公开(公告)号：US06914479B1

公开(公告)日：2005-07-05

申请号：US10604479

申请日：2003-07-24

申请人： Bertrand Gabillard ,  Michel Rivier ,  Fabrice Voisin ,  Philippe Girard

发明人： Bertrand Gabillard ,  Michel Rivier ,  Fabrice Voisin ,  Philippe Girard

IPC分类号： H03F3/45

CPC分类号： H03F3/45475 ,  H03F3/45278 ,  H03F3/45973 ,  H03F2203/45521 ,  H03F2203/45652

摘要： There is disclosed an improved differential amplifier (20) having a feedback loop that generates an amplified output signal (Vout) from an input signal (Vin) supplied by a preceding stage. It comprises an input matching circuit (11) connected to said preceding stage, a buffer (22) and an amplification section (12) connected in series in the direct amplification line, a first amplifier (16), a RC network (17′) and a second amplifier (23) connected in series in a parallel loop between the outputs and the inputs of the amplification section that generate the feedback signal. The role of said buffer and second amplifier associated in a dedicated direct and feedback signal combining block (21) is to respectively isolate the input signal and the feedback signal from the summing nodes (A′,B′) at the amplification section inputs. As a result, the summation of the input signal and the feedback signal is improved, the DC component of the output signal is filtered out in order to significantly reduce the DC offset. In addition, the input impedance matching represented by parameter S11 is considerably improved.

摘要翻译： 公开了一种具有反馈回路的改进的差分放大器（20），该反馈回路从由前一级提供的输入信号（Vin）产生放大的输出信号（Vout）。 它包括连接到所述前级的输入匹配电路（11），串联连接在直接放大线路中的缓冲器（22）和放大部分（12），第一放大器（16），RC网络（17'） 以及在产生反馈信号的输出与放大部分的输入之间并联连接的第二放大器（23）。 在专用直接和反馈信号组合块（21）中相关联的所述缓冲器和第二放大器的作用是在放大部分输入端分别隔离来自求和节点（A'，B'）的输入信号和反馈信号。 结果，改善了输入信号和反馈信号的总和，输出信号的直流分量被滤除，以便显着减小直流偏移。 此外，由参数S 11表示的输入阻抗匹配得到显着改善。

公开(公告)号：US06861908B2

公开(公告)日：2005-03-01

申请号：US10604478

申请日：2003-07-24

申请人： Bertrand Gabillard ,  Michel Rivier ,  Fabrice Voisin ,  Philippe Girard

发明人： Bertrand Gabillard ,  Michel Rivier ,  Fabrice Voisin ,  Philippe Girard

IPC分类号： H03F3/343 ,  H03F3/68

CPC分类号： H03F3/3432

摘要： There is disclosed an improved 2-stage large bandwidth amplifier (20) comprised of two stages formed by first and second bipolar transistors (Q1,Q2) configured in common emitter that are connected in series with their emitters connected to a first supply voltage (Gnd). The input signal (Vin) is applied to the base of said first transistor via an input terminal (11), while the output signal (Vout) is available at an output terminal (12) connected to the collector of said second transistor. A parallel feedback structure (13′) is provided. It consists, in a first branch, of two diodes (D1,D2) in series connected between a second supply voltage (Vcc) and the collector of the second bipolar transistor, and in another branch of a third bipolar transistor (Q3) configured in emitter follower with a resistor (Rf) in the emitter. The base and the collector of said third bipolar transistor are respectively connected to the common node of said diodes and to said second supply voltage. The resistor is connected to the common node of said first and second transistors to inject the feedback signal (Vf). Because, the two bodies have a low internal resistance and reduce the collector capacitance of the second transistor, the overall bandwidth of the improved amplifier is significantly extended in the very high frequencies (e.g. 20 GHz and above).

摘要翻译： 公开了一种改进的2级大带宽放大器（20），包括由配置在共发射极中的第一和第二双极晶体管（Q1，Q2）形成的两级，它们与连接到第一电源电压（Gnd ）。 输入信号（Vin）经由输入端子（11）施加到所述第一晶体管的基极，而输出信号（Vout）在连接到所述第二晶体管的集电极的输出端子（12）处可用。 提供并行反馈结构（13'）。 它包括在第一分支中串联连接在第二电源电压（Vcc）和第二双极晶体管的集电极之间的两个二极管（D1，D2），以及在第三分支中配置的第三双极晶体管 射极跟随器在发射极中具有电阻（Rf）。 所述第三双极晶体管的基极和集电极分别连接到所述二极管的公共节点和所述第二电源电压。 电阻器连接到所述第一和第二晶体管的公共节点以注入反馈信号（Vf）。 因为这两个机体具有较低的内部电阻并且降低了第二晶体管的集电极电容，所以改进的放大器的总带宽在非常高的频率（例如20GHz及以上）中被显着地扩展。