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    • 1. 发明授权
    • Gamma correcting circuit
    • 伽马校正电路
    • US5610666A
    • 1997-03-11
    • US575147
    • 1995-12-19
    • Goro UedaHiroshi Shiba
    • Goro UedaHiroshi Shiba
    • H04N5/202
    • H04N5/202
    • A gamma correcting circuit has a plurality of differential amplifiers having respective input terminals for being supplied with a video signal and respective output terminals connected in common. At least one of the differential amplifiers comprises differential pairs of transistors including transistors whose bases are not connected to the input terminal, emitters are connected to respective resistors, and collectors are connected in common. A plurality of individually energizable and de-energizable external reference voltage supplies are connected to the bases of the transistors whose bases are not connected to the input terminal.
    • 伽马校正电路具有多个差分放大器,其具有用于提供视频信号的各个输入端子和共同连接的各个输出端子。 差分放大器中的至少一个包括差分对晶体管,其晶体管包括其基极未连接到输入端的晶体管,发射极连接到相应的电阻器,并且集电极共同连接。 多个可单独激励和断电的外部参考电压源连接到其基极未连接到输入端子的晶体管的基极。
    • 5. 发明授权
    • Sample-and-hold circuit
    • 采样保持电路
    • US5467035A
    • 1995-11-14
    • US315716
    • 1994-09-30
    • Susumu OhiHiroshi Shiba
    • Susumu OhiHiroshi Shiba
    • G11C27/02H03K17/66H03K5/00
    • H03K17/667G11C27/026
    • An input terminal is connected to bases of first and second transistors. Collectors of the first and fourth transistors are connected to a power-source terminal. Collectors of the second and third transistors are grounded. A base of the third transistor is connected to an emitter of the first transistor. A base of the fourth transistor is connected to an emitter of the second transistor. One terminal of the capacitor is grounded and the other terminal thereof is connected to emitters of the third and fourth transistors and an input of an output buffer whose output is connected to an output terminal. A collector of a fifth transistor is connected to the power-source terminal and a base thereof is connected to the output terminal. A collector of a sixth transistor is grounded and a base thereof is connected to the output terminal. A first constant-current source is connected to an emitter of the fifth transistor and a base of the fourth transistor. A second constant-current source is connected to an emitter of the sixth transistor and the base of the third transistor. A third constant-current source is connected to the emitter of the first transistor and turned on at a sampling time. A fourth constant-current source is connected to the emitter of the second transistor and turned on at the sampling time.
    • 输入端子连接到第一和第二晶体管的基极。 第一和第四晶体管的集电极连接到电源端子。 第二和第三晶体管的集电极接地。 第三晶体管的基极连接到第一晶体管的发射极。 第四晶体管的基极连接到第二晶体管的发射极。 电容器的一个端子接地,另一个端子连接到第三和第四晶体管的发射极,输出端连接到输出端子的输出缓冲器的输入端。 第五晶体管的集电极连接到电源端子,其基极连接到输出端子。 第六晶体管的集电极接地,其基极连接到输出端子。 第一恒流源连接到第五晶体管的发射极和第四晶体管的基极。 第二恒流源连接到第六晶体管的发射极和第三晶体管的基极。 第三恒流源连接到第一晶体管的发射极,并在采样时间导通。 第四恒流源连接到第二晶体管的发射极,并在采样时间导通。