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2039 条记录 (耗时 0.022 秒)

    POLY PHASE FILTER WITH PHASE ERROR ENHANCE TECHNIQUE
    12.
    发明公开
    POLY PHASE FILTER WITH PHASE ERROR ENHANCE TECHNIQUE 审中-公开

    公开(公告)号：EP4167488A1

    公开(公告)日：2023-04-19

    申请号：EP22190376.8

    申请日：2022-08-15

    申请人： MediaTek Inc.

    发明人： LEE, Fong-Wen ,  WANG, Wen-Chieh ,  LIN, Yu-Hsin

    IPC分类号： H03L7/081 ,  H03B27/00 ,  H03D3/00 ,  H03H7/21 ,  H03H11/22

    摘要： The present invention provides a filtering circuit comprising a poly phase filter and a quadrature phase detector. The poly phase filter comprises a first path, a second path, a third path and a fourth path. The first path is configured to receive a first input signal to generate a first clock signal. The second path comprising a first adjustable delay circuit is configured to receive the first input signal to generate a second clock signal. The third path comprising a second adjustable delay circuit is configured to receive a second input signal to generate a third clock signal. The fourth path is configured to receive the second input signal to generate a fourth clock signal. The quadrature phase detector is configured to detect phases of these clock signals to generate control signals to control the first adjustable delay circuit and the second adjustable delay circuit.

    FILTER CIRCUIT USING POLYPHASE FILTER WITH DYNAMIC RANGE ENHANCEMENT
    15.
    发明公开
    FILTER CIRCUIT USING POLYPHASE FILTER WITH DYNAMIC RANGE ENHANCEMENT 审中-公开

    公开(公告)号：EP4009521A1

    公开(公告)日：2022-06-08

    申请号：EP21207863.8

    申请日：2021-11-11

    申请人： MEDIATEK INC.

    发明人： LEE, Fong-Wen ,  WANG, Wen-Chieh ,  LIN, Yu-Hsin

    IPC分类号： H03H11/20 ,  H03H11/22 ,  H03H7/20 ,  H03H7/21 ,  H03K5/15

    摘要： A filter circuit includes a polyphase filter (200) used to generate a plurality of output signals (I p ,I n ,Q p ,Q n ) with different phases according to a plurality of input signals (Vip,Vin). The polyphase filter includes a switch circuit (MN1) and a feed-forward capacitor (C_ff1). The switch circuit has a control terminal (N12) used to receive a control voltage, a first connection terminal used to output one of the output signals, and a second connection terminal (N11) used to receive one of the input signals. The feed-forward capacitor has a first plate coupled to the second connection terminal of the switch circuit and a second plate coupled to the control terminal of the switch circuit. The variable resistance of the switch is used as resistor in the RC polyphase structure. The feed-forward capacitor is used for continuous time bootstrapping of the switch circuit such that the resistance of the switch is not influenced by the signal swing of the input signal. The feed-forward capacitor together with a bias resistor at the control terminal of the switch circuit forms a high-pass filter for coupling the input signal to the control terminal.

    TIME-DIVISION INTERLEAVING BANDPASS FILTER FOR VOICE ACTIVITY DETECTION
    16.
    发明公开
    TIME-DIVISION INTERLEAVING BANDPASS FILTER FOR VOICE ACTIVITY DETECTION 审中-公开

    公开(公告)号：EP3985872A1

    公开(公告)日：2022-04-20

    申请号：EP21784927.2

    申请日：2021-03-04

    申请人： REEXEN TECHNOLOGY CO., LTD.

    发明人： YANG, Xiaofeng ,  YANG, Minhao ,  LIU, Hongjie

    IPC分类号： H03H11/04 ,  G10L25/84

    摘要： The present invention relates to a time division interleaving band-pass filter for use in voice activity detection, which operates at different central frequencies in respective intervals of a predetermined period of time. The band-pass filter circuitry includes multiple band-pass filtering channels sharing a common transistor circuit, bias circuit and current mirror circuit. The multiple band-pass filtering channels operate in a time division interleaving manner, which enables the sharing of the common set of band-pass filter circuitry components. Thus, the present invention allows a reduced chip area as the area does not increase proportionally with the number of filtering channels. The invention also mitigates the influence of transistor fabrication variations on the filter's central frequencies. Moreover, pulse durations t i are additionally introduced to the determination of the central frequencies, dispensing with the need for matching of current mirror circuits and transistors and resulting in higher accuracy of the band-pass filter's central frequencies. As a result, more band-pass filtering channels with different central frequencies can be included for a given frequency range.

    WILKINSON POWER COMBINER, COMMUNICATON UNIT AND METHOD THEREFOR
    17.
    发明公开
    WILKINSON POWER COMBINER, COMMUNICATON UNIT AND METHOD THEREFOR 审中-公开

    公开(公告)号：EP3958463A1

    公开(公告)日：2022-02-23

    申请号：EP20213765.9

    申请日：2020-12-14

    申请人： NXP B.V.

    发明人： Yang, Xin ,  van der Heijden, Mark Pieter

    IPC分类号： H03H7/01 ,  H03H7/09 ,  H03H7/48 ,  H03H11/36 ,  H03H7/38 ,  H03H11/28

    摘要： A Wilkinson power combiner (202) is described that includes a high-pass, HP, frequency circuit (500, 550), wherein the HP frequency circuit (500, 550) comprises at least one of: (i) one input port (510) coupled to at least two output ports (512, 514) via at least two paths; and an input shunt inductor (520) coupling the input port (510) to ground; wherein the one input port (510) is coupled to the at least two output ports (512, 514) via respective series capacitances (230, 238) on the at least two paths, which in cooperation with the input shunt inductor (520) forms a first HP frequency circuit; and (ii) at least one resistor (554, 526) - inductor (552, 524), R-L isolation circuit (500, 550) configured to couple the at least two output ports (512, 514) that forms a second HP frequency circuit.

    TUNABLE BANDPASS FILTER WITH HIGH STABILITY AND ORTHOGONAL TUNING
    19.
    发明公开
    TUNABLE BANDPASS FILTER WITH HIGH STABILITY AND ORTHOGONAL TUNING 审中-公开

    公开(公告)号：EP3926828A1

    公开(公告)日：2021-12-22

    申请号：EP21179567.9

    申请日：2021-06-15

    申请人： Anlotek Limited

    发明人： NIELSEN, Jorgen Staal

    IPC分类号： H03H11/12

    摘要： A method of stabilizing a variable filter for an analog electromagnetic signal against circuit oscillation includes the steps of: providing a signal loop comprising a signal input, a signal output, and a plurality of variable circuit elements connected in the signal loop, the plurality of variable circuit elements comprising an adjustable resonator and an adjustable gain block, the signal loop having a variable frequency response that is characterized by a central frequency, a frequency passband, a response Q, and an operating point and a resonator response curve that are plottable in a Cartesian s-plane having an origin, a real axis, and an imaginary axis; and maintaining stability of the variable filter within an operating range by controlling the adjustable resonator and the adjustable gain block such that, in the Cartesian s-plane, the resonator response curve satisfies an orthogonality stability condition.