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    • 5. 发明授权
    • Sense amplifiers and sensing methods
    • 感应放大器和传感方法
    • US5394037A
    • 1995-02-28
    • US42533
    • 1993-04-05
    • Gregg R. JosephsonMark E. Bauer
    • Gregg R. JosephsonMark E. Bauer
    • H03F1/02H03F1/08
    • H03F1/0222
    • A sense amplifier for sensing the impedance between two terminals includes an amplification stage whose input is connected to one of the terminals. The input is connected to a power supply voltage VCC through two transistors in parallel. One transistor provides a high speed by providing a large current when the voltage on the input is low. Moreover, to increase speed and save power, that transistor turns off when the amplification stage input voltage is slightly above the amplification stage trip voltage. The other transistor provides a small current to pull the amplification stage input up almost to VCC to reduce the amplification stage power consumption. The small current does not interfere significantly with the pull-down speed. One of the amplification stage power terminals is connected to ground through current limiting transistors to reduce the amplification stage power consumption when the amplification stage input voltage is at its low value which is slightly below the trip voltage. A reference voltage generator controls one of the two transistors connecting the amplification stage input to VCC so as to prevent the low value of the amplification stage input voltage from converging to the trip voltage over a wide range of the VCC and processing variations.
    • 用于感测两个端子之间的阻抗的读出放大器包括其输入端连接到一个端子的放大级。 输入端通过并联的两个晶体管连接到电源电压VCC。 一个晶体管通过在输入电压较低时提供大电流来提供高速度。 此外,为了提高速度并节省功率,当放大级输入电压略高于放大级跳闸电压时,该晶体管截止。 另一个晶体管提供一个小电流,将放大级输入拉到几乎VCC,以降低放大级功耗。 小电流不会与下拉速度大大干扰。 其中一个放大级电源端子通过限流晶体管连接到地,以在放大级输入电压处于略低于跳闸电压的低值时降低放大级功耗。 参考电压发生器控制将放大级输入连接到VCC的两个晶体管中的一个,以便在VCC和处理变化的宽范围内防止放大级输入电压的低值会聚到跳闸电压。