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    • 38. 再颁专利
    • Linear differential amplifier
    • 线性差分放大器
    • USRE36861E
    • 2000-09-12
    • US264034
    • 1999-03-08
    • Mikio KoyamaHiroshi Tanimoto
    • Mikio KoyamaHiroshi Tanimoto
    • H03F3/45
    • A differential amplifier with improved linearity. The amplifier includes a circuit comprised of two emitter-coupled pairs, each pair being formed by two transistors, with connections between corresponding collectors, and constant voltage sources for producing offsets between corresponding bases of the emitter-coupled pairs. The improved linearity is achieved by obtaining outputs as sums of collector currents with offsets. The emitter areas of the transmitters can be of the minimum size available. This feature, when combined with the use of emitter-followers as the constant voltage sources, enable the differential amplifier to achieve a high S/N ratio, a good high-frequency characteristic, a high direct current gain, and a high-speed operation capability along with the improved linearity. In addition, the linearity is further improved by using additional diodes connected to the transistors.
    • 具有提高线性度的差分放大器。 放大器包括由两个发射极耦合对组成的电路,每对由两个晶体管形成,其中相应的集电极之间具有连接,以及用于产生发射极耦合对的相应基极之间的偏移的恒定电压源。 通过获得输出作为具有偏移的集电极电流的总和来实现改进的线性度。 变送器的发射极面积可以是可用的最小尺寸。 该特征与使用发射极跟随器作为恒定电压源组合使能使差分放大器实现高S / N比,良好的高频特性,高直流增益和高速运算 能力以及改善的线性度。 此外,通过使用连接到晶体管的附加二极管来进一步提高线性度。
    • 39. 发明授权
    • Low distortion differential amplifier circuit
    • 低失真差分放大电路
    • US5774019A
    • 1998-06-30
    • US636484
    • 1996-04-23
    • Mikio KoyamaHiroyuki Kimura
    • Mikio KoyamaHiroyuki Kimura
    • H03F3/45H03F1/32
    • H03F1/3211
    • The invention is a low distortion differential amplifier circuit with the following characteristics: there are outputs OUT1, OUT2, inputs IN1, IN2; a ground GND that is connected to each of the current sources 14, 16; each transistor 10, 12 is connected in series to each of the above outputs OUT1, OUT2 and to each of the current sources 14, 16; each of the above transistors' 10, 12 base (or gate) is connected to the output of an operational amplifier 18, 20; each of the above transistors' 10, 12 emitter (or source) is connected by the resistor 22; the positive input of each of the above operational amplifiers 18, 20 is connected to one of the above inputs IN1, IN2; the terminal of each of the above transistors 10, 12 that is connected to the resistor is also connected to a voltage source 30, 32 which is then connected to the negative input of the above operational amplifier 18, 20. Transistors with special bases (or gates) are used in the input stage of the operational amplifiers mentioned above.
    • 本发明是具有以下特性的低失真差分放大器电路:具有输出OUT1,OUT2,输入IN1,IN2; 连接到每个电流源14,16的地GND; 每个晶体管10,12串联连接到上述每个输出OUT1,OUT2和每个电流源14,16; 上述晶体管10,12基极(或栅极)中的每一个连接到运算放大器18,20的输出; 上述晶体管10,12发射极(或源极)中的每一个由电阻器22连接; 上述运算放大器18,20的正输入端连接到上述输入端IN1,IN2中的一个; 连接到电阻器的上述晶体管10,12中的每一个的端子也连接到电压源30,32,然后电压源30,32连接到上述运算放大器18,20的负输入端。具有特殊基极(或 门)用于上述运算放大器的输入级。