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    • 65. 发明授权
    • Folded-cascode configured differential current steering column decoder
circuit
    • 折叠共源共栅配置差动电流转向柱解码电路
    • US4796230A
    • 1989-01-03
    • US65930
    • 1987-06-24
    • Ian A. Young
    • Ian A. Young
    • G11C11/417G11C7/00G11C7/10
    • G11C7/00G11C7/1006
    • A folded cascode configured current steering decoder circuit for coupling a column of memory cells of a static random access memory for reading by a sense amplifier. A pair of cascode configured p-channel transistors turn on to couple memory bit lines to output lines so that the sense amplifier can provide the reading of contents of the selected memory cell. A second pair of p-channel transistors are each coupled to each of the bit lines for providing a steady state current source when the first pair of transistors are turned on for transferring information from the bit line to the output line pairs. The cascode configured transistors are MOSFET switches which are biased to cause a current inbalance when data from the memory cell are placed on the bit lines. The inbalanced current passing through the cascoded transistor pairs causes a current difference which can then sensed by a low input impedence sense amplifier. The cascoded MOSFETS provide for an isolation of the bit line capacitance from the output line capacitance to reduce the amount of time required for transferring information from the bit line to the sense amplifier.
    • 折叠共源共栅配置的当前导向解码器电路,用于耦合静态随机存取存储器的存储单元列,以供读出放大器读取。 一对共源共栅配置的p沟道晶体管导通以将存储器位线耦合到输出线,使得读出放大器可以提供对所选存储单元的内容的读取。 当第一对晶体管导通以将信息从位线传输到输出线对时,第二对p沟道晶体管分别耦合到每个位线以提供稳态电流源。 串联配置的晶体管是MOSFET开关,当来自存储器单元的数据被放置在位线上时,MOSFET开关被偏置以导致电流不平衡。 通过级联三极管对的不平衡电流导致电流差,然后可以由低输入阻抗读出放大器感测。 级联MOSFETs提供了与输出线电容隔离的位线电容,以减少将信息从位线传输到读出放大器所需的时间。