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2. 发明授权

US06121809A Accurate and tuneable active differential phase splitters in RFIC wireless applications 有权
标题翻译： RFIC无线应用中精确和可调谐的有源差分相位分离器
公开(公告)号：US06121809A
公开(公告)日：2000-09-19
申请号：US270906
申请日：1999-03-15
申请人： Huainan Ma , Sher Jiun Fang , Fujiang Lin
发明人： Huainan Ma , Sher Jiun Fang , Fujiang Lin
IPC分类号： H03F3/26 , H03K5/151 , H03K5/13
CPC分类号： H03K5/151 , H03F3/265
摘要： A differential phase splitter circuit for producing opposite phase signals from an input AC signal is provided. A first and second transistor is provided. The source of these transistors are connected to a common first node. Further, these transistors act as a differential amplifier. The gate of the first transistor receives an input AC signal. The drain of the first transistor produces a first output AC signal. Similarly, the drain of the second transistor produces a second output AC signal that is 180 degrees out of phase with the first output AC signal. A source resistor is provided, connected in series to the common first node and ground. Lastly, an LCR feedback circuit is provided. This feedback circuit is connected between the drain of the first transistor and the gate of the second transistor. The LCR feedback circuit couples at least a fraction of the amplitude of the first output AC signal to the gate of the second transistor for amplitude balancing and phase balancing. This compensates for an unequal division of the input signal between the first and second transistor due to the finite impedance value of the source resistor. The LCR feedback circuit may include an active element for modifying the phase and amplitude balance of the two output AC signals. The active element may be adjusted using a control voltage.
摘要翻译：提供了用于从输入AC信号产生相反相位信号的差分相位分离器电路。提供第一和第二晶体管。这些晶体管的源极连接到公共第一节点。此外，这些晶体管用作差分放大器。第一晶体管的栅极接收输入AC信号。第一晶体管的漏极产生第一输出AC信号。类似地，第二晶体管的漏极产生与第一输出AC信号180度异相的第二输出AC信号。提供源电阻，串联连接到公共第一节点和地。最后，提供LCR反馈电路。该反馈电路连接在第一晶体管的漏极和第二晶体管的栅极之间。 LCR反馈电路将第一输出AC信号的幅度的至少一部分耦合到第二晶体管的栅极用于幅度平衡和相位平衡。这由于源极电阻的有限阻抗值而补偿了第一和第二晶体管之间的输入信号的不相等。 LCR反馈电路可以包括用于修改两个输出AC信号的相位和幅度平衡的有源元件。可以使用控制电压来调节有源元件。

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