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    IMPROVED LINEARITY IN PASSIVE MIXER CIRCUITS
    1.
    发明公开
    IMPROVED LINEARITY IN PASSIVE MIXER CIRCUITS 审中-公开
    改善线性无源混频器电路

    公开(公告)号：EP2878077A1

    公开(公告)日：2015-06-03

    申请号：EP13752962.4

    申请日：2013-07-26

    申请人： Qualcomm Incorporated

    发明人： GAN, Haitao ,  LI, Xiaoyong

    IPC分类号： H03D3/00 ,  H03D7/14 ,  H03D7/16

    摘要： A circuit used in a mixer configured to receive a signal made up of a relatively small modulation signal and a relatively large carrier signal is described. The mixer includes multiple switches. A balancing circuit configured to receive a supply voltage and a clocking signal is provided, and the balancing circuit provides a control signal to a switch in the mixer. The balancing circuit includes a capacitor configured to receive and selectively dissipate charge as a gate voltage along a gate path. The control signal causes switching of the switch in the mixer at times in accordance with the clocking signal according to a voltage difference value between a source voltage and the gate voltage, wherein the voltage difference value between the source voltage and the gate voltage is approximately a predetermined voltage value greater than a turn on voltage level of the switch.

    COMMON-GATE COMMON-SOURCE AMPLIFIER
    4.
    发明公开
    COMMON-GATE COMMON-SOURCE AMPLIFIER 有权
    具有共同门和共源放大器

    公开(公告)号：EP2409400A2

    公开(公告)日：2012-01-25

    申请号：EP10711497.7

    申请日：2010-03-18

    申请人： QUALCOMM Incorporated

    发明人： LI, Xiaoyong ,  APTE, Rahul A.

    IPC分类号： H03F1/26 ,  H03F3/193 ,  H03F3/45

    CPC分类号： H03F3/193 ,  H03F1/26 ,  H03F3/3022 ,  H03F3/45179

    摘要： Techniques for integrating a common-source and common-gate amplifier topology in a single amplifier design. In one aspect, an input voltage is provided to both a common- source amplifier and a common-gate amplifier. The output voltages of the common- source amplifier and the common-gate amplifier are provided to a difference block for generating a single-ended voltage proportional to the difference between the output voltages. When applied to the design of, e.g., low-noise amplifiers (LNA's), the disclosed techniques may offer improved noise performance over the prior art.

    TECHNIQUES FOR IMPROVING AMPLIFIER LINEARITY
    5.
    发明公开
    TECHNIQUES FOR IMPROVING AMPLIFIER LINEARITY 有权
    技术用于改善放大器的线性

    公开(公告)号：EP2377241A1

    公开(公告)日：2011-10-19

    申请号：EP09793667.8

    申请日：2009-12-11

    申请人： QUALCOMM Incorporated

    发明人： LI, Xiaoyong ,  LEE, Sang-Oh ,  CONROY, Cormac S.

    IPC分类号： H03F1/22 ,  H03F1/32 ,  H03F3/19 ,  H03F3/21

    CPC分类号： H03F1/223 ,  H03F1/3205 ,  H03F3/19 ,  H03F3/211 ,  H03F2200/168 ,  H03F2200/294 ,  H03F2200/456 ,  H03F2200/492

    摘要： Techniques for improving the linearity of a cascode amplifier. In an exemplary embodiment, an auxiliary common-gate amplifier (M5) is provided in parallel with the principal cascode branch (M2). The auxiliary common-gate amplifier (M5) samples a cascoded node (Xl) in the principal cascode branch (M2). The auxiliary common-gate amplifier (M5) generates a current which, when combined with the current generated by the principal cascode branch (M2), cancels a distortion component to generate an output current with improved linearity characteristics. In an exemplary embodiment, a phase shifting network (310) couples the cascoded node (X1) to the auxiliary common-gate amplifier (M5), and may include, e.g., a capacitor coupled to an inductor. Techniques for improving the linearity of a cascode amplifier. In an exemplary embodiment, an auxiliary common-gate amplifier (M5) is provided in parallel with the principal cascode branch (M2). The auxiliary common-gate amplifier (M5) samples a cascoded node (X1) in the principal cascode branch (M2). The auxiliary common-gate amplifier (M5) generates a current which, when combined with the current generated by the principal cascode branch (M2), cancels a distortion component to generate an output current with improved linearity characteristics.

    USING LO SHIFTING TO PREVENT A LOCAL TRANSCEIVER FROM INTERFERING WITH AN FM RADIO
    9.
    发明公开
    USING LO SHIFTING TO PREVENT A LOCAL TRANSCEIVER FROM INTERFERING WITH AN FM RADIO 审中-公开
    LOKALOSZILLATORVERSHIEBUNG为防止产生的FM接收器收发器问题

    公开(公告)号：EP2452439A1

    公开(公告)日：2012-05-16

    申请号：EP10733091.2

    申请日：2010-07-08

    申请人： Qualcomm Incorporated

    发明人： TRIKHA, Pushp, K. ,  BLESSENT, Luca ,  LI, Xiaoyong ,  APTE, Rahul, A.

    IPC分类号： H04B1/10 ,  H04B1/14 ,  H04B1/38 ,  H04B15/04

    CPC分类号： H04B1/1036 ,  H04B1/14 ,  H04B1/3805 ,  H04B15/04

    摘要： A cellular telephone includes cellular telephone circuitry and an FM receiver. An FM signal being received is downconverted by a mixer. The downconverted signal is processed to generate an FM signal that is supplied to a digital IF filter. If a blocker emitted by the cellular telephone circuitry would interfere with receiving of the FM signal due to interaction of an LO harmonic with the blocker if a conventional LO frequency were used, then a different LO frequency is used. Subsequent processing of the downconverted FM signal (for example, by a digital complex conjugate selector and an IF rotator) results in the signal supplied to the digital IF filter having the same center frequency as the digital IF filter despite the use of the different LO frequency. In some embodiments, the LO is shifted by different amounts depending on cellular telephone mode and on the FM signal.