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    • 6. 发明专利
    • Differential amplifier circuit and charge controller using the differential amplifier circuit
    • 使用差分放大器电路的差分放大器电路和充电控制器
    • JP2008067188A
    • 2008-03-21
    • JP2006244430
    • 2006-09-08
    • Ricoh Co Ltd株式会社リコー
    • NODA IPPEI
    • H03F1/30H03F3/45
    • H03F3/45183H03F3/45771H03F3/70H03F2203/45048H03F2203/45101H03F2203/45244H03F2203/45354H03F2203/45372H03F2203/45391H03F2203/45392H03F2203/45482H03F2203/45686
    • PROBLEM TO BE SOLVED: To obtain a differential amplifier circuit having an offset adjustment circuit which is not affected by temperature change and secular change without affecting resolution of offset voltage by variation in manufacture, and to provide a charge controller using the differential amplifier circuit.
      SOLUTION: The differential amplifier is constituted so that voltage drop in the adjustment resistor always becomes constant, offset compensation voltage Vadj closest to measured offset voltage Vof is set since a bias current source 2 fluctuates bias current i3 so as to compensate fluctuation in resistance values even when the resistance values of resistors R1-R4 constituting an adjustment resistor fluctuate by the manufacturing variation, furthermore, fluctuation of the offset compensation voltage Vadj is suppressed since a resistor Rb for generating the bias current similarly changes even when the adjustment resistor changes according to temperature variation during an operation and a resistance value of the adjustment resistor changes by aging in the differential amplifier circuit 1.
      COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题:为了获得具有不受温度变化和长期变化影响的偏移调整电路的差分放大器电路,而不会通过制造变化而影响偏移电压的分辨率,并且提供使用差分放大器的充电控制器 电路。 解决方案:差分放大器构成为使得调节电阻器中的电压降总是恒定的,因为偏置电流源2使偏置电流i3波动,所以偏移补偿电压Vadj被设置为最接近测量的偏移电压Vof,以补偿波动 即使当构成调节电阻器的电阻器R1-R4的电阻值由于制造变化而波动时,电阻值也被抑制,此外,由于用于产生偏置电流的电阻器Rb即使当调节电阻器变化时也类似地改变,所以抑制了偏移补偿电压Vadj的波动 根据操作期间的温度变化,并且调节电阻器的电阻值由差分放大器电路1中的老化而改变。版权所有(C)2008,JPO&INPIT
    • 7. 发明专利
    • Single stage balanced voltage amplifier
    • 单级平衡电压放大器
    • JP2007336534A
    • 2007-12-27
    • JP2007143426
    • 2007-05-30
    • Chi Ming John Lamラム・チ・ミン・ジョンLAM Chi Ming John
    • LAM CHI MING JOHN
    • H03F1/24H03F3/45
    • H03F3/52H03F3/45H03F2203/45291H03F2203/45318H03F2203/45338H03F2203/45372H03F2203/45631
    • PROBLEM TO BE SOLVED: To provide a single stage balanced voltage amplifier to achieve a high signal gain while holding an output impedance low.
      SOLUTION: The balanced voltage amplifier includes a single stage having three pairs of vacuum tube triodes for amplifying two input signals (+ Input and - Input), and generating two output signals (+ Output and - Output). The balanced voltage amplifier provides a high voltage gain, wide bandwidth and low output impedance. A local feedback may be provided between the outputs and a second pair of the vacuum tube triodes. An overall feedback may be provided between the outputs and a first pair of the vacuum tube triodes. With the use of the local or overall feedback, further broadening the bandwidth and lowering the output impedance improve the overall balancing.
      COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题:提供单级平衡电压放大器,以在保持输出阻抗低的同时实现高信号增益。

      解决方案:平衡电压放大器包括一个单级,具有三对用于放大两个输入信号(+输入和 - 输入)的真空管三极管,并产生两个输出信号(+输出和 - 输出)。 平衡电压放大器提供高电压增益,宽带宽和低输出阻抗。 可以在输出端和第二对真空管三极管之间提供局部反馈。 可以在输出和第一对真空管三极管之间提供总体反馈。 通过使用本地或整体反馈,进一步拓宽带宽和降低输出阻抗,提高整体平衡。 版权所有(C)2008,JPO&INPIT