patent: November 19, 2019Assignee: PIXART IMAGING INC.Inventor: Kok-Siang Tan
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Publication number: 20190324483Abstract: A bandgap reference circuit including a clamp circuit is provided. The bandgap reference circuit performs the calibration only for one time in a normal mode to store a control code of a reference generator of the clamp circuit. In a suspend mode, the control code is used for controlling the reference generator to cause the clamp circuit to provide a desired source voltage, and a bandgap reference voltage source is shut down to reduce the power consumption.Type: ApplicationFiled: July 1, 2019Publication date: October 24, 2019Inventors: KOK-SIANG TAN, WAI-LIAN TEO
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Publication number: 20190324572Abstract: There is provided a parallel sensing touch control device including a capacitive sensor array processed by differential unit. In one detection interval, the device is concurrently conducting more than one sensing electrode of the capacitive sensor array so as to reduce a scanning interval of the capacitive sensor array. The differential unit performs a differential operation on detected signals to cancel out common mode noise.Type: ApplicationFiled: April 19, 2018Publication date: October 24, 2019Inventors: Kok-Siang TAN, Yu-Han CHEN, Meng-Lin YU, Kei-Tee TIEW
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Patent number: 10386875Abstract: A bandgap reference circuit including a clamp circuit is provided. The bandgap reference circuit performs the calibration only for one time in a normal mode to store a control code of a reference generator of the clamp circuit. In a suspend mode, the control code is used for controlling the reference generator to cause the clamp circuit to provide a desired source voltage, and a bandgap reference voltage source is shut down to reduce the power consumption.Type: GrantFiled: October 6, 2017Date of Patent: August 20, 2019Assignee: PIXART IMAGING INC.Inventors: Kok-Siang Tan, Wai-Lian Teo
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Publication number: 20190235542Abstract: A bandgap reference circuit including a clamp circuit is provided. The bandgap reference circuit performs the calibration only for one time in a normal mode to store a control code of a reference generator of the clamp circuit. In a suspend mode, the control code is used for controlling the reference generator to cause the clamp circuit to provide a desired source voltage, and a bandgap reference voltage source is shut down to reduce the power consumption.Type: ApplicationFiled: April 8, 2019Publication date: August 1, 2019Inventor: KOK-SIANG TAN
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Patent number: 10365756Abstract: A hybrid transmitter driver works in a first operation mode or a second operation mode and includes an operational amplifier, a pre-driver, a first multiplexer, a second multiplexer and an output stage driver. After receiving a signal from the first signal generator, the operational amplifier outputs a first driving signal and a third driving signal. After receiving a signal from the second signal generator, the pre-driver outputs a second driving signal and a fourth driving signal. In the first operation mode, the first multiplexer outputs the second driving signal and the second multiplexer outputs the fourth driving signal to make the output stage driver output a first transmission signal. In the second operation mode, the first multiplexer outputs the first driving signal and the second multiplexer outputs the third driving signal to make the output stage driver output a second transmission signal.Type: GrantFiled: June 14, 2017Date of Patent: July 30, 2019Assignee: PIXART IMAGING INC.Inventors: Kok-Siang Tan, Kei-Tee Tiew
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Patent number: 10296027Abstract: A bandgap reference circuit including a clamp circuit is provided. The bandgap reference circuit performs the calibration only for one time in a normal mode to store a control code of a reference generator of the clamp circuit. In a suspend mode, the control code is used for controlling the reference generator to cause the clamp circuit to provide a desired source voltage, and a bandgap reference voltage source is shut down to reduce the power consumption.Type: GrantFiled: April 18, 2018Date of Patent: May 21, 2019Assignee: PIXART IMAGING INC.Inventor: Kok-Siang Tan
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Publication number: 20180364852Abstract: A hybrid transmitter driver works in a first operation mode or a second operation mode and includes an operational amplifier, a pre-driver, a first multiplexer, a second multiplexer and an output stage driver. After receiving a signal from the first signal generator, the operational amplifier outputs a first driving signal and a third driving signal. After receiving a signal from the second signal generator, the pre-driver outputs a second driving signal and a fourth driving signal. In the first operation mode, the first multiplexer outputs the second driving signal and the second multiplexer outputs the fourth driving signal to make the output stage driver output a first transmission signal. In the second operation mode, the first multiplexer outputs the first driving signal and the second multiplexer outputs the third driving signal to make the output stage driver output a second transmission signal.Type: ApplicationFiled: June 14, 2017Publication date: December 20, 2018Inventors: KOK-SIANG TAN, KEI-TEE TIEW
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Publication number: 20180314280Abstract: A bandgap reference circuit including a clamp circuit is provided. The bandgap reference circuit performs the calibration only for one time in a normal mode to store a control code of a reference generator of the clamp circuit. In a suspend mode, the control code is used for controlling the reference generator to cause the clamp circuit to provide a desired source voltage, and a bandgap reference voltage source is shut down to reduce the power consumption.Type: ApplicationFiled: April 18, 2018Publication date: November 1, 2018Inventor: KOK-SIANG TAN
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Publication number: 20180314282Abstract: A bandgap reference circuit including a clamp circuit is provided. The bandgap reference circuit performs the calibration only for one time in a normal mode to store a control code of a reference generator of the clamp circuit. In a suspend mode, the control code is used for controlling the reference generator to cause the clamp circuit to provide a desired source voltage, and a bandgap reference voltage source is shut down to reduce the power consumption.Type: ApplicationFiled: October 6, 2017Publication date: November 1, 2018Inventors: Kok-Siang TAN, Wai-Lian TEO
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Patent number: 10020029Abstract: The present invention provides a voltage scaling-up circuit which comprises a charge pump circuit and a multiplexer circuit. The charge pump circuit which includes at least one pumping switch, and is configured to operably periodically converts an input voltage to a pumped voltage onto a pump output node through the at least one pumping switch by charging and pumping, such that the pumped voltage has a scaling factor over the input voltage, wherein the at least one pumping switch has a bulk. The multiplexer circuit senses a predetermined voltage and the pumped voltage and selects one of the predetermined voltage and the pumped voltage which has a higher magnitude as a scaled output voltage at a scaled output node; wherein the bulk of the at least one pumping switch is biased to the scaled output voltage.Type: GrantFiled: April 3, 2017Date of Patent: July 10, 2018Assignee: PixArt Imaging (Penang) SDN. BHD.Inventor: Kok-Siang Tan
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Patent number: 9977442Abstract: A bandgap reference circuit including a clamp circuit is provided. The bandgap reference circuit performs the calibration only for one time in a normal mode to store a control code of a reference generator of the clamp circuit. In a suspend mode, the control code is used for controlling the reference generator to cause the clamp circuit to provide a desired source voltage, and a bandgap reference voltage source is shut down to reduce the power consumption.Type: GrantFiled: April 27, 2017Date of Patent: May 22, 2018Assignee: PIXART IMAGING INC.Inventor: Kok-Siang Tan
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Publication number: 20170237433Abstract: A driver circuit drives data to an output based on an input data signal in a transmission mode. The driver circuit includes transistors. A comparator generates a comparison output in a calibration mode based on a reference signal and a signal at the output of the driver circuit. A calibration control circuit adjusts an equivalent resistance of the transistors in the driver circuit based on the comparison output in the calibration mode. The equivalent resistance of the transistors in the driver circuit can be adjusted to support the transmission of data according to multiple different data transmission protocols using transmission links having different characteristic impedances. The equivalent resistance of the transistors in the driver circuit can also be adjusted to compensate for resistance in the package routing conductors and/or to compensate for parasitic resistance.Type: ApplicationFiled: May 1, 2017Publication date: August 17, 2017Applicant: Altera CorporationInventors: Kok Siang Tan, Tim Tri Hoang
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Patent number: 9680469Abstract: A driver circuit drives data to an output based on an input data signal in a transmission mode. The driver circuit includes transistors. A comparator generates a comparison output in a calibration mode based on a reference signal and a signal at the output of the driver circuit. A calibration control circuit adjusts an equivalent resistance of the transistors in the driver circuit based on the comparison output in the calibration mode. The equivalent resistance of the transistors in the driver circuit can be adjusted to support the transmission of data according to multiple different data transmission protocols using transmission links having different characteristic impedances. The equivalent resistance of the transistors in the driver circuit can also be adjusted to compensate for resistance in the package routing conductors and/or to compensate for parasitic resistance.Type: GrantFiled: May 16, 2016Date of Patent: June 13, 2017Assignee: Altera CorporationInventors: Kok Siang Tan, Tim Tri Hoang
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Patent number: 9369128Abstract: A driver circuit drives data to an output based on an input data signal in a transmission mode. The driver circuit includes transistors. A comparator generates a comparison output in a calibration mode based on a reference signal and a signal at the output of the driver circuit. A calibration control circuit adjusts an equivalent resistance of the transistors in the driver circuit based on the comparison output in the calibration mode. The equivalent resistance of the transistors in the driver circuit can be adjusted to support the transmission of data according to multiple different data transmission protocols using transmission links having different characteristic impedances. The equivalent resistance of the transistors in the driver circuit can also be adjusted to compensate for resistance in the package routing conductors and/or to compensate for parasitic resistance.Type: GrantFiled: August 15, 2014Date of Patent: June 14, 2016Assignee: Altera CorporationInventors: Kok Siang Tan, Tim Tri Hoang