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    • 3. 发明申请
    • QUADRATURE-INPUT QUADRATURE-OUTPUT DIVIDER AND PHASE LOCKED LOOP, FREQUENCY SYNTHESISER OR SINGLE SIDE BAND MIXER
    • 正交输入正交输出分路器和相位锁定环路,频率合成器或单边带混频器
    • WO2009033420A1
    • 2009-03-19
    • PCT/CN2008/072303
    • 2008-09-09
    • THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGYLUONG, Howard CamZHENG, Hui
    • LUONG, Howard CamZHENG, Hui
    • H03L7/08
    • H03K3/356139H03B19/00H03B27/00H03L7/18
    • The present invention relates to a quadrature divider which may be used in a phase locked loop or frequency synthesiser or with a single side band mixer. According to a preferred embodiment the divider takes a quadrature input and has a quadrature output. The divider has four analog mixers 1, 2, 3 and 4. The first two mixers 1, 2 take the in-phase quadrature input, while the second mixers 3, 4 take the quadrature-phase quadrature input. The outputs and feedback loops of the mixers are properly arranged such that the in-phase and quadrature-phase outputs of the divider have a determinisitic phase sequence relationship based on the phase sequence relationship of the corresponding quadrature inputs. Third order harmonics may be minimised or reduced by addition or subtraction of the mixer outputs. As the divider is able to take a quadrature input, there is no need for a dummy divider in the phase locked loop, thus saving space and power.
    • 本发明涉及可用于锁相环或频率合成器或单边带混频器的正交分频器。 根据优选实施例,分频器采用正交输入并具有正交输出。 分频器具有四个模拟混频器1,2,3和4.前两个混频器1,2采用同相正交输入,而第二混频器3,4采用正交相位正交输入。 混合器的输出和反馈环路被适当地布置,使得除法器的同相和正交相位输出基于相应的正交输入的相位序列关系具有确定性的相位序列关系。 通过加减混频器输出可以最小化或减少三阶谐波。 由于分压器能够进行正交输入,因此在锁相环中不需要虚拟分频器,因此节省了空间和功率。