中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

5 records (took 0.051 seconds)

    Rf receiver
    3.
    发明专利
    Rf receiver 有权
    射频接收器

    公开(公告)号：JP2009182589A

    公开(公告)日：2009-08-13

    申请号：JP2008019026

    申请日：2008-01-30

    Applicant: Oki Semiconductor Co Ltd ,  Okiセミコンダクタ株式会社

    Inventor： AKAHORI HIROTSUGU

    IPC: H04B1/16 ,  H03G3/20 ,  H04B1/26

    CPC classification number: H03G3/3068 ,  H03G2201/204 ,  H03G2201/206 ,  H03G2201/305 ,  H03G2201/307

    Abstract: PROBLEM TO BE SOLVED: To provide an RF receiver capable of controlling the signal component of a desired channel at a proper level without saturating a high-frequency amplifying stage. SOLUTION: The RF receiver has an RF amplifying means amplifying a received high-frequency signal, a mixing means converting the output high-frequency signal of the RF amplifying means into an intermediate-frequency signal and an IF amplifying means amplifying the output intermediate-frequency signal of the mixing means. The RF receiver further has a first level detecting means detecting the signal level of the output high-frequency signal of the RF amplifying means, a second level detecting means detecting the signal level of the output intermediate-frequency signal of the mixing means and a third level detecting means detecting the signal level of the intermediate-frequency signal amplified by the IF amplifying means. The RF receiver further has an RF reference-level generating means generating an RF reference level on the basis of at least one of the detecting-signal levels of the first and second level detecting means and an RF-gain control means controlling the amplifying gain of the RF amplifying means so that a value corresponding to the detecting-signal level of the third level detecting means is equalized to the RF reference level. COPYRIGHT: (C)2009,JPO&INPIT

    Abstract translation: 要解决的问题：提供一种RF接收器，其能够在不使饱和高频放大级的情况下以适当的电平来控制期望信道的信号分量。 解决方案：RF接收机具有放大接收到的高频信号的RF放大装置，将RF放大装置的输出高频信号转换为中频信号的混合装置和放大输出的IF放大装置 混合装置的中频信号。 RF接收机还具有检测RF放大装置的输出高频信号的信号电平的第一电平检测装置，检测混频装置的输出中频信号的信号电平的第二电平检测装置和第三电平检测装置 检测由IF放大装置放大的中频信号的信号电平的电平检测装置。 RF接收机还具有基于第一和第二电平检测装置的检测信号电平中的至少一个产生RF参考电平的RF参考电平发生装置和控制第一和第二电平检测装置的放大增益的RF增益控制装置 RF放大装置使得与第三电平检测装置的检测信号电平对应的值与RF参考电平相等。 版权所有（C）2009，JPO＆INPIT

    Agc circuit
    5.
    发明专利
    Agc circuit 有权
    AGC电路

    公开(公告)号：JP2005295471A

    公开(公告)日：2005-10-20

    申请号：JP2004111692

    申请日：2004-04-06

    Applicant: Sony Corp ,  ソニー株式会社

    Inventor： OKASHIN YAMATO

    IPC: H03G3/20 ,  H03G1/00 ,  H03G3/30 ,  H03G7/00 ,  H04B1/06 ,  H04B1/10 ,  H04B1/16 ,  H04B7/00 ,  H04B17/40

    CPC classification number: H03G3/3068 ,  H03G1/0023 ,  H03G1/0088 ,  H03G7/001 ,  H03G2201/103 ,  H03G2201/204 ,  H03G2201/305 ,  H03G2201/307 ,  H03G2201/506

    Abstract: PROBLEM TO BE SOLVED: To realize appropriate AGC for a desired wave signal and an interference wave signal. SOLUTION: There are provided attenuator circuits 42-44 cascade-connected to a received signal SRX and differential amplifiers 51-54 to which the received signal SRX and output signals of the attenuator circuits 42-44 are supplied, respectively. There are also provided resistors R55, R56 connected in common to output terminals of the differential amplifiers 51-54 so as to extract level-controlled output signals and a control current generating circuit 34 for generating control currents I51-I54 of predetermined characteristics from first and second AGC voltages VAGC, VOL. The control currents I51-I54 outputted from the control current generating circuit 34 are supplied to the differential amplifiers 51-54 as their operation switching and gain control signals. A control current Im equal to the control currents I51-I54 is negatively fed back by the control current generating circuit 34. COPYRIGHT: (C)2006,JPO&NCIPI

    Abstract translation: 要解决的问题：为所需波信号和干扰波信号实现适当的AGC。 提供了分别与接收信号SRX和差分放大器51-54级联的衰减器电路42-44，差分放大器51-54分别向其提供接收信号SRX和衰减器电路42-44的输出信号。 还提供了电阻R55，R56共同连接到差分放大器51-54的输出端，以便提取电平控制的输出信号;以及控制电流产生电路34，用于产生从第一和第一预定特性的控制电流I51-154; 第二AGC电压VAGC，VOL。 从控制电流产生电路34输出的控制电流I51-I54作为其操作切换和增益控制信号被提供给差分放大器51-54。 与控制电流I51〜I54相等的控制电流Im1由控制电流产生电路34负反馈。（C）2006，JPO＆NCIPI

Patent Agency Ranking