Mediatek Corporation

Mediatek Singapore Pte. Ltd.

Hao-Ping Hong

Yen-Hsun Hsu

Hung-Chih Lin

Sheng-Hong Yan

Chun-Yen Tseng

Hung-I Wang

Ding-Shiuan Shen

Chih-Wei Lin

Patrick Stanley Riehl

Chien-Wei Kuan

Shang-Pin Chen

Yung-Yu Lin

Yung-Chih Yen

Shang-Ping Chen

Shih-Mei Lin

Chih-Pin Sun

Kun-Hsien Li

Hung-chih Lin

Yen-hsun Hsu

A buck converter includes an output stage, a FCVB control circuit and a driver. The output stage includes a plurality of switches and a flying capacitor, wherein the switches are connected in series, the flying capacitor is coupled between two of the switches, and the output stage is configured to receive an input voltage to generate an output voltage. The FCVB control circuit is configured to compare a voltage of the flying capacitor with half of the input voltage to generate a comparison result, and the FCVB control circuit further responds to the comparison result to generate a first control signal and a second control signal based on a first PWM signal and a second PWM signal. The driver is configured to generate a plurality of diving signals according to the first control signal and the second control signal, wherein the driving signals are arranged to control the switches, respectively.

Bang-bang flying capacitor voltage balance for buck converter

A resonator circuit includes: a first inductive element and a second inductive element that is connected to the first inductive element in series; a first capacitive element, connected to a first end of the first inductive element and a first output end of the resonator circuit; and a set of second capacitive elements connected in series, the set of second capacitive elements having one end connected between the first and second inductive elements and having another end connected between the second inductive element and a second output end of the resonator circuit. The intermediate end of the set of second capacitive elements is used as a third output end of the resonator circuit.

Multi-mode wireless receiver apparatus and resonator circuit design

A method for performing efficiency optimization of an electronic device and an associated apparatus are provided, where the method includes the steps of: performing at least one detection operation according to at least one signal of the electronic device to generate at least one detection result; and selecting a rectifier size of a plurality of rectifier sizes of a configurable rectifier within the electronic device according to the at least one detection result, to control the configurable rectifier to operate with the rectifier size, wherein the configurable rectifier is arranged for performing rectification operations, and the configurable rectifier is configurable to operate with at least one portion of the configurable rectifier being activated.

Method for performing efficiency optimization of an electronic device, and associated apparatus

A buck-boost converter includes an inductor, a first switch, a second switch, a third switch, a fourth switch and a fifth switch, wherein the first switch is coupled between an input voltage and a first terminal of the inductor, the second switch is coupled between a reference voltage and the first terminal of the inductor, the third switch is coupled between an output voltage and a second terminal of the inductor, the fourth switch is coupled between the reference voltage and the second terminal of the inductor, and the fifth switch is connected in parallel with the third switch. When the buck-boost converter operates in a buck mode, the first switch and the second switch are turned on alternately; when the buck-boost converter operates in a boost mode, the third switch and the fourth switch are turned on alternately; and the fifth switch is controlled by a mode control signal.

Buck-boost converter and method for controlling buck-boost converter

A power converter includes a wave generator, a low pass filter, a first control circuit, and a second control circuit. The wave generator receives an input voltage, and converts the input signal into a wave signal according to a first control signal and a second control signal. The low pass filter filters the wave signal to generate an output voltage. The first control circuit generates the first control signal according to the wave signal and the output voltage. The second control circuit generates the second control signal according to the wave signal and the output voltage.

Power converter with a wave generator that filters a wave signal to generate an output voltage

A universal serial bus device includes: a core circuit having a first pin and a second pin, and having an input impedance looking into the core circuit from the first pin and the second pin; and a charging control circuit, coupled to the core circuit, arranged for selectively providing a voltage source to one of the first pin and the second pin; wherein the input impedance of the core circuit is configured to make the voltage source substantially intact when the voltage source is coupled to one of the first pin and the second pin.

USB device for making I/O pin with intact voltage during charging procedure and related method

A hybrid power module for supplying a power to a power amplifier is provided. The hybrid power module includes a DC-DC converter and a linear regulator. The DC-DC converter provides a first current to the power amplifier via a first inductor according to an operating frequency and an envelope tracking signal. The linear regulator provides a second current to the power amplifier via a first capacitor according to the envelope tracking signal. A switch-mode power supply (SMPS) ripple voltage caused by the DC-DC converter is reduced by the linear regulator.

Hybrid power module

A universal serial bus device includes: a core circuit having a first pin and a second pin, and having an input impedance looking into the core circuit from the first pin and the second pin; and a charging control circuit, coupled to the core circuit, arranged for providing a voltage source having a predetermined voltage to one of the first pin and the second pin and for providing a current source having a predetermined current to the other of the first pin and the second pin; wherein the input impedance of the core circuit is configured to make the predetermined voltage and the predetermined current substantially intact when an external charger charges a battery device of the universal serial bus device.

Universal serial bus device and charging and enumeration method

A communication unit has an envelope tracking system operably coupled to a power amplifier, PA, module. The envelope tracking system has at least one slew rate module arranged to re-distribute a slew rate across a number of input samples according to a maximum slew rate of the number of input samples; and a supply modulator arranged to variably control a supply voltage for the PA module in response to an output of the at least one slew rate module.

Methods and apparatus for envelope tracking system

An integrated circuit is described for providing a power supply to a radio frequency (RF) power amplifier (PA). The integrated circuit comprises a low-frequency power supply path comprising a switching regulator and a high-frequency power supply path arranged to regulate an output voltage of a combined power supply at an output port of the integrated circuit for coupling to a load. The combined power supply is provided by the low-frequency power supply path and high-frequency power supply path. The high-frequency power supply path comprises: an amplifier comprising a voltage feedback and arranged to drive a power supply signal on the high-frequency power supply path; and a high-frequency-path supply module arranged to provide a high frequency supply to drive the amplifier, where the high-frequency-path supply module comprises a pulse-width modulator operably coupled to the high frequency supply via a filter and arranged to provide a filtered pulse-width modulated signal to the high frequency supply.

Integrated circuit wireless communication unit and method for providing a power supply

A communication unit includes a radio frequency, RF, transmitter having: a power amplifier, PA, module; and an envelope tracking system operably coupled to the PA module and having a supply modulator arranged to variably control a supply voltage for the PA module in response to a number of input samples of an envelope signal; wherein the envelope tracking system further includes at least one slew rate module arranged to re-distribute a maximum slew rate across the number of input samples in a provision of a variable power supply to the PA module.

A method for detecting a user's touch on a touch panel includes: deriving a plurality of geometric differences of a first direction of the touch panel, wherein each of the geometric differences of the first direction represents a difference between respective coupling amounts at two locations of a plurality of locations of the first direction on the touch panel; and analyzing the geometric differences of the first direction to obtain at least one analysis result, wherein the analysis result comprises information representing whether the user touches the touch panel in one or more places.

Methods and apparatus for detecting user's touch on a touch panel

An operating circuit includes a differential amplifier stage, which has a first input node for receiving a first input signal of a differential input, a second input node for receiving a second input signal of the differential input, a first output node for outputting a first output signal of a differential output, and a second output node for outputting a second output signal of the differential output; an offset current stage coupled to the first output node and the second output node for inducing a first offset current at the first output node and a second offset current at the second output node; and a first clamping device coupled to the first output node for selectively clamping an output voltage at the first output node according to the first output signal at the first output node.

Operating circuit

A reference voltage device and a reference voltage generating method thereof. The reference voltage device comprises a bandgap unit, a voltage generating unit, a comparator, and a calibration controller. The calibration controller controls the voltage generating unit to generate a final calibrating voltage to serve as an ideal target voltage. The bandgap unit generates a bandgap voltage with zero offset voltage according to the final calibrating voltage to serve as a reference voltage. The variation of the reference voltage output by the reference voltage device is thus reduced.

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Hsinchu County, Taiwan

Hao-Ping Hong