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31. 发明公开

EP0157447A1 Differential amplifier 失效
标题翻译：差分放大器
公开(公告)号：EP0157447A1
公开(公告)日：1985-10-09
申请号：EP85200348.2
申请日：1985-03-11
申请人： Philips Electronics N.V.
发明人： Seevinck, Evert
IPC分类号： H03F3/45
CPC分类号： H03F3/45085 , H03F2203/45392 , H03F2203/45454 , H03F2203/45604
摘要： A first and a second transistor (T,, T 2 ) whose emitters are connected to a common point (4) via first resistors (R 1 , R 2 ), which common point is connected to the positive power-supply terminal via a current source (I 1 ), form a differential amplifier to which an input signal (V i ) is applied. In order to increase the slew rate the quiescent current through the first and the second transistor (T 1 , T 2 ) is made to increase when the input voltage (V i ) increases. This is achieved by means of a third transistor (T 3 ) whose emitter is connected to the common point (4). The base of this transistor (T 3 ) is connected to the tapping of a voltage divider which is arranged between the bases of the first and the second transistor (T 1 , T 2 ) and which comprises second resistors (R 3 , R 4 ). When the input voltage increases the transistor (T 3 ) drains a continually decreasing portion of the current from the current source (I 1 ).
摘要翻译：第一和第二晶体管（T，T2）的发射极经由第一电阻器（R1，R2）连接到公共点（4），该公共点经由电流源（I1）连接到正电源端子）形成输入信号（Vi）施加到的差分放大器。为了提高转换速率，当输入电压（Vi）增加时，使通过第一和第二晶体管（T1，T2）的静态电流增加。这是通过其发射极连接到公共点（4）的第三晶体管（T3）实现的。该晶体管（T3）的基极连接到布置在第一和第二晶体管（T1，T2）的基极之间并且包括第二电阻器（R3，R4）的分压器的抽头。当输入电压增加时，晶体管（T3）耗尽来自电流源（I1）的电流的连续下降部分。

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