公开(公告)号：US12212283B2

公开(公告)日：2025-01-28

申请号：US17733359

申请日：2022-04-29

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yongchang Yu ,  Min Yi ,  Weinan Li

IPC: H03F1/02 ,  H03F3/45

Abstract: This application provides an operational amplifier and a start-up circuit of the operational amplifier. The start-up circuit has the advantages of having a simple structure and consuming less. The operational amplifier includes a multi-stage amplifier and a start-up circuit, where the start-up circuit includes a first start-up transistor and a second start-up transistor. A source of the first start-up transistor and a source of the second start-up transistor are connected to a tail bias node of a first-stage amplifier in the multi-stage amplifier, a gate of the first start-up transistor and a gate of the second start-up transistor are configured to connect to a first bias voltage Vb, and a drain of the first start-up transistor and a drain of the second start-up transistor are connected to input terminals of a second-stage or higher-stage amplifier.

公开(公告)号：US09899988B2

公开(公告)日：2018-02-20

申请号：US14710244

申请日：2015-05-12

Applicant: Huawei Technologies Co., Ltd.

Inventor： Yongchang Yu ,  Tao Liu ,  Weinan Li

IPC: H03J5/14 ,  H04W88/00 ,  H04B1/04 ,  H03K17/60 ,  H03K17/687 ,  H03K17/693 ,  H03K17/10

CPC classification number: H03J5/14 ,  H03J2200/06 ,  H03K17/10 ,  H03K17/102 ,  H03K17/60 ,  H03K17/687 ,  H03K17/693 ,  H03K2217/0018 ,  H03K2217/0054 ,  H04B1/04 ,  H04W88/00

Abstract: A switch, an antenna tuner, and a radio frequency apparatus are provided. The switch includes: 2N successively serially connected transistors. In the 2N successively serially connected transistors, control ends of any two transistors with closest odd sequence numbers are coupled to each other through a first resistor, and control ends of any two transistors with closest even sequence numbers are coupled to each other through a second resistor; a control end of an n-th transistor is coupled to a first control signal in a switch control signal, and a control end of an (n+1)-th transistor is coupled to the first control signal, where n is an integer that is greater than or equal to 1 and is less than or equal to 2N−1, N is an integer greater than or equal to 2, and the first control signal is used to control turn-on or turn-off of the switch.

公开(公告)号：US20240396504A1

公开(公告)日：2024-11-28

申请号：US18321090

申请日：2023-05-22

Applicant: Huawei Technologies Co., Ltd.

Inventor： Keji Cui ,  Di Li ,  Yongchang Yu

IPC: H03F1/26 ,  H01Q1/24 ,  H01Q5/335 ,  H03F1/56 ,  H03F3/24

Abstract: This application provides a multi-band low noise amplifier, including: an input end, a first input matching network, a second input matching network, a first amplifier, and a second amplifier. The input end is coupled to an antenna and is configured to receive an inter-band carrier aggregation signal, where the inter-band carrier aggregation signal includes a first carrier signal located in a first band and a second carrier signal located in a second band, and the first band is different from and does not overlap the second band. The first input matching network is coupled between the input end and the first amplifier and is configured to perform impedance matching for the first carrier signal. The second input matching network is coupled between the input end and the second amplifier and is configured to perform impedance matching for the second carrier signal.

公开(公告)号：US20230344125A1

公开(公告)日：2023-10-26

申请号：US18345373

申请日：2023-06-30

Applicant: Huawei Technologies Co., Ltd.

Inventor： Keji Cui ,  Di Li ,  Peng Gao ,  Yongchang Yu

IPC: H01Q3/36 ,  H03K5/00 ,  H04B7/06

CPC classification number: H01Q3/36 ,  H03K5/00006 ,  H04B7/0617 ,  H03K2005/00286

Abstract: A phased array includes a local oscillator signal adjustment path, a first adder, a first power divider, and a plurality of radio-frequency signal transmit channels. An output end of the local oscillator signal adjustment path is coupled to a first input end of the first adder, and is configured to input a first signal to the first adder. A second input end of the first adder is coupled to a transmit path, and is configured to receive a second signal, and the first adder superimposes the first signal on the second signal to generate a to-be-transmitted signal. An input end of the first power divider is coupled to an output end of the first adder, an output end of the first power divider is coupled to input ends of the plurality of radio-frequency signal transmit channels.