公开(公告)号：US4450584A

公开(公告)日：1984-05-22

申请号：US392158

申请日：1982-06-25

申请人： Hiroshi Saka ,  Toshihide Tanaka

发明人： Hiroshi Saka ,  Toshihide Tanaka

IPC分类号： H03D9/06 ,  H04B1/26

CPC分类号： H03D9/0633 ,  H03D2200/0037

摘要： In a mixer using a planar circuit such as a strip line or a microstrip line etc., an IF signal interruption circuit which passes an RF signal but exhibits an open-circuit impedance against an IF signal is provided in shunt with a main line on which the RF signal propagates toward a mixer diode, and a low-pass filter is connected in the vicinity of the IF signal interruption circuit in order to short-circuit a mount point of the diode for the IF signal by high frequency short-circuiting technique wherein an open-ended quarter-wavelength transmission line or a short-circuited half-wavelength transmission line is used, whereby low noise performance can be obtained over a wide frequency band even under such an operating condition that the IF signal is in the GHz band.

摘要翻译： 在使用诸如带状线或微带线等平面电路的混频器中，提供通过RF信号但呈现针对IF信号的开路阻抗的IF信号中断电路与其上的主线分流 RF信号向混频器二极管传播，并且在IF信号中断电路附近连接低通滤波器，以便通过高频短路技术使IF信号的二极管的安装点短路，其中， 使用开放四分之一波长的发射线路或短路半波长传输线路，即使在IF信号处于GHz频带的操作条件下也可以在宽频带上获得低噪声性能。

公开(公告)号：US3947629A

公开(公告)日：1976-03-30

申请号：US583855

申请日：1975-06-04

申请人： Toshihide Tanaka ,  Seiji Fujisawa ,  Susumu Ide

发明人： Toshihide Tanaka ,  Seiji Fujisawa ,  Susumu Ide

IPC分类号： H03D7/12 ,  H04N5/44 ,  H04B1/16

CPC分类号： H04N5/4446 ,  H03D7/12

摘要： A television receiver comprising a first printed circuit board having a helical resonator filter, an adjacent channel trap circuit and an impedance converter circuit for providing a reduced output impedance, the first printed circuit board being secured to the tuner casing, and a second printed circuit board having first and subsequent i-f amplifier stages, the two printed circuit boards being connected to each other, whereby good skirt characteristics can be simply obtained. Also, no overall adjustment is required but the tuner and i-f amplifier may be adjusted separately, thus providing improved serviceability.

摘要翻译： 一种电视接收机，包括具有螺旋谐振滤波器的第一印刷电路板，相邻通道陷波电路和用于提供减小的输出阻抗的阻抗转换器电路，所述第一印刷电路板固定到调谐器壳体，以及第二印刷电路板 如果放大器级具有第一和随后的情况，则两个印刷电路板彼此连接，从而可以简单地获得良好的裙部特性。 此外，不需要进行整体调整，但可以分别调整调谐器和i-f放大器，从而提供改进的可维护性。