公开(公告)号：US20240421811A1

公开(公告)日：2024-12-19

申请号：US18741134

申请日：2024-06-12

Applicant: MEDIATEK INC.

Inventor： Chin-Kai LAI ,  Kuan-Ta CHEN

IPC: H03K17/08 ,  H03K3/03 ,  H03K19/20

Abstract: A ring oscillator with an overstress solution is shown, which includes a plurality of oscillation units connected in a ring, and two capacitors. The first capacitor has a first terminal and a second terminal that are respectively coupled to a first node and a second node of the ring. The second node is an input terminal of a first-stage oscillation unit. The first node is an output terminal of a later-stage oscillation unit. The first signal at the first node is generated by inverting an input signal coupled to the input terminal of the first-stage oscillation unit an even number of times. The second capacitor is coupled between the second node and the ground terminal.

公开(公告)号：US20180233499A1

公开(公告)日：2018-08-16

申请号：US15953772

申请日：2018-04-16

Applicant: MEDIATEK INC.

Inventor： Sung-Han WEN ,  Kuan-Ta CHEN

IPC: H01L27/08 ,  H01L29/8605 ,  H01L49/02 ,  H01C10/14 ,  H03F3/45

CPC classification number: H01L27/0802 ,  H01C10/14 ,  H01L28/20 ,  H01L29/8605 ,  H03F3/45475 ,  H03F3/45937 ,  H03F2203/45418 ,  H03F2203/45424 ,  H03F2203/45528

Abstract: An impedance circuit includes a first poly-resistor and a second poly-resistor. The first poly-resistor has a first terminal coupled to a first node, and a second terminal coupled to a second node. The second poly-resistor has a first terminal coupled to the first node, and a second terminal coupled to the second node. The resistance between the first terminal and the second terminal of the first poly-resistor is determined according to a first control voltage. The resistance between the first terminal and the second terminal of the second poly-resistor is determined according to a second control voltage. The first control voltage and the second control voltage are determined according to a first voltage at the first node and a second voltage at the second node.

公开(公告)号：US20170105063A1

公开(公告)日：2017-04-13

申请号：US14878215

申请日：2015-10-08

Applicant: MediaTek Inc.

Inventor： Jing-Yi HUANG ,  Kuan-Ta CHEN ,  Chih-Ping LIN

IPC: H04R1/10 ,  H04R29/00

CPC classification number: H04R1/1041 ,  H04R1/1033 ,  H04R29/001 ,  H04R2460/03 ,  H04R2460/15 ,  H04R2499/11

Abstract: A portable device and a method for entering a power-saving mode are provided. An audio signal is transmitted to an earphone via a cable. At least one electrical characteristic on the cable is sensed to generate at least one sensing signal. The at least one sensing signal is sampled to generate at least one data signal. Whether the earphone is in listening position is determined according to the at least one data signal. When it is determined that the earphone is not in listening position, the portable device enters a power-saving mode.

公开(公告)号：US20230378971A1

公开(公告)日：2023-11-23

申请号：US18157150

申请日：2023-01-20

Applicant: MEDIATEK INC.

Inventor： Pang-Yen CHIN ,  Wei-Hsin TSENG ,  Kuan-Ta CHEN

IPC: H03M1/46

CPC classification number: H03M1/46

Abstract: A high-speed successive-approximation register analog-to-digital converter (SAR ADC) is shown. A digital-to-analog converter (DAC), a comparator, and a SAR logic circuit are configured to form a loop for successive approximation of a digital representation of an analog input. The SAR logic circuit includes a plurality of latches. Each latch uses a one-gate-delay circuit to wire the comparator to one bit-control terminal of the DAC.

公开(公告)号：US20180102404A1

公开(公告)日：2018-04-12

申请号：US15693548

申请日：2017-09-01

Applicant: MEDIATEK INC.

Inventor： Sung-Han WEN ,  Kuan-Ta CHEN

IPC: H01L49/02 ,  H01L29/06 ,  H01L27/08

Abstract: An impedance circuit includes a poly-resistor and a controller. The poly-resistor has a first terminal and a second terminal. The controller generates a first control voltage and a second control voltage. The resistance between the first terminal and the second terminal of the poly-resistor is determined according to the first control voltage and the second control voltage. The second control voltage is different from the first control voltage. The proposed impedance circuit can improve the linearity of the poly-resistor.

公开(公告)号：US20210265959A1

公开(公告)日：2021-08-26

申请号：US17132166

申请日：2020-12-23

Applicant: MEDIATEK INC.

Inventor： Fong-Wen LEE ,  Kuan-Ta CHEN

IPC: H03F3/217 ,  H03F1/34 ,  H03F1/26

Abstract: A class-D amplifier with low pop-click noise is shown. A loop filter, a control signal generator, a first power driver, and a first feedback circuit are provided within the class-D amplifier to establish a first loop for signal amplification. The class-D amplifier further has a settling circuit and a pre-charging circuit. The settling circuit is configured to be combined with the loop filer and the control signal generator to establish a second loop to settle the loop filter and the control signal generator before the first loop is enabled. The pre-charging circuit is configured to pre-charge a positive output terminal and a negative output terminal of the first power driver.

公开(公告)号：US20180279035A1

公开(公告)日：2018-09-27

申请号：US15989501

申请日：2018-05-25

Applicant: MEDIATEK INC.

Inventor： Jing-Yi HUANG ,  Kuan-Ta CHEN ,  Chih-Ping LIN

IPC: H04R1/10 ,  H04R29/00

CPC classification number: H04R1/1041 ,  H04R1/1033 ,  H04R29/001 ,  H04R2460/03 ,  H04R2460/15 ,  H04R2499/11

Abstract: A portable device and a method for entering a power-saving mode are provided. Audio stream is generated by an audio player, and an audio signal is generated according to the audio stream and then transmitted to an earphone via a cable by a digital-analog converter. At least one electrical characteristic on the cable is sensed to generate at least one sensing signal. The at least one sensing signal is sampled to generate at least one data signal. Whether the earphone is inserted into an ear canal is determined according to the at least one data signal. For determining whether the earphone is inserted into the ear canal, an impedance frequency response related to the earphone is obtained according to the at least one data signal, and whether the earphone is inserted into the ear canal is determined according to a characteristic of peaks of the impedance frequency response.

公开(公告)号：US20180152140A1

公开(公告)日：2018-05-31

申请号：US15806688

申请日：2017-11-08

Applicant: MEDIATEK INC.

Inventor： Wei-Lin CHEN ,  Kuan-Ta CHEN

IPC: H03B5/20

CPC classification number: H03B5/20 ,  H03B5/24 ,  H03B5/26

Abstract: An oscillation device includes an oscillator and a logic circuit. The oscillator generates an output oscillation signal. The logic circuit controls the oscillator according to the output oscillation signal, such that the output oscillation signal includes two different oscillation periods. The oscillation device may be used as a temperature-to-frequency converter without any bandgap reference circuit.