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79 条记录 (耗时 0.019 秒)

    Automatic gain control circuit
    2.
    发明公开
    Automatic gain control circuit 有权
    AutomatischeVerstärkungsregelungsschaltung

    公开(公告)号：EP1881601A1

    公开(公告)日：2008-01-23

    申请号：EP07013392.1

    申请日：2007-07-09

    申请人： YAMAHA CORPORATION

    发明人： Tanaka, Yasuomi ,  Tsuji, Nobuaki ,  Kawai, Hirotaka

    IPC分类号： H03G3/00 ,  H03G3/30 ,  H03G7/06

    CPC分类号： H03G3/001 ,  H03G3/3026 ,  H03G7/06

    摘要： A controller 100 updates data LVLm indicative of a level section of an input audio signal and controls a reference level Vr based on a signal CMP representative of a comparison result between the input audio signal and the reference level Vr, and further, controls gains of electronic volumes 10L and 10R in such a manner that these gains become such gains corresponding to the level section of the input audio signal. In this case, the level sections of the input audio signals are related to the gains in such a manner that levels of output signals of the electronic volumes do not exceed a previously set output amplitude upper limit level.

    摘要翻译： 控制器100更新指示输入音频信号的电平部分的数据LVLm，并且基于表示输入音频信号和参考电平Vr之间的比较结果的信号CMP来控制参考电平Vr，并且还控制电子 体积10L和10R，使得这些增益成为对应于输入音频信号的电平部分的这样的增益。 在这种情况下，输入音频信号的电平部分与电子卷的输出信号电平不超过预先设定的输出振幅上限电平的方式与增益相关。

    AMPLIFIER HAVING LINEAR-IN-DB GAIN CONTROL
    4.
    发明授权
    AMPLIFIER HAVING LINEAR-IN-DB GAIN CONTROL 失效
    使用DB-线性增益控制放大器

    公开(公告)号：EP0867067B1

    公开(公告)日：2006-10-18

    申请号：EP96942946.3

    申请日：1996-12-12

    申请人： Analog Devices, Inc.

    发明人： GILBERT, Barrie ,  BRUNNER, Eberhard

    IPC分类号： H03G3/18 ,  H03G7/06

    CPC分类号： H03G7/06

    摘要： A variable gain amplifier (20) uses a differential attenuator (22) to provide a floating, high-impedance differential input to which a differential input signal is applied. The differential attenuator is comprised of (N-1) attenuator stages, with each stage forming a pair of attenuator taps for providing an attenuated version of the differential input signal. Each pair of taps is coupled to the differential inputs of a respective gm stage. The differential outputs of the gm stages are coupled to the differential inputs of a high open-loop gain main amplifier (28). The transconductance of each gm stage is controlled by an interpolator (26) which provides a bias current to each of the gm stages in a sequential manner as a gain control voltage is swept from its minimum to its maximum values. A gain response is produced that is linear-in-dB relative to the gain control voltage.

    AMPLITUDE LIMITATION
    5.
    发明公开
    AMPLITUDE LIMITATION 有权
    限幅

    公开(公告)号：EP1360760A2

    公开(公告)日：2003-11-12

    申请号：EP01962897.3

    申请日：2001-08-01

    申请人： TELEFONAKTIEBOLAGET L M ERICSSON (publ)

    发明人： LIPKA, Dietmar ,  FRANK, Georg ,  KEHLENBACH, Werner ,  GRIMME, Andreas

    IPC分类号： H03G11/00 ,  H03G7/06

    CPC分类号： H03G3/3042

    摘要： In telecommunication devices like power amplifiers for cellular systems the amplitude of a transmission signal has to be limited to avoid signal deterioration. The improve the effciency of such amplitude limiter the present invention proposes to fed the input sample sequence to an estimation filter (56, 57) to determine the actual signal overshoot over a predefined threshold value. By this a clipping control signal to adjust the amplitude of the transmission signal accordingly can be generated with higher accuracy.

    MULTIPLE TIME CONSTANT RECTIFIER APPARATUS AND METHOD
    6.
    发明公开
    MULTIPLE TIME CONSTANT RECTIFIER APPARATUS AND METHOD 审中-公开
    装置和方法多时间常数同一位法官

    公开(公告)号：EP1252712A4

    公开(公告)日：2003-10-22

    申请号：EP00989330

    申请日：2000-12-19

    申请人： ENGINEERING CONSORTIUM INC

    发明人： PINAI HOANG MINH ,  BROWN CLYDE KIP M ,  BECKER ANTHONY J

    IPC分类号： H03G7/06 ,  H03L7/06 ,  H03G1/00 ,  H03L7/089 ,  H04R25/00

    CPC分类号： H03G7/06

    摘要： A rectifier circuit produces an output (Vo) which is a function of the magnitude of the input signal (272) and has a controllable transient response. The circuit requires no rectification diodes. The voltage on a capacitor (230) is sensed and compared with that of an input voltage (Vi). The operation of charging and discharging switches (S1, S2) is adjusted by a control circuit (205) to charge the capacitor if the magnitude of the signal is greater than the capacitor voltage and to discharge the capacitor if the magnitude of the input signal is less than the capacitor voltage. The attack and release function of the rectifier is selectable by limiting the rate at which current charges/discharges the capacitor, preferably with constant current sources (242, 244) comprised of current mirrors.

    An apparatus with RSSI and an electronic circuit including a logarithmic detector
    10.
    发明公开
    An apparatus with RSSI and an electronic circuit including a logarithmic detector 失效
    Anlage mitSignalstärkenindikatorund Schaltungsanordnung mit logaritmischem Detektor。

    公开(公告)号：EP0599399A1

    公开(公告)日：1994-06-01

    申请号：EP93203214.7

    申请日：1993-11-17

    申请人： Philips Electronics N.V.

    发明人： FOTOWAT-AHMADY, ALI ,  Navid, Nasrollah Saeed

    IPC分类号： H03G7/06 ,  H03G7/00

    CPC分类号： H03G7/001 ,  H03G7/06

    摘要： An IF amplifier/log detector with a modular architecture includes a plurality of voltage amplifiers (12,14,16), a plurality of rectifiers (20,22,24), a plurality of voltage-to-current converters (26,28,30) and a current summing circuit (32,34,36). Each amplifier is composed of a first differential transistor (60,62) pair driven by a first current (64) proportional to the temperature to fix the gain. Each converter (26,28,30) includes a second differential transistor pair driven by a current proportional to the temperature and inversely proportional to a process parameter, and comprises a third differential transistor pair driven by a third current inversely proportional to the process parameter. In this manner, a circuit having improved performance with variations in temperature and process parameters is obtained.

    摘要翻译： 具有模块化架构的IF放大器/对数检测器包括多个电压放大器（12,14,16），多个整流器（20,22,24），多个电压 - 电流转换器（26,28， 30）和电流求和电路（32,34,36）。 每个放大器由由固定增益的温度成比例的第一电流（64）驱动的第一差分晶体管（60,62）组成。 每个转换器（26,28,30）包括由与温度成比例的电流驱动的与工艺参数成反比的第二差分晶体管对，并且包括由与工艺参数成反比的第三电流驱动的第三差分晶体管对。 以这种方式，获得了具有改善的温度和工艺参数变化性能的电路。