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    • 27. 发明专利
    • Audio signal amplifier circuit, inverting amplifier, and electronic apparatus using the same
    • 音频信号放大器电路,反相放大器和使用它的电子设备
    • JP2011139415A
    • 2011-07-14
    • JP2010078285
    • 2010-03-30
    • Rohm Co Ltdローム株式会社
    • ONO KATSUYUKIKAWAMURA AKINOBU
    • H03F1/00H03F3/183H04R3/00
    • H03F3/45475H03F1/0261H03F3/45183H03F2200/03H03F2203/45528H03F2203/45536H03F2203/45544H03F2203/45548H03F2203/45561H03F2203/45594H03F2203/45596H03F2203/45618H03F2203/45622
    • PROBLEM TO BE SOLVED: To provide an audio signal amplifier circuit suppressing noise.
      SOLUTION: An inverting amplifier 10 for driving a headphone 6 through an output capacitor C2 includes: an operation amplifier 14; an input resistance Ri having a first terminal for receiving an audio signal VI to be amplified and a second terminal connected to an inverting input terminal (-) of the operation amplifier 14; and a feedback resistance Rfb having a first terminal connected to an inverting input terminal (+) of the operation amplifier 14 and a second terminal connected to an output terminal of the operation amplifier 14. A reference voltage source 20 generates a bias voltage Vb and supplies it to a non-inverting input terminal (+) of the operation amplifier 14. A discharge path 12 includes a discharge resistance Rdis and a first switch SW1 disposed in series between an output terminal of the reference voltage source 20 and a fixed voltage terminal. A second switch SW2 is disposed between the output terminal of the operation amplifier 14 and a node on the discharge path 12 with a potential higher than the discharge resistance Rdis.
      COPYRIGHT: (C)2011,JPO&INPIT
    • 要解决的问题:提供抑制噪声的音频信号放大器电路。 解决方案:用于通过输出电容器C2驱动耳机6的反相放大器10包括:运算放大器14; 输入电阻Ri具有用于接收待放大的音频信号VI的第一端子和连接到运算放大器14的反相输入端( - )的第二端子; 以及反馈电阻Rfb,其具有连接到运算放大器14的反相输入端(+)的第一端子和连接到运算放大器14的输出端的第二端子。参考电压源20产生偏置电压Vb并提供 它连接到运算放大器14的非反相输入端(+)。放电通路12包括串联设置在参考电压源20的输出端和固定电压端之间的放电电阻Rdis和第一开关SW1。 第二开关SW2设置在运算放大器14的输出端子和放电路径12上的节点之间,具有高于放电电阻Rdis的电位。 版权所有(C)2011,JPO&INPIT
    • 28. 发明专利
    • Electronic circuit
    • 电子电路
    • JP2009017265A
    • 2009-01-22
    • JP2007177176
    • 2007-07-05
    • Eudyna Devices Incユーディナデバイス株式会社
    • HARA HIROSHISAWADA SOSAKU
    • H03F3/08
    • H03F3/45475H03F1/08H03F3/087H03F2203/45138H03F2203/45618
    • PROBLEM TO BE SOLVED: To quickly stabilize a reference signal, while stabilizing the reference signal even when a high-level input signal or a low-level input signal is continuously inputted.
      SOLUTION: An electronic circuit is provided with a differential amplifier circuit 14, to which a digital input signal VA and a reference signal Vref are inputted, a first smoothing circuit 21 for smoothing the digital input signal VA by using a first capacity value, a second smoothing circuit 22 for smoothing the digital input signal VA by using a second capacity value larger than the first capacity value, and a first switch S1 that selects output of either of the first smoothing circuit 21 and the second smoothing circuit 22 that sets it as the reference signal Vref.
      COPYRIGHT: (C)2009,JPO&INPIT
    • 要解决的问题:即使当连续输入高电平输入信号或低电平输入信号时,也可以在稳定参考信号的同时快速稳定参考信号。 解决方案:电子电路设置有输入数字输入信号VA和参考信号Vref的差分放大器电路14,用于通过使用第一容量值来平滑数字输入信号VA的第一平滑电路21 ,第二平滑电路22,用于通过使用大于第一容量值的第二容量值对数字输入信号VA进行平滑;以及第一开关S1,其选择设置第一平滑电路21和第二平滑电路22中的任一个的输出 它作为参考信号Vref。 版权所有(C)2009,JPO&INPIT