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US08687968B2 Vector sum phase shifter, optical transceiver, and control circuit 有权
矢量和移相器，光收发器和控制电路

Vector sum phase shifter, optical transceiver, and control circuit
Abstract:
A vector sum phase shifter includes a 90° phase shifter (1) which generates an in-phase signal (VINI) and a quadrature signal (VINQ) from an input signal (VIN), a four-quadrant multiplier (2I) which changes the amplitude of the in-phase signal (VINI) based on a control signal (CI), a four-quadrant multiplier (2Q) which changes the amplitude of the quadrature signal (VINQ) based on a control signal (CQ), a combiner (3) which combines the in-phase signal (VINI) and the quadrature signal (VINQ), and a control circuit (4). The control circuit (4) includes a voltage generator which generates a reference voltage, and a differential amplifier which outputs the difference signal between a control voltage (VC) and the reference voltage as the control signal (CI, CQ). The differential amplifier performs an analog operation of converting the control voltage (VC) into the control signal (CI, CQ) similar to a sine wave or a cosine wave.
Abstract(Chinese):

矢量和移相器包括从输入信号（VIN）产生同相信号（VINI）和正交信号（VINQ）的90°移相器（1），四象限乘法器（2I），其改变 基于控制信号（CI）的同相信号（VINI）的幅度，基于控制信号（CQ）改变正交信号（VINQ）的幅度的四象限乘法器（2Q），组合器 3），其组合了同相信号（VINI）和正交信号（VINQ），以及控制电路（4）。 控制电路（4）包括产生参考电压的电压发生器和输出控制电压（VC）和基准电压之间的差分信号作为控制信号（CI，CQ）的差分放大器。 差分放大器进行与正弦波或余弦波相似的将控制电压（VC）转换为控制信号（CI，CQ）的模拟操作。

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