公开(公告)号：US20230137935A1

公开(公告)日：2023-05-04

申请号：US18146832

申请日：2022-12-27

Applicant: QUALCOMM Incorporated

Inventor： Ramkumar SIVAKUMAR ,  Jingxue LU ,  Sherif GALAL ,  Xinwang ZHANG ,  Kshitij YADAV

IPC: G01R19/00 ,  H04R3/00 ,  H03F3/217 ,  H03F1/02

Abstract: Certain aspects of the present disclosure are generally directed to circuitry and techniques for voltage-to-current conversion. For example, certain aspects provide a circuit for signal amplification including a first amplifier; a first transistor, a gate of the first transistor being coupled to an output of the first amplifier and a drain of the first transistor being coupled to an output node of circuit; a first resistive element coupled between a first input node of the circuit and an input of the first amplifier; a second amplifier; a second transistor, a gate of the second transistor being coupled to an output of the second amplifier and a drain of the second transistor being coupled to the output node of circuit; and a second resistive element coupled between a second input node of the circuit and an input of the second amplifier.

公开(公告)号：US20180352321A1

公开(公告)日：2018-12-06

申请号：US15613871

申请日：2017-06-05

Applicant: QUALCOMM Incorporated

Inventor： Jingxue LU ,  Vijayakumar DHANASEKARAN ,  Meysam AZIN ,  Arash MASHAYEKHI ,  Kshitij YADAV

IPC: H04R1/10 ,  H03F3/183 ,  H04R1/06

CPC classification number: H04R1/1091 ,  H03F1/26 ,  H03F3/183 ,  H03F3/187 ,  H03F3/2173 ,  H03F3/45475 ,  H03F3/68 ,  H03F2200/03 ,  H04R1/06

Abstract: An example apparatus includes an output jack including a ground pole and a power output pole, a power supply circuit configured to generate a power signal, a coupler circuit operably coupled to the ground pole and the power output pole of the output jack, such that the coupler circuit is configured to couple the power signal with a noise signal on the ground pole to generate a combined output signal on the power output pole.

公开(公告)号：US20160056763A1

公开(公告)日：2016-02-25

申请号：US14464580

申请日：2014-08-20

Applicant: QUALCOMM Incorporated

Inventor： Shitong ZHAO ,  Jingxue LU

IPC: H03B5/24

CPC classification number: H03B5/24 ,  H03K3/0231 ,  H03K3/26 ,  H03K4/00 ,  H03K4/06

Abstract: An RC oscillator includes a first capacitive element and a second capacitive element and a comparator having a first input, a second input, and an output for outputting an oscillating signal. The oscillator further includes an integrator having a first input, a second input coupled to a reference voltage source, and an output coupled to the second input of the comparator. The oscillator further includes a switch circuit configured to provide a voltage of the first capacitive element to the first input of the comparator in a cycle and a voltage of the second capacitive element to the first input of the comparator in a subsequent cycle. The integrator is configured to sample and to hold the voltage of the second capacitive element continuously in the cycle.

Abstract translation: RC振荡器包括第一电容元件和第二电容元件以及具有第一输入，第二输入和用于输出振荡信号的输出的比较器。 振荡器还包括具有第一输入，耦合到参考电压源的第二输入和耦合到比较器的第二输入的输出的积分器。 振荡器还包括开关电路，其被配置为在随后的周期中将第一电容元件的电压以比较器的第一输入和第二电容元件的电压提供给比较器的第一输入。 积分器被配置为在该周期中连续地采样并保持第二电容元件的电压。

公开(公告)号：US20210194517A1

公开(公告)日：2021-06-24

申请号：US17125252

申请日：2020-12-17

Applicant: QUALCOMM INCORPORATED

Inventor： Iulian MIREA ,  Gerard James WIMPENNY ,  Jingxue LU ,  Jongshick AHN

IPC: H04B1/04 ,  H03F1/02 ,  H03F3/24

Abstract: An envelope tracking system includes an envelope signal generator, a supply modulator coupled to the envelope signal generator, the supply modulator comprising a switching regulator path configured to provide an output voltage at an output node to a power amplifier when in an average power tracking (APT) mode, the switching regulator path configured to operate together with a linear path to provide the output voltage at the output node to the power amplifier when in an envelope tracking (ET) mode, a capacitor having a first and second terminal, the first terminal coupled to ground, a switch coupled between the output node and the second terminal of the capacitor, the switch being configured to selectively disconnect the capacitor from the output node, and a circuit coupled between the output node and the second terminal of the capacitor, the circuit comprising a bi-directional current-limiting switch, the circuit configured to charge or discharge the capacitor such that a voltage across the capacitor changes from a first voltage to a second voltage.

公开(公告)号：US20220021348A1

公开(公告)日：2022-01-20

申请号：US16929353

申请日：2020-07-15

Applicant: QUALCOMM Incorporated

Inventor： Justin PHILPOTT ,  Xiaocheng JING ,  Jingxue LU ,  Iulian MIREA

IPC: H03F1/30 ,  H04B1/04 ,  H04B1/16

Abstract: Aspects of the present disclosure provide a high voltage switch with a fast turn-off. An example power supply circuit generally includes a capacitive element for coupling to a power terminal of an amplifier, a first switch configured to be closed in a first mode and to be open in a second mode, a second switch coupled in series between the first switch and the capacitive element and configured to be closed in the first mode and to be open in the second mode, a first circuit coupled to the first switch and configured to charge the capacitive element and power the amplifier in the first mode, and a buffer circuit having an output coupled to a first node and configured to output a first voltage level greater than half of a second voltage level at a second node.

公开(公告)号：US20210231710A1

公开(公告)日：2021-07-29

申请号：US17154758

申请日：2021-01-21

Applicant: QUALCOMM Incorporated

Inventor： Ramkumar SIVAKUMAR ,  Jingxue LU ,  Sherif GALAL ,  Xinwang ZHANG ,  Kshitij YADAV

IPC: G01R19/00 ,  H04R3/00 ,  H03F3/217 ,  H03F1/02

Abstract: Certain aspects of the present disclosure are generally directed to circuitry and techniques for voltage-to-current conversion. For example, certain aspects provide a circuit for signal amplification including a first amplifier; a first transistor, a gate of the first transistor being coupled to an output of the first amplifier and a drain of the first transistor being coupled to an output node of circuit; a first resistive element coupled between a first input node of the circuit and an input of the first amplifier; a second amplifier; a second transistor, a gate of the second transistor being coupled to an output of the second amplifier and a drain of the second transistor being coupled to the output node of circuit; and a second resistive element coupled between a second input node of the circuit and an input of the second amplifier.