公开(公告)号：EP0707379A1

公开(公告)日：1996-04-17

申请号：EP94202939.8

申请日：1994-10-11

申请人： BELL TELEPHONE MANUFACTURING COMPANY Naamloze Vennootschap

发明人： Sevenhans, Joannes Mathilda Josephus ,  Duvivier, Eric ,  Sallaerts, Daniel

IPC分类号： H03H11/22

CPC分类号： H03H11/22

摘要： A tunable quadrature phase shifter including two branches each constituted by the cascade connection of a filter, an amplifier and a summing circuit, and two cross-connections constituted by amplifiers interconnecting the filter of one branch to the summing circuit of the opposite branch. An accurate 90 degrees phase shift between the two output signals is obtained by controlling the tail currents of the four amplifiers.
The phase shifter used in mobile telecommunication transceivers may be easily and accurately tuned because the signals used in the summing circuits all have a similar amplitude. It is further adapted to operate with only 3 Volt battery supply as used in wireless phones.
The bandwidth of the amplifiers is increased by using double differential pair amplifiers which behave as cascode arrangements.

摘要翻译： 包括两个分支的可调谐正交移相器，每个分支由滤波器，放大器和求和电路的级联连接构成，以及由将一个分支的滤波器互连到相对分支的求和电路的放大器构成的两个交叉连接。 通过控制四个放大器的尾部电流，可以获得两个输出信号之间精确的90度相移。 用于移动电信收发机的移相器可以容易且准确地调整，因为在求和电路中使用的信号都具有相似的幅度。 它还适用于无线电话中使用的仅3伏电池供电。 通过使用作为共源共栅布置的双差分对放大器来增加放大器的带宽。