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    • 6. 发明授权
    • High input resistance circuit with base current compensation and method
of compensating base current
    • 具有基极电流补偿的高输入电阻电路和补偿基极电流的方法
    • US5654666A
    • 1997-08-05
    • US509672
    • 1995-07-31
    • Naoki TagaKenji Seki
    • Naoki TagaKenji Seki
    • H03F3/45H03F1/56H03F3/34H03F1/34
    • H03F1/56
    • A high input resistance circuit that produces an output signal with a voltage gain of unity includes an input section, a feedback section, a high input resistance amplification section, and an output section. In the input section, transistors 1.sub.a and 1.sub.b form a differential amplification circuit using transistors 2.sub.a and 2.sub.b as emitter resistors, respectively. A feedback circuit is formed by transistors 3.sub.a and 3.sub.b whose collectors are connected to bases of transistors 1.sub.a, 1.sub.b, respectively, and whose emitters are connected to the collector of transistor 8.sub.b of the output section. The bases of transistors 3.sub.a and 3.sub.b are provided a bias from a bias terminal 106 so as to suppress a collector current. In the high input resistance amplification section, transistors 4.sub.a and 4.sub.b form an emitter follower circuit using transistors 5.sub.a, 5.sub.b and resistors R.sub.1, R.sub.2 as emitter resistors, respectively. In the output section, transistors 6.sub.a and 6.sub.b form a differential amplification circuit, wherein the collectors of transistors 6.sub.a and 6.sub.b are connected to a current mirror circuit having transistors 8.sub.a and 8.sub.b, and the emitters of transistors 6.sub.a and 6.sub.b are connected to an emitter load resistor consisting of transistors 7.sub.a, 7.sub.b and resistors R.sub.4, R.sub.5.
    • 产生电压增益为一的输出信号的高输入电阻电路包括输入部分,反馈部分,高输入电阻放大部分和输出部分。 在输入部分中,晶体管1a和1b分别形成使用晶体管2a和2b作为发射极电阻的差动放大电路。 反馈电路由晶体管3a和3b分别形成,其集电极分别连接到晶体管1a,1b的基极,其发射极连接到输出部分的晶体管8b的集电极。 晶体管3a和3b的基极由偏置端子106提供偏压,以抑制集电极电流。 在高输入电阻放大部分中,晶体管4a和4b分别使用晶体管5a,5b和电阻器R1,R2作为发射极电阻来形成射极跟随器电路。 在输出部分中,晶体管6a和6b形成差分放大电路,其中晶体管6a和6b的集电极连接到具有晶体管8a和8b的电流镜电路,并且晶体管6a和6b的发射极连接到发射极负载 电阻器由晶体管7a,7b和电阻器R4,R5组成。