公开(公告)号：US5852603A

公开(公告)日：1998-12-22

申请号：US806439

申请日：1997-02-26

申请人： Kari Lehtinen ,  Mikko Pesola

发明人： Kari Lehtinen ,  Mikko Pesola

IPC分类号： H04B1/40 ,  H04J3/00

CPC分类号： H04B1/005 ,  H04B1/406

摘要： A transceiver is described which in a FDD mode of operation receives at a first frequency (F1) and transmits at a second frequency (F2); and in a TDD mode of operation receives and transmits at a third frequency (F3). The transceiver incorporates in a receiving branch at least a first mixer for forming a first intermediate frequency (IF1) from a received frequency (F1, F3) and a first local oscillator frequency (LO1); and a second mixer for forming a second intermediate frequency (IF2) from the first intermediate frequency (IF1) and the second local oscillator frequency (LO2). In a transmission branch the transceiver includes a modulator for modulating signals to be transmitted (TXI, TXQ) to a third intermediate frequency (IF3); a third mixer (16) for forming a transmission frequency (F2, F3) from a third intermediate frequency (IF3) and a fourth local oscillator frequency (LO4). Also included is a first synthesizer for forming equally high first and fourth local oscillator frequencies (LO1, LO4), and a second synthesizer and a frequency multiplier or divider and a switching arrangement for forming and switching a fourth frequency (FS) and its M times multiple (M*FS) such that the fourth frequency (FS) is an absolute value of the difference between the reception frequency (F1) and the transmission frequency (F2) of the FDD mode of operation divided by (M-1).

摘要翻译： 描述了在FDD操作模式中以第一频率（F1）接收并以第二频率（F2）发送的收发器; 并且在TDD操作模式中以第三频率（F3）接收和发送。 所述收发机至少包括用于从接收频率（F1，F3）和第一本地振荡器频率（LO1）形成第一中频（IF1）的第一混频器的接收分支; 以及用于从第一中频（IF1）和第二本机振荡频率（LO2）形成第二中频（IF2）的第二混频器。 在传输分支中，收发器包括用于将要发送的信号（TXI，TXQ）调制到第三中频（IF3）的调制器。 用于从第三中频（IF3）和第四本机振荡频率（LO4）形成发送频率（F2，F3）的第三混频器（16）。 还包括用于形成同样高的第一和第四本地振荡器频率（LO1，LO4）的第一合成器和用于形成和切换第四频率（FS）的第二合成器和倍频器或分频器和用于形成和切换其M次的开关装置 多个（M * FS），使得第四频率（FS）是FDD操作模式除以（M-1）的接收频率（F1）和发送频率（F2）之间的差的绝对值。

公开(公告)号：US06374093B1

公开(公告)日：2002-04-16

申请号：US08330972

申请日：1994-10-28

申请人： Mikko Pesola

发明人： Mikko Pesola

IPC分类号： H04B118

CPC分类号： H04B1/26 ,  H03D7/18

摘要： The circuit arrangement utilizes both outputs of a mixer attenuating the image frequency, whereby one of the desired frequency bands is obtained from a “signal port” and the other desired frequency band from the “port of the image signal”. Thus a desired intermediate frequency signal band (IF) corresponding to the radio frequency Input signal (RF) can be selected using a switch (24), the intermediate frequency signal band (IF) being filtered by an intermediate frequency filter (20, 22). The frequency (LO) of the local oscillator is selected to be in the middle of the radio bands (RF).

摘要翻译： 该电路装置利用两个衰减图像频率的混频器的输出，从而从“信号端口”获取一个期望的频带，并从“图像信号的端口”获得另一个期望的频带。 因此，可以使用开关（24）选择对应于射频输入信号（RF）的所需中频信号频带（IF），中频信号频带（IF）由中频滤波器（20,22）滤波， 。 本地振荡器的频率（LO）选择在无线电频带（RF）的中间。

公开(公告)号：US06014551A

公开(公告)日：2000-01-11

申请号：US893952

申请日：1997-07-16

申请人： Mikko Pesola ,  Kari T. Lehtinen

发明人： Mikko Pesola ,  Kari T. Lehtinen

IPC分类号： H04B1/40 ,  H04B1/52 ,  H04B1/56 ,  H04B1/44

CPC分类号： H04B1/525 ,  H04B1/406 ,  H04B1/56

摘要： The present invention relates to an arrangement for transmitting a radio-frequency signal at two different frequency bands and for receiving at two different frequency bands. The arrangement can be applied for instance to a transceiver of a radio communications system operating at two different frequency bands, or to a transceiver meant to be used in connection with two different radio communications systems. One of the ideas of the invention is that one and the same filter (72), belonging to the RF front end of the antenna circuit, is used for filtering interference from at least two signals located at different frequency bands, in which case the number of filters (72, 75) can be reduced. By means of the solution suggested in the invention, also the number of controllable switches (73) provided on the signal path of the RF front end can be minimized.

摘要翻译： 本发明涉及一种用于在两个不同频带发送射频信号并用于在两个不同频带接收的装置。 该装置可以应用于例如在两个不同频带上操作的无线电通信系统的收发机，或者应用于意图与两个不同的无线电通信系统结合使用的收发机。 本发明的一个想法是属于天线电路的RF前端的同一个滤波器（72）用于对位于不同频带的至少两个信号的干扰进行滤波，在这种情况下，数字 的过滤器（72,75）。 借助于本发明中提出的解决方案，可以将设在RF前端的信号路径上的可控开关（73）的数目减到最小。

公开(公告)号：US5164884A

公开(公告)日：1992-11-17

申请号：US662760

申请日：1991-02-28

申请人： Mikko Pesola

发明人： Mikko Pesola

IPC分类号： H01L23/36 ,  H01L23/373 ,  H05K1/02

CPC分类号： H05K1/0209 ,  H01L23/36 ,  H01L23/3731 ,  H01L23/3738 ,  H01L2924/0002 ,  H01L2924/3011 ,  H04B1/036 ,  H05K2201/066 ,  H05K2201/09781 ,  H05K2201/10166

摘要： The invention relates to a cooling construction for cooling a power transistor (4) having a plastic encapsulation, wherein the waste heat produced is conducted away mainly via the collector lead (6), the collector lead being connected to the collector strip (3) on the circuit board. When it is desired to conduct the produced waste heat specifically on the component side of the circuit board (1), it is possible to use a construction according to the invention in which there is placed on the circuit board (1) a highly heat conductive insulation plate (8) which covers the collector strip (3) entirely over part of its length next to the transistor (4), and that to the insulation plate (8) there is fixed a cooling plate (9) to which the thermal energy produced in the transistor is conducted. The insulation plate (8) may in part also extend on top of the plastic encapsulation of the transistor.