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| Number | Title | Issue Date |
| 8410797 | Capacitive sensor and sensing method A capacitive sensing method is provided. The capacitive sensing method includes the step of alternately charging/discharging a capacitive sensing electrode of a capacitive sensor for predetermined times under an active mode and charging/discharging the capacitive se... | 04/02/2013 |
| 8368408 | Measuring a time period A time period of an event is determined by charging a known value capacitor from a constant current source during the event. The resultant voltage on the capacitor is proportional to the event time period and may be calculated from the resultant voltage and known ca... | 02/05/2013 |
| 8368409 | Capacitance measurement system and method A capacitance measurement system precharges first terminals (21-0 . . . 21-k . . . 21-n) of a plurality of capacitors (25-0 . . . 25-k . . . 25), respectively, of a CDAC (capacitor digital-to-analog conv... | 02/05/2013 |
| 8339148 | Multi-channel capacitive sensing circuit Provided is a multi-channel capacitive sensing circuit, in which at least one capacitive sensor has the capacitance changed corresponding to the change of external environment, and generates change signals corresponding to the capacitance change, respectively. An os... | 12/25/2012 |
| 8258798 | On chip duty cycle measurement module A method and a circuit for measuring an on chip duty cycle. The circuit includes a capacitor, a switching circuit, a current source, a comparator circuit and a counter. The circuit receives a first clock signal and a second clock signal. The first clock signal has a... | 09/04/2012 |
| 8228076 | Deconvolution-based capacitive touch detection circuit and method A capacitance measuring system includes analog-digital circuitry (15) coupled to row conductors (2i) and column conductors (3i) of a touch screen panel (13A) for producing a first digital signal (DATA) representative of cros... | 07/24/2012 |
| 8217666 | Capacitance detection apparatus Provided is a capacitance detection apparatus capable of effectively discriminating between an external factor due to e.g. water drops and a human-induced operation and allowing detection of occurrence of the human-induced operation with a simple arrangement. The ap... | 07/10/2012 |
| 8183875 | System and method for determining touch positions based on passively-induced position-dependent electrical charges Systems and methods determine the position of a touch on a surface of a device, such as a touch-sensitive device, by using passively-induced position-dependent electrical charges. In such a method, the position of a touching implement is determined on the sensing su... | 05/22/2012 |
| 8174273 | Capacitance measurement circuit with dynamic feedback Methods, devices, and systems that measure capacitance are disclosed. Typically, an accumulator circuit couples to the capacitance and includes an accumulator and switch(es) that charge the accumulator over a series of switch-controlled charging or discharging cycle... | 05/08/2012 |
| 8164351 | Test apparatus Provided is a test apparatus that tests a device under test, including a power supply that generates supply power supplied to the device under test, a transmission path that transmits the supply power generated by the power supply to the device under test, an interm... | 04/24/2012 |
| 8089288 | Charge accumulation capacitance sensor with linear transfer characteristic A method and apparatus for capacitance sensing uses an offset feedback voltage to linearize a charge-transfer characteristic. ... | 01/03/2012 |
| 8089289 | Capacitive field sensor with sigma-delta modulator A capacitive sensor includes a switching capacitor circuit, a comparator, and a charge dissipation circuit. The switching capacitor circuit reciprocally couples a sensing capacitor in series with a modulation capacitor during a first switching phase and discharges t... | 01/03/2012 |
| 8067948 | Input/output multiplexer bus An input/output (“I/O”) system includes a plurality of input/output (“I/O”) ports, measurement circuitry, and an I/O multiplexer bus. The measurement circuitry is coupled to measure one or more electrical properties of one or more devices to be externally co... | 11/29/2011 |
| 8040143 | Capacitance sensing with mismatch compensation Systems and methods are provided for determining the value of a capacitance. A system for sensing capacitance comprises an oscillator arrangement comprising a plurality of oscillators and a mismatch compensation arrangement coupled between the oscillator arrangement... | 10/18/2011 |
| 8035401 | Self-calibrating driver for charging a capacitive load to a desired voltage A self-calibration system includes a variable current source to generate a default source current for charging a capacitive load, and a load charge calibrator to detect a voltage associated with the capacitive load when charged by the default source current, and to ... | 10/11/2011 |
| 8018238 | Embedded sar based active gain capacitance measurement system and method A system for measuring a capacitor (CSENj) precharges a CDAC (23) in a SAR converter (17) to a reference voltage (VAZ) and also precharges a first terminal (3-j) of the capacitor to another reference voltage (GND). D... | 09/13/2011 |
| 7986153 | Method and apparatus for sensing An apparatus for sensing a change in capacitance of a sensing electrode to a system ground, such as that which may be used to form a touch sensor, with the sensing electrode forming touch sensitive surface is arranged to include a sleep mode of operation. The appara... | 07/26/2011 |
| 7977954 | Methods and systems for sigma delta capacitance measuring using shared components Methods, systems and devices are described for detecting a measurable capacitance using sigma-delta charge transfer techniques that can be implemented with many standard microcontrollers, and can share components to reduce device complexity and improve performance. ... | 07/12/2011 |
| 7973541 | Method and apparatus for estimating resistance and capacitance of metal interconnects Techniques for estimating resistance and capacitance of metal interconnects are described. An apparatus may include an interconnect, a set of pads, a set of isolation circuits, and a test circuit. The set of pads may be coupled to the interconnect and used for simul... | 07/05/2011 |
| 7902842 | Methods and systems for switched charge transfer capacitance measuring using shared components Methods, systems and devices are described for detecting a measurable capacitance using charge transfer techniques that can be implemented with many standard microcontrollers, and can share components to reduce device complexity and improve performance. In the vario... | 03/08/2011 |
| 7863909 | System and method for measuring a capacitance by transferring charge from a fixed source A touch sensor device and method is provided that determines measurable capacitances for object detection. The systems and methods measure capacitance by controllably transferring charge from a storage capacitor, and determining the measurable capacitance by measuri... | 01/04/2011 |
| 7863908 | Current measurement based on a charge in a capacitor A method is provided that comprises determining an amount of a first current from an amount of a charge stored in a first capacitor. Also, an apparatus is provided that comprises a reference timer circuit configured to generate a first signal indicating an expiratio... | 01/04/2011 |
| 7859272 | Method for measuring speed of conductor slipping through capacitive sensor A method for measuring a speed of a conductor slipping through a capacitive sensor. The method includes: sampling a capacitance of a sensing electrode at each preset time; determining a first threshold value and a second threshold value according to a peak value of ... | 12/28/2010 |
| 7830158 | Time-sloped capacitance measuring circuits and methods Time-sloped capacitance measuring circuits use the time to ramp voltage signals between reference levels to determine an unknown capacitance, where the ramping time is determined by the cumulative whole number of clock cycles counted during voltage signal ramping ov... | 11/09/2010 |
| 7830156 | Method for measuring velocity of conductor pressing on capacitive sensor A method for measuring a velocity of a conductor pressing on a capacitive sensor. The method includes: sampling a capacitance of a sensing electrode at each preset time; providing a threshold value; and determining the velocity of the conductor pressing on the capac... | 11/09/2010 |
| 7830157 | Pulsed capacitance measuring circuits and methods Capacitance measuring circuits and methods apply electrical charge pulses to ramp voltage signals across a voltage threshold, and use the number of pulses to determine the capacitance. Capacitances at multiple locations can be measured by storing a pulse counter val... | 11/09/2010 |
| 7825670 | Capacitance measuring apparatus for capacitor A measuring apparatus for measuring capacitance of a capacitor includes a microprocessor, a control circuit coupled to the capacitor, and an Analog-to-Digital (A/D) converting circuit. The control circuit receives a control signal from the microprocessor, and output... | 11/02/2010 |
| 7777501 | Methods and systems for sigma delta capacitance measuring using shared component Methods, systems and devices are described for detecting a measurable capacitance using sigma-delta charge transfer techniques that can be implemented with many standard microcontrollers, and can share components to reduce device complexity and improve performance. ... | 08/17/2010 |
| 7750649 | Methods and systems for detecting a capacitance using switched charge transfer techniques Methods, systems and devices are described for detecting a measurable capacitance using charge transfer techniques. According to various embodiments, a charge transfer process is performed for two or more times. During the charge transfer process, a pre-determined v... | 07/06/2010 |
| 7683637 | Touch sensor with electrostatic immunity and sensing method thereof The present invention relates to a touch sensor with electrostatic immunity and sensing method thereof. The touch sensor includes a sensing electrode, a discharge element, a sensing-controlling terminal and an input-output (I/O) control terminal, wherein the dischar... | 03/23/2010 |
| 7663379 | Capacitance-to-voltage conversion method and apparatus A method of capacitance-to-voltage conversion with an external sensor capacitor (CP) and a capacitance-to-voltage converter (14) implemented on an integrated readout circuit that includes a reference capacitor (CR), a sampling capacitor ... | 02/16/2010 |
| 7646206 | Apparatus and method for measuring the current consumption and the capacitance of a semiconductor device A measuring apparatus is provided which has least one voltage source for providing a supply voltage for a semiconductor device to be tested, at least one first tester channel connected to the supply voltage source via a first RC element having a first resistor and a... | 01/12/2010 |
| 7616011 | Detection apparatus for a capacitive proximity sensor A switched capacitance detection circuit is responsive to changes in the fringing capacitance of a capacitive proximity sensor having at least one capacitive sensor element. In cases where the sensor has a single sensor element, the switching frequency of the detect... | 11/10/2009 |
| 7602195 | Single pin multi-state identifier using RC timing element In a circuit identifier, an electrical circuit includes an output node to output an electrical signal. A resistor device and a capacitor device, electrically in series with the resistor device, receive at least a portion of the electrical signal. A counter device de... | 10/13/2009 |
| 7595648 | Device and method for reading a capacitive sensor, in particular of a micro-electromechanical type A read device of a capacitive sensor includes: a signal source supplying an electrical read signal for driving the capacitive sensor; and a discrete-time sense circuit for generating an electrical output signal, correlated to variations of capacitance of the capacit... | 09/29/2009 |
| 7521941 | Methods and systems for detecting a capacitance using switched charge transfer techniques Methods, systems and devices are described for detecting a measurable capacitance using charge transfer techniques. According to various embodiments, a charge transfer process is performed for two or more times. During the charge transfer process, a pre-determined v... | 04/21/2009 |
| 7479791 | Circuit arrangement for a capacitive proximity switch Disclosed is a charge transfer-based circuit arrangement for capacitive proximity switches comprising a capacitive sensor element (C3), the capacity of which changes according to the actuation mode. The circuit arrangement includes a central capacitor (C2 | 01/20/2009 |
| 7449895 | Methods and systems for detecting a capacitance using switched charge transfer techniques Methods, systems and devices are described for detecting a measurable capacitance using charge transfer techniques. According to various embodiments, a charge transfer process is performed for two or more times. During the charge transfer process, a pre-determined v... | 11/11/2008 |
| 7423437 | Methods and systems for detecting a capacitance using sigma-delta measurement techniques Methods, systems and devices are described for detecting a measurable capacitance using sigma-delta measurement techniques. According to various embodiments, a voltage is applied to the measurable capacitance using a first switch. The measurable capacitance is allow... | 09/09/2008 |
| 7417441 | Methods and systems for guarding a charge transfer capacitance sensor for proximity detection Methods, systems and devices are described for determining a measurable capacitance for proximity detection in a sensor having a plurality of sensing electrodes and at least one guarding electrode. A charge transfer process is executed for at least two executions. T... | 08/26/2008 |
