Patents Assigned to Advanced Analog Technology, Inc
  • Patent number: 10571995
    Abstract: A power-saving scanning method for a touch device is provided. Firstly, a controller is used to shorten a normal scanning time of a timer into a power-saving scanning time. Then, a counter is used to count the oscillating waveform within the power-saving scanning time to access a power-saving oscillating number. Afterward, the controller is used to convert the power-saving oscillating number into an (L-n)-digit M-bit count value, shift the (L-n)-digit M-bit count value toward the higher digit by n digits, and pad the lower digits with n zeros to form another L-digit M-bit count value so as to generate an M-bit oscillating number simulation value for the determination of touch operation.
    Type: Grant
    Filed: January 8, 2019
    Date of Patent: February 25, 2020
    Assignee: ADVANCED ANALOG TECHNOLOGY, INC.
    Inventor: Kun-Hsu Lee
  • Patent number: 10234993
    Abstract: A touch system includes a circuit board, touch pads, a control chip and an insulation board. The circuit board has a conductive board body including configuration regions. The touch pads is spaced from the configuration regions by the conductive board body. Each touch pad includes at least one touch portion. The control chip includes a multiplex module coupling the touch pads and an oscillation control module coupling the conductive board body. The oscillation control module conducts alternately the multiplex module and every touch portions to utilize a work voltage for generating a voltage oscillation wave respective to each conducted touch portion. The voltage oscillation wave is transmitted to the conductive board body. When an ion-contained liquid is on the insulation board by covering partly the conductive board body and the touch portion, a capacitance effect therebetween is forming by the work voltage, but further erased by the voltage oscillation wave.
    Type: Grant
    Filed: April 17, 2017
    Date of Patent: March 19, 2019
    Assignee: ADVANCED ANALOG TECHNOLOGY, INC.
    Inventor: Kun-Hsu Lee
  • Patent number: 10175821
    Abstract: A touch calibration system and method thereof are provided in the present invention. When a touch pad stops receiving a touch signal generated from a user to make the touch calibration system be at a calibration mode, a first step of the touch calibration method is providing a fixed count value to a counter of the touch calibration system. A second step is provided that a wave-generation module generates an oscillation wave, a counter counts an oscillation number corresponding to the oscillation wave, and a timer counts a calibration oscillation time. A third step is provided that determining whether the oscillation number achieves the fixed count value. When the oscillation number achieves the fixed count value, a storage module is received the calibration oscillation time to store the calibration oscillation time.
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: January 8, 2019
    Assignee: ADVANCED ANALOG TECHNOLOGY, INC.
    Inventor: Kun-Hsu Lee
  • Patent number: 9337158
    Abstract: An integrated circuit (IC) device includes an IC and an electrostatic discharge (ESD) protection device. The IC has a substrate, a core and a power mesh. The power mesh has a power electrode, a grounding electrode and a seal ring. The core is formed inside the grounding electrode. The power electrode is formed between the seal ring and the grounding electrode. The ESD protection device has multiple switch triggering units, multiple switching units and multiple discharging units formed on the substrate and electrically connected between the power electrode and the grounding electrode. The switching units turn on corresponding discharging units upon detecting occurrence of ESD to guide static electricity on the power electrode to the grounding electrode, thereby preventing the core from being damaged by static electricity.
    Type: Grant
    Filed: March 6, 2015
    Date of Patent: May 10, 2016
    Assignee: Advanced Analog Technology, Inc.
    Inventor: Shuo-Yen Lin
  • Patent number: 9306462
    Abstract: A constant current control circuit includes a sample and hold unit coupled to a current sensing resistor of a power converter, for storing a current sensing voltage of the current sensing resistor; a first capacitor for storing a comparison voltage; a discharge unit coupled between the sample and hold unit and the first capacitor, for controlling a discharge current of the first capacitor according to a reference voltage and the current sensing voltage stored in the sample and hold unit; a charge unit coupled to the first capacitor, for controlling a charging current of the first capacitor according to the reference voltage and a ground voltage; and a comparator for comparing the comparison voltage with the reference voltage to generate a comparison result, and outputting a control signal according to the comparison result, in order to control a duty cycle of the power converter.
    Type: Grant
    Filed: July 4, 2014
    Date of Patent: April 5, 2016
    Assignee: Advanced Analog Technology, Inc.
    Inventor: Yeu-Torng Yau
  • Patent number: 9293424
    Abstract: A semiconductor structure is arranged on an integrated circuit, the integrated circuit includes a seal ring arranged at outer periphery of the integrated circuit, a metal ring arranged at an inner side of the seal ring and a power bus arranged at a side of the metal ring. The semiconductor structure includes a first P type electrode area, a second P type electrode area and a first N type electrode area. The first P type electrode area is formed at a position on a P well corresponding to the seal ring, and coupled to the seal ring. The second P type electrode area is formed at a position on the P well corresponding to the metal ring, and coupled to the metal ring. The first N type electrode area is formed at a position corresponding to the power bus, and coupled to the power bus.
    Type: Grant
    Filed: October 12, 2014
    Date of Patent: March 22, 2016
    Assignee: Advanced Analog Technology, Inc.
    Inventors: Chun-Chung Ko, Chih-Lun Wu, Shuo-Yen Lin
  • Patent number: 9202807
    Abstract: A semiconductor structure includes a P well formed on a P type substrate; a first N type electrode area formed on a central region of the P well; a first insulating area formed on the P well and surrounding the first N type electrode area; a second N type electrode area formed on the P well and surrounding the first insulating area; a second insulating area formed on the P well and surrounding the second N type electrode area; and a P type electrode area formed on the P well and surrounding the second insulating area; wherein periphery outlines of the first N type electrode area and the second N type electrode area are both 8K sided polygons or circles, and K is a positive integer.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: December 1, 2015
    Assignee: Advanced Analog Technology, Inc.
    Inventors: Chun-Chung Ko, Chih-Lun Wu, Shuo-Yen Lin
  • Patent number: 8274268
    Abstract: A control circuit comprises a PWM control circuit and a PWM skip control circuit. The PWM control circuit controls a switching circuit. The switching circuit acts as a current source for an output circuit and a load circuit. The PWM skip control circuit controls the operation of the PWM control circuit. When the output current of the switching circuit is below a predetermined threshold, the PWM skip control circuit stops the operation of the PWM control circuit. When the output voltage of the switching circuit is below a predetermined threshold, the PWM skip control circuit resumes the operation of the PWM control circuit.
    Type: Grant
    Filed: August 13, 2008
    Date of Patent: September 25, 2012
    Assignee: Advanced Analog Technology, Inc.
    Inventor: Chih Yueh Yen
  • Publication number: 20120153859
    Abstract: A driving circuit for driving light emitting diodes includes a signal-extending circuit and a current sink. The signal-extending circuit is used for receiving an original dimming signal and extending a duty cycle of the original dimming signal. The current sink is coupled to the signal-extending circuit for generating a driving current for driving a series of light emitting diode.
    Type: Application
    Filed: December 16, 2010
    Publication date: June 21, 2012
    Applicant: ADVANCED ANALOG TECHNOLOGY, INC.
    Inventors: Chih-Hung Wu, Yung-Chun Chuang, Chu-Rung Lee
  • Patent number: 8129965
    Abstract: A low dropout regulator includes an error amplifier, an N-type depletion MOSFET, a first switch, a second switch, a low-pass filter resistor, and a low-pass filter capacitor. By switching on both the first switch and the second switch, a voltage level of an output node at a negative input terminal of the error amplifier may be rapidly raised to be close to and lower than a voltage level of an input node at a gate of the N-type depletion MOSFET. Both the first switch and the second switch are then switched off immediately so that the voltage level of the output node is gradually raised to be equal to the voltage level of the input node through the low-pass filter resistor.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: March 6, 2012
    Assignee: Advanced Analog Technology, Inc.
    Inventors: Shun-Hau Kao, Mao-Chuan Chien, Chih-Liang Huang
  • Patent number: 8026705
    Abstract: A bootstrap circuit is utilized in a bulk circuit using an NMOS transistor as a power switch. The bootstrap circuit includes a first PMOS transistor coupled between an internal power source and an offset capacitor, and a second PMOS transistor coupled between the gate of the first PMOS transistor and the offset capacitor, and an NMOS transistor coupled between the gate of the first PMOS transistor and ground. When the power switch is turned on, the second PMOS transistor is turned on for turning off the first PMOS transistor. When the power switch is turned off, the NMOS transistor is turned on for turning on the first PMOS transistor.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: September 27, 2011
    Assignee: Advanced Analog Technology, Inc.
    Inventors: Li-Chieh Chen, Yu-Min Sun, Yu-Lee Yeh
  • Patent number: 7906945
    Abstract: A soft-start voltage circuit includes an operational amplifier, a first and a second capacitors, a first and a second switches, and a voltage level shifter. The operational amplifier includes a positive end, a negative end, and an output end coupled to the negative end of the operational amplifier for outputting the soft-start voltage. The voltage level shifter is coupled between the first capacitor and the positive end of the operational amplifier for shifting a level of the voltage on the first capacitor. The first switch is coupled between the first and the second capacitors for coupling the first and the second capacitors according to the clock. The second switch is coupled between the second capacitor and the negative end of the operational amplifier for coupling the second capacitor and the negative end of the operational amplifier according to the inverted clock.
    Type: Grant
    Filed: November 17, 2008
    Date of Patent: March 15, 2011
    Assignee: Advanced Analog Technology, Inc.
    Inventors: Shun-Hau Kao, Mao-Chuan Chien
  • Patent number: 7893679
    Abstract: A PWM comprises a voltage transformation module, a voltage-sensing module and a timer. The voltage transformation module is configured to transform an input voltage into an output voltage. The voltage-sensing module is coupled to the voltage transformation module and configured to detect a voltage of a first terminal, wherein the voltage of the first terminal is proportional to the output voltage. The timer is configured to measure the time duration for which the voltage of the first terminal is lower than a reference voltage, wherein the timer initiates a short circuit signal when the time duration is greater than a predetermined value.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: February 22, 2011
    Assignee: Advanced Analog Technology, Inc.
    Inventors: Chien Peng Yu, Yi Cheng Wang, Ye Hsuan Yan, Chih Chi Hsu
  • Patent number: 7852054
    Abstract: An over current protection circuit for low dropout regulator comprises a sense transistor, a sense resistor, an operational amplifier and a first transistor. The sense transistor senses the current flowing through the power transistor. The sense resistor is coupled to the sense transistor and shares the same current flowing through the sense transistor. The operational amplifier outputs a control signal according to the voltage across the sense resistor and a reference voltage. The first transistor controls the power transistor according to the control signal.
    Type: Grant
    Filed: September 23, 2008
    Date of Patent: December 14, 2010
    Assignee: Advanced Analog Technology, Inc.
    Inventors: Shun Hau Kao, Mao Chuan Chien
  • Patent number: 7812668
    Abstract: A multi-input operational amplifier comprises two transconductors, two current mirrors, and a current source. Each transconductor generates a current according to a corresponding voltage difference. When the voltage difference is less than or equal to zero, the current is a constant. When the voltage difference exceeds zero, the current is proportional to the voltage difference.
    Type: Grant
    Filed: September 23, 2008
    Date of Patent: October 12, 2010
    Assignee: Advanced Analog Technology, Inc.
    Inventor: Yung Ching Chang
  • Patent number: 7804360
    Abstract: The dead-time locking circuit includes phase detector and a delay-comparator. The delay-comparator includes two input ends for receiving phase adjusting signal and the input-exchanging signal received by the class D amplifier. After comparing, the delay-comparator outputs a gate driving signal. The phase detector detects the phase difference between the output signal of the class D amplifier and the gate driving signal of the power transistor of the class D amplifier, and accordingly adjusts the rising/falling edges of the gate driving signal outputted from and the comparator via the charge-pump. In this way, the dead-time can be locked at the predetermined value.
    Type: Grant
    Filed: December 1, 2008
    Date of Patent: September 28, 2010
    Assignee: Advanced Analog Technology, Inc.
    Inventor: Chien-Hao Chiu
  • Patent number: 7741820
    Abstract: A PWM controller for controlling a switching voltage regulator comprises a first comparator, a second comparator and a third comparator. The first comparator is configured to detect voltages of a first node and a second node so as to determine whether to stop the PWM controller. The PWM controller is stopped if a first potential is lower than a threshold, and the first potential derives from the voltage of the first node by a level shift of a first voltage difference. The second comparator is configured to detect the voltage of the first node and then to compare the voltage with a power reference voltage so as to determine whether the PWM controller receives necessary power. The third comparator is configured to compare the voltage of the second node with an enable reference voltage so as to determine whether to disable the PWN controller.
    Type: Grant
    Filed: September 2, 2008
    Date of Patent: June 22, 2010
    Assignee: Advanced Analog Technology, Inc.
    Inventors: Hsiang Lin Huang, Kent Huang, Mao Chuan Chien, Shun Hau Kao
  • Patent number: 7733158
    Abstract: A trim fuse circuit includes a metal fuse, a trim pad coupled to the first end of the metal fuse, a first transistor coupled to the first end of the metal fuse, a second transistor coupled to the second end of the metal fuse, an inverter coupled to the second end of the metal fuse, a switch coupled to the second end of the metal fuse, and a common trim pad coupled to the control end of the switch. The inverter outputs a data signal according to the status of the metal fuse. The trim pad can be disposed on the scribe line of a wafer. When the trim pad is cut and accordingly connects to the substrate of the wafer, the data signal is not affected.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: June 8, 2010
    Assignee: Advanced Analog Technology, Inc.
    Inventors: Chao-Hsing Huang, Chun-Liang Yeh
  • Patent number: 7705569
    Abstract: A slope rate compensation circuit includes a source follower level-shift amplifier, a capacitor, a first resistor and a second resistor. The source follower level-shift amplifier includes a first transistor and a second transistor. The first transistor allows a first current to flow therein, the second transistor allows a second current to flow therein, and the first current increases with the second current. The capacitor is connected to the source terminal of the first transistor. The first resistor is connected to the source terminal of the second transistor. The second resistor allows a third current to flow therein, and the third current increases with the second current. The second resistor is related to the output voltage of the slope rate compensation circuit.
    Type: Grant
    Filed: July 24, 2008
    Date of Patent: April 27, 2010
    Assignee: Advanced Analog Technology, Inc.
    Inventor: Chih Yueh Yen
  • Patent number: 7680238
    Abstract: A frequency divider circuit comprises a plurality of T flip-flops, a first transmission gate, a second transmission gate and an inverter. The plurality of T flip-flops is connected in series. The output of the inverter is connected to a clock input of a first T flip-flop. The first transmission gate connects a clock signal and the other clock input of the first T flip-flop and the input of the inverter. The second transmission gate connects the inverted signal of the clock signal and the output of the first transmission gate.
    Type: Grant
    Filed: July 24, 2008
    Date of Patent: March 16, 2010
    Assignee: Advanced Analog Technology, Inc.
    Inventor: Heng Li Lin