公开(公告)号：US12160244B2

公开(公告)日：2024-12-03

申请号：US17806679

申请日：2022-06-13

Applicant: QUALCOMM Incorporated

Inventor： Xiahan Zhou ,  Haibo Fei

IPC: H03M1/00 ,  H03M1/10 ,  H03M1/66

Abstract: Methods and apparatus for controlling a power supply voltage for a switch driver in a digital-to-analog converter (DAC). An example DAC generally includes a plurality of DAC cells, each DAC cell comprising a current source, a first switch coupled in series with the current source at a first node, and a switch driver having an output coupled to a control input of the first switch; and calibration circuitry having a first input coupled to a first DAC cell in the plurality of DAC cells and having an output coupled to at least one of the plurality of DAC cells, the calibration circuitry being configured to sense a voltage of the first node in the first DAC cell and to control the power supply voltage for the switch driver in the at least one of the plurality of DAC cells, based on the sensed voltage of the first node.

公开(公告)号：US09461589B2

公开(公告)日：2016-10-04

申请号：US14475822

申请日：2014-09-03

Applicant: QUALCOMM Incorporated

Inventor： Jingxue Lu ,  Ankit Srivastava ,  Haibo Fei

IPC: H03F1/02 ,  H03F3/217 ,  H03F3/183 ,  H03F1/52 ,  H03F3/45

CPC classification number: H03F1/0205 ,  H03F1/523 ,  H03F3/183 ,  H03F3/217 ,  H03F3/2173 ,  H03F3/45179 ,  H03F3/45475 ,  H03F2200/03 ,  H03F2200/33 ,  H03F2200/351 ,  H03F2200/481

Abstract: Disclosed is an amplifier circuit having an output stage that includes an H-bridge circuit. The H-bridge circuit includes sense resistors on one side of the circuit. A current detection circuit can produce an output indicative of current flow through a load based on voltages across the sense resistors.

Abstract translation: 公开了具有包括H桥电路的输出级的放大器电路。 H桥电路包括电路一侧的检测电阻。 电流检测电路可以基于感测电阻器两端的电压产生指示通过负载的电流的输出。

公开(公告)号：US11728822B2

公开(公告)日：2023-08-15

申请号：US17359918

申请日：2021-06-28

Applicant: QUALCOMM Incorporated

Inventor： Shahin Mehdizad Taleie ,  Dongwon Seo ,  Ashok Swaminathan ,  Gurkanwal Singh Sahota ,  Andrew Weil ,  Haibo Fei

IPC: H03M1/74 ,  H03M1/46 ,  H03M1/50 ,  H03M1/78 ,  H03M1/00 ,  H03M1/12

CPC classification number: H03M1/747 ,  H03M1/002 ,  H03M1/1295 ,  H03M1/466 ,  H03M1/502 ,  H03M1/742 ,  H03M1/785

Abstract: Certain aspects of the present disclosure provide a digital-to-analog converter (DAC) system. The DAC system generally includes a plurality of current steering cells, each comprising a current source coupled to at least two current steering switches, wherein control inputs of the at least two current steering switches are coupled to an input path of the DAC system. The DAC system may also include a current source toggle circuit configured to selectively disable the current source of at least one of the plurality of current steering cells, and a feedforward path coupled between the input path and at least one control input of the current source toggle circuit.

公开(公告)号：US20160065134A1

公开(公告)日：2016-03-03

申请号：US14475822

申请日：2014-09-03

Applicant: QUALCOMM Incorporated

Inventor： Jingxue Lu ,  Ankit Srivastava ,  Haibo Fei

IPC: H03F1/02 ,  H03F3/217 ,  H03F3/183

CPC classification number: H03F1/0205 ,  H03F1/523 ,  H03F3/183 ,  H03F3/217 ,  H03F3/2173 ,  H03F3/45179 ,  H03F3/45475 ,  H03F2200/03 ,  H03F2200/33 ,  H03F2200/351 ,  H03F2200/481

Abstract: Disclosed is an amplifier circuit having an output stage that includes an H-bridge circuit. The H-bridge circuit includes sense resistors on one side of the circuit. A current detection circuit can produce an output indicative of current flow through a load based on voltages across the sense resistors.

Abstract translation: 公开了具有包括H桥电路的输出级的放大器电路。 H桥电路包括电路一侧的检测电阻。 电流检测电路可以基于感测电阻器两端的电压产生指示通过负载的电流的输出。

公开(公告)号：US12081233B2

公开(公告)日：2024-09-03

申请号：US17810100

申请日：2022-06-30

Applicant: QUALCOMM Incorporated

Inventor： Haibo Fei ,  Xiahan Zhou

IPC: H03M1/78 ,  H03M1/06

CPC classification number: H03M1/785 ,  H03M1/0607

Abstract: Methods and apparatus for common-mode current removal in a digital-to-analog converter (DAC). An example DAC circuit generally includes a plurality of current-steering cells, a resistor ladder circuit coupled to the plurality of current-steering cells, a first current sink coupled between a shunt branch of the resistor ladder circuit and a reference potential node for the DAC circuit, and a second current sink coupled between a first output of the DAC circuit and the reference potential node.