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    Frequency pulling reduction in wide-band direct conversion transmitters
    4.
    发明授权
    Frequency pulling reduction in wide-band direct conversion transmitters 有权
    宽带直接转换发射机降频

    公开(公告)号：US09088308B2

    公开(公告)日：2015-07-21

    申请号：US13789682

    申请日：2013-03-08

    Applicant: Tensorcom, Inc.

    Inventor： Zaw Soe

    IPC: H04L27/00 ,  H04B1/02

    CPC classification number: H04B1/02 ,  H03D7/165

    Abstract: In an up-converter path of a transmitter, wide-band signal system like direct conversion WiGig, a high pass filter (HPF) is placed in the baseband path after the low pass filter (LPF) but before the mixers. The baseband signal of WiGig can have a bandwidth of 800 MHz. The HPF removes the frequencies from 0-40 MHz from the baseband signal and degrades the overall signal of the baseband by a dB or so. However, the frequency pulling is significantly reduced since oscillator frequency and Radio frequency (RF) transmitter frequencies after conversion become further separated when compared a system using to the conventional approach. This causes the injected signal to fall outside the locking range of the oscillator. The concern of substrate coupling is reduced and allows for a reduction in the physical distance between the oscillator and the mixer and reduces a shift in the desired target frequency of operation.

    Abstract translation: 在发射机的上转换器路径中，像直接转换WiGig这样的宽带信号系统，高通滤波器（HPF）在低通滤波器（LPF）之后但在混频器之前被置于基带路径中。 WiGig的基带信号可以具有800 MHz的带宽。 HPF从基带信号中删除0-40 MHz的频率，并将基带的整体信号降低dB左右。 然而，与使用传统方法的系统进行比较时，振荡器频率和转换后的射频（RF）发射机频率变得更加分离时，频率牵引显着减少。 这会使注入的信号落在振荡器的锁定范围之外。 衬底耦合的问题被减少并且允许减小振荡器和混频器之间的物理距离，并减少所需目标操作频率的偏移。

    High linearly WiGig baseband amplifier with channel select filter
    5.
    发明授权
    High linearly WiGig baseband amplifier with channel select filter 有权

    公开(公告)号：US10734957B2

    公开(公告)日：2020-08-04

    申请号：US16352575

    申请日：2019-03-13

    Applicant: Tensorcom, Inc.

    Inventor： Zaw Soe ,  Kevin Jing ,  Steve Gao

    IPC: H03G5/28 ,  H03H11/12 ,  H03G1/00 ,  H03F3/45

    Abstract: A circuit comprises a Sallen-Key filter, which includes a source follower that implements a unity-gain amplifier; and a programmable-gain amplifier coupled to the Sallen-Key filter. The circuit enables programmable gain via adjustment to a current mirror copying ratio in the programmable-gain amplifier, which decouples the bandwidth of the circuit from its gain settings. The programmable-gain amplifier can comprise a differential voltage-to-current converter, a current mirror pair, and programmable output gain stages. The Sallen-Key filter and at least one branch in the programmable-gain amplifier can comprise transistors arranged in identical circuit configurations.

    High linearly WiGig baseband amplifier with channel select filter
    6.
    发明授权
    High linearly WiGig baseband amplifier with channel select filter 有权

    公开(公告)号：US10277182B2

    公开(公告)日：2019-04-30

    申请号：US15833458

    申请日：2017-12-06

    Applicant: Tensorcom, Inc.

    Inventor： Zaw Soe ,  Kevin Jing ,  Steve Gao

    IPC: H03G1/00 ,  H03H11/12 ,  H03F3/45 ,  H03G5/28

    Abstract: A circuit comprises a Sallen-Key filter, which includes a source follower that implements a unity-gain amplifier; and a programmable-gain amplifier coupled to the Sallen-Key filter. The circuit enables programmable gain via adjustment to a current mirror copying ratio in the programmable-gain amplifier, which decouples the bandwidth of the circuit from its gain settings. The programmable-gain amplifier can comprise a differential voltage-to-current converter, a current mirror pair, and programmable output gain stages. The Sallen-Key filter and at least one branch in the programmable-gain amplifier can comprise transistors arranged in identical circuit configurations.

    Direct coupled biasing circuit for high frequency applications
    7.
    发明授权
    Direct coupled biasing circuit for high frequency applications 有权

    公开(公告)号：US09793880B2

    公开(公告)日：2017-10-17

    申请号：US14828955

    申请日：2015-08-18

    Applicant: Tensorcom, Inc.

    Inventor： Zaw Soe ,  KhongMeng Tham

    IPC: H03K3/012 ,  H01Q1/50 ,  H03K17/56 ,  G05F3/16 ,  H04B5/00

    CPC classification number: H03K3/012 ,  G05F3/16 ,  H01Q1/50 ,  H03K17/56 ,  H04B5/0075

    Abstract: This invention eliminates the need for “capacitor coupling” or “transformer coupling,” and the associated undesirable parasitic capacitance and inductance associated with these coupling techniques when designing high frequency (˜60 GHz) circuits. At this frequency, the distance between two adjacent stages needs to be minimized. A resonant circuit in series with the power or ground leads is used to isolate a biasing signal from a high frequency signal. The introduction of this resonant circuit allows a first stage to be “directly coupled” to a next stage using a metallic trace. The “direct coupling” technique passes both the high frequency signal and the biasing voltage to the next stage. The “direct coupling” approach overcomes the large die area usage when compared to either the “AC coupling” or “transformer coupling” approach since neither capacitors nor transformers are required to transfer the high frequency signals between stages.

    Frequency Pulling Reduction in Wide-Band Direct Conversion Transmitters
    8.
    发明申请
    Frequency Pulling Reduction in Wide-Band Direct Conversion Transmitters 有权
    宽带直接转换发射机中的降频

    公开(公告)号：US20140254710A1

    公开(公告)日：2014-09-11

    申请号：US13789682

    申请日：2013-03-08

    Applicant: TENSORCOM, INC.

    Inventor： Zaw Soe

    IPC: H04L25/03

    CPC classification number: H04B1/02 ,  H03D7/165

    Abstract: In an up-converter path of a transmitter, wide-band signal system like direct. conversion WiGig, a high pass filter (HPF) is placed in the baseband path after the low pass filter (LPF) but before the mixers. The baseband signal of WiGig can have a bandwidth of 800 MHz. The HPF removes the frequencies from 0-40 MHz from the baseband signal and degrades the overall signal of the baseband by a dB or so. However, the frequency pulling is significantly reduced since oscillator frequency and Radio frequency (RF) transmitter frequencies after conversion become further separated when compared a system using to the conventional approach. This causes the injected signal to fall outside the locking range of the oscillator. The concern of substrate coupling is reduced and allows for a reduction in the physical distance between the oscillator and the mixer and reduces a shift in the desired target frequency of operation.

    Abstract translation: 在发射机的上变频器路径中，像直接的宽带信号系统。 转换WiGig，高通滤波器（HPF）放置在低通滤波器（LPF）之后但混频器之前的基带路径中。 WiGig的基带信号可以具有800 MHz的带宽。 HPF从基带信号中删除0-40 MHz的频率，并将基带的整体信号降低dB左右。 然而，与使用传统方法的系统进行比较时，振荡器频率和转换后的射频（RF）发射机频率变得更加分离时，频率牵引显着减少。 这会使注入的信号落在振荡器的锁定范围之外。 衬底耦合的问题被减少并且允许减小振荡器和混频器之间的物理距离，并减少所需目标操作频率的偏移。

    GILBERT MIXER WITH NEGATIVE GM TO INCREASE NMOS MIXER CONVERSION
    9.
    发明申请
    GILBERT MIXER WITH NEGATIVE GM TO INCREASE NMOS MIXER CONVERSION 有权
    GILBERT混合器与负极GM增加NMOS混合器转换

    公开(公告)号：US20140253216A1

    公开(公告)日：2014-09-11

    申请号：US13789681

    申请日：2013-03-08

    Applicant: TENSORCOM, INC.

    Inventor： Zaw Soe ,  Tham KhongMeng

    IPC: G06G7/16

    CPC classification number: G06G7/16 ,  H03D7/1441 ,  H03D7/1458 ,  H03D7/165 ,  H03D2200/0019

    Abstract: A cross coupled NMOS transistors providing a negative gm transistor feedback allows a mixer to saturate at a reduced input signal swing voltage when compared to a conventional mixer allowing the mixer to enter into the current mode operation at a reduced signal input voltage range. The linearity of the baseband signal path can be traded against the mixer gain and is improved if the signal swing in the baseband signal path is reduced. The input mixer transistors operate in the saturated mode at a reduced input signal swing voltage causing the power efficiency of the system to increase since the transmit chain operates at a class-D power efficient. Efficiency is very important in mobile applications to save and extend the battery power of a mobile phone providing a better utilization of the available power since most of that power is supplied to the energy of the outgoing modulated signal.

    Abstract translation: 提供负gm晶体管反馈的交叉耦合NMOS晶体管使混频器能够与传统的混频器相比，作为降低的输入信号摆幅电压饱和，从而允许混频器在降低的信号输入电压范围内进入电流模式操作。 基带信号路径的线性度可以抵抗混频器增益进行交易，如果基带信号路径中的信号摆幅减小，则可以得到改善。 输入混频器晶体管以降低的输入信号摆幅电压在饱和模式下工作，导致系统的功率效率增加，因为发射链以D类功率有效工作。 在移动应用中，效率对于节省和扩展移动电话的电池电力是非常重要的，其提供了对可用功率的更好的利用，因为大部分功率被提供给输出调制信号的能量。

    Method and apparatus to detect LO leakage and image rejection using a single transistor
    10.
    发明授权
    Method and apparatus to detect LO leakage and image rejection using a single transistor 有权

    公开(公告)号：US10103757B2

    公开(公告)日：2018-10-16

    申请号：US15505444

    申请日：2015-08-25

    Applicant: Tensorcom, Inc.

    Inventor： KhongMeng Tham ,  Huainan Ma ,  Zaw Soe ,  Ricky Lap Kei Cheung

    IPC: H04B1/04 ,  H03D7/12

    Abstract: Local oscillator (LO) leakage and Image are common and undesirable effects in typical transmitters. Typically, fairly complex hardware and algorithms are used to calibrate and reduce these impairments. A single transistor that draws essentially no dc current and occupies a very small area detects the LO leakage and Image signals. The single transistor operating as a square-law device is used to mix the signals at the input and output ports of a power amplifier. The mixed signal generated by the single transistor enables the simultaneous calibration of the LO leakage and Image Rejection.

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