Differenzverstärker
    5.
    发明公开

    公开(公告)号:EP0902533A1

    公开(公告)日:1999-03-17

    申请号:EP98115413.1

    申请日:1998-08-14

    IPC分类号: H03F3/45

    摘要: Zur Verbesserung des Rauschens, der Linearität und der Gleichtaktunterdrückung bei einem Differenzverstärker, weist dieser zwei Transistoren (Tl, Tl'), zwei Differenzverstärkereingänge (E, E'), die auf die Steuereingänge der Transistoren (Tl, Tl') führen, und zwei Induktivitäten (L, L') auf. Die beiden Induktivitäten (L, L') sind magnetisch miteinander gekoppelt, und verbinden die beiden Transistoren (Tl, Tl') mit einem Bezugspotential (M). Die Differenzverstärkerausgänge (A, A') sind mit den Ausgangskreisen der Transistoren (Tl, T1') verbunden. Ferner können die beiden Induktivitäten über eine Koppelkondensator (C) miteinander verbunden sein.

    摘要翻译: 差分放大器具有耦合到相应晶体管(T1,T1')的控制输入的一对差分输入(E,E')。 具有相等电感值的一对电感器(L,L')连接到晶体管的发射器电路,并且在另一侧共同耦合到参考电位(M)。 差分放大器输出(A,A')从晶体管的输出电路耦合,电阻器(R2,R2')插入在每个电感器和公共参考电位节点之间。

    Differential amplifier with signal-dependent quiescent current control
    8.
    发明公开
    Differential amplifier with signal-dependent quiescent current control 失效
    具有信号依赖性电流控制的差分放大器

    公开(公告)号:EP0507388A3

    公开(公告)日:1993-01-13

    申请号:EP92200871.9

    申请日:1992-03-27

    IPC分类号: H03F3/45

    摘要: Differential amplifier with signal-dependent quiescent current control, comprising:
    a first (T₁) and a second (T₂) transistor of the same conductivity type for conducting a first (I₁) and a second (I₂) current respectively, the two transistors comprising each a control electrode coupled to a first (6) and a second (8) input terminal respectively, for feeding an input signal, a first main electrode coupled to a common terminal (3), converting means (10A, 10B) for converting the first and the second current to a measuring current in response to the first and the second current, comparing means comprising a control output terminal (11) for presenting a signal (I S ) in response to the difference between the measuring current and the reference current (2I Q ) of a reference current source (14), a controllable quiescent current source (4) coupled to the common terminal (3) for presenting a quiescent current (I O ) at the common terminal and having, coupled to the control output terminal (11), a control input (5) for controlling the quiescent current (I₀), whilst the converting means comprise:
    a first/second current generator (10A/10B) for generating a first/second derived current (I A /I B ) which decreases if the first second current (I₁/I₂) increases and vice versa , combining means (11) for generating the measuring current by adding together the first (I A ) and second (I B ) derived currents. Due to the inverse characteristic of the first/second current generator, the measuring current will be increasingly more dominated by the smaller of the first and second currents in the event of an increasing input signal, so that the minimum value of the smaller current will be determined by the reference current. Generating the first and second derived currents and combining them to the measuring current is a continuous process and can therefore react fast to amplitude variations in the first and second currents.

    摘要翻译: 具有信号依赖静态电流控制的差分放大器,包括:分别用于传导第一(I1)和第二(I2)电流的相同导电类型的第一(T1)和第二(T2)晶体管, 分别耦合到第一输入端(6)和第二输入端(8)的控制电极,用于馈送输入信号;耦合到公共端子(3)的第一主电极,转换装置(10A,10B) 和响应于第一和第二电流的测量电流的第二电流,比较装置包括用于响应于测量电流和参考电流(2IQ)之间的差异呈现信号(IS)的控制输出端子(11) ),耦合到所述公共端子(3)的可控静态电流源(4),用于在所述公共端子处呈现静态电流(IO),并且具有耦合到所述控制输出端子(11)的参考电流源(14) ,ac 用于控制静态电流(I0)的控制输入(5),而转换装置包括:用于产生第一/第二导出电流(IA / IB)的第一/第二电流发生器(10A / 10B),如果第一秒 电流(I1 / I2)增加,反之亦然,用于通过将第一(IA)和第二(IB)导出的电流相加在一起而产生测量电流的组合装置(11)。 由于第一/第二电流发生器的反向特性,在输入信号增加的情况下,测量电流将越来越多地被第一和第二电流的较小者所主导,因此较小电流的最小值将为 由参考电流决定。 产生第一和第二导出电流并将它们组合到测量电流是连续的过程,因此可以快速响应第一和第二电流中的幅度变化。

    Cascaded amplifier
    10.
    发明公开
    Cascaded amplifier 失效
    Verstärkerkaskade。

    公开(公告)号:EP0633657A2

    公开(公告)日:1995-01-11

    申请号:EP94201874.8

    申请日:1994-06-29

    IPC分类号: H03F3/45 H03F3/347 H03G7/00

    摘要: A cascaded amplifier is comprised of a number of amplifying stages connected in cascade such as the dual emitter-coupled amplifier shown. A first pair of transistors (14,20) provides limiting amplification and a second pair of transistors (16,18) with degeneration (22,24) provide linear amplification. Each pair of transistors is driven by a current source (28,26) which supplies a current (IT, IT2) proportional to absolute temperature (PTAT). The small signal amplification is then substantially independent of temperature and the value of the limited output is proportional to absolute temperature. This latter effect is countered by including a translinear variable current gain amplifier (54,56,58,60) in the last dual-gain stage of the cascaded amplifier to modify the output voltage in a manner inversely proportional to absolute temperature. A transfer function may thus be provided which is substantially independent of temperature.

    摘要翻译: 级联放大器由串联连接的多个放大级组成,例如所示的双发射极耦合放大器。 第一对晶体管(14,20)提供限制放大,并且具有退化(22,24)的第二对晶体管(16,18)提供线性放大。 每对晶体管由电流源(28,26)驱动,电流源(28,26)提供与绝对温度(PTAT)成比例的电流(IT,IT2)。 然后,小信号放大器基本上与温度无关,并且有限输出的值与绝对温度成比例。 通过在级联放大器的最后一个双增益级中包括一个跨线性可变电流增益放大器(54,56,58,60)来以与绝对温度成反比的方式修改输出电压来抵消后一种影响。 因此可以提供基本上与温度无关的传递函数。