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    • 5. 发明专利
    • Agc circuit
    • AGC电路
    • JP2009055117A
    • 2009-03-12
    • JP2007217425
    • 2007-08-23
    • Sanyo Electric Co LtdSanyo Semiconductor Co Ltd三洋半導体株式会社三洋電機株式会社
    • AMAMIYA KEIJIINOUE HIDEKAZU
    • H03G3/30
    • H03F3/45475H03F2203/45136H03F2203/45151H03F2203/45154H03F2203/45156H03F2203/45166H03F2203/45244H03F2203/45564H03F2203/45622H03G3/301
    • PROBLEM TO BE SOLVED: To provide an AGC (automatic gain control) circuit which prevents disturbance of an output waveform, when input signal changes rapidly.
      SOLUTION: A first terminal of a capacitor 25 is connected to an output end of a variable gain amplifier 22, and a second terminal of the capacitor 25 is connected to a non-inverting input terminal (+) of a differential amplifier 26. A reference voltage Vref2 is applied to an inverting input terminal (-) of the differential amplifier 26. Bias voltage Vbias from a bias circuit 30 is applied to the non-inverting input terminal (+) of the differential amplifier 26, and the reference voltage Vref2 from the bias circuit 30 is applied to the inverting input terminal (-) of the differential amplifier 26. The output signal of the differential amplifier 26 is applied as a direct-current control voltage to the variable gain amplifier 22 through a direct-current amplifier 39.
      COPYRIGHT: (C)2009,JPO&INPIT
    • 要解决的问题:当输入信号快速变化时,提供一种防止输出波形干扰的AGC(自动增益控制)电路。 解决方案:电容器25的第一端子连接到可变增益放大器22的输出端,并且电容器25的第二端子连接到差分放大器26的非反相输入端子(+) 参考电压Vref2被施加到差分放大器26的反相输入端( - )。来自偏置电路30的偏置电压Vbias被施加到差分放大器26的非反相输入端(+),参考电压 来自偏置电路30的电压Vref2被施加到差分放大器26的反相输入端( - )。差动放大器26的输出信号作为直流控制电压通过直流电压施加到可变增益放大器22。 电流放大器39.版权所有(C)2009,JPO&INPIT
    • 6. 发明专利
    • Electronic circuit
    • 电子电路
    • JPS6110306A
    • 1986-01-17
    • JP13008584
    • 1984-06-26
    • Toshiba Corp
    • SHIMIZU SHIYOUICHIKAMAYA YUKIO
    • H03F3/45
    • H03F3/45381H03F2203/45151H03F2203/45212H03F2203/45596H03F2203/45622H03F2203/45702
    • PURPOSE:To reduce an output offset voltage by giving a difference voltage in advance to a gate voltage of a differential FET causing an offset. CONSTITUTION:The drain of differential FETs Q1, Q2 is connected to a power supply VDD via load resistors RL1, RL2 and the source is connected to a common constant current source I1. The drains of bias FETs Q3, Q4 are connected in common and the sources are connected respectively to other constant current source I0 and gate of the FETs Q1, Q2. Then the gates of FETs Q3, Q4 are biased to the same potential. Since the FETs Q1, Q2 and FETs Q3, Q4 are manufactured back to back similarly in one mask, even when an offset due to mis- aligned mask is caused between the FETs Q1, Q2, the charactetistic of the FETs Q3, Q4 is different similarly and a bias applied to the gate is fluctuated and the offset of the output voltage is reduced.
    • 目的:通过将差分电压提前到导致偏移的差分FET的栅极电压来减小输出偏移电压。 构成:差分FET Q1,Q2的漏极通过负载电阻RL1,RL2连接到电源VDD,源极连接到公共恒流源I1。 偏置FET Q3,Q4的漏极共同连接,源极分别连接到其他恒流源I0和FET Q1,Q2的栅极。 然后FET Q3,Q4的栅极被偏置到相同的电位。 由于FET Q1,Q2和FET3Q,Q4在一个掩模中类似地制造为背靠背,所以即使在FET Q1,Q2之间引起由于错误对准的掩模产生的偏移,FET Q3,Q4的特征也不同 类似地,施加到栅极的偏置波动,并且输出电压的偏移减小。