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    • 1. 发明授权
    • Self-referenced current switch logic circuit with a push-pull output
buffer
    • 具有推挽输出缓冲器的自参考电流开关逻辑电路
    • US5089725A
    • 1992-02-18
    • US604842
    • 1990-10-26
    • Pierre MollierJean-Paul NuezPascal Tannhof
    • Pierre MollierJean-Paul NuezPascal Tannhof
    • H03K19/013H03K19/086
    • H03K19/086H03K19/013
    • The base circuit comprises a self-referenced preamplifier (31) of the differential type connected between first and second supply voltages and a push-pull output buffer stage connected between second and third supply voltages. The push-pull output buffer stage comprises a pull-up transistor and a pull-down transistor connected in series with the circuit output node coupled therebetween. These transistors are driven by complementary and substantially simultaneous signals S and S supplied by the preamplifier. Both branches of the preamplifier are tied at a first output node (M). The first branch comprises a logic block performing the desired logic function of the base circuit that is connected through a load rsistor to the second supply voltage. The logic block consists of three parallel-connected input NPN transistors, whose emitters are coupled together at the first output node for NOR operation. The second branch is comprised of a biasing/coupling block connected to the second supply voltage and coupled to the first output node and to the base (B) node of the pull-down transistor. This block ensures both the appropriate polarization of the nodes in DC without the need of external reference voltage generators and a low impedance path for fast signal transmission of the output signal from node M to node B in AC, when input transistors of the logic block are ON. and base nodes. An anti-saturation block (AB), consisting typically of a Schottky Barrier Diode (SBD), is useful to prevent saturation of the pull down transistor (TDN) to further speed up the circuit.
    • 基本电路包括连接在第一和第二电源电压之间的差分类型的自参考前置放大器(31)和连接在第二和第三电源电压之间的推挽输出缓冲级。 推挽输出缓冲级包括与耦合在其间的电路输出节点串联连接的上拉晶体管和下拉晶体管。 这些晶体管由前置放大器提供的互补和基本同时的信号S和& upbar&S驱动。 前置放大器的两个分支都连接在第一个输出节点(M)上。 第一分支包括执行通过负载晶体管连接到第二电源电压的基本电路的期望逻辑功能的逻辑块。 逻辑块由三个并联的输入NPN晶体管组成,其发射极在第一个输出节点耦合在一起用于NOR运算。 第二分支包括连接到第二电源电压并耦合到第一输出节点和下拉晶体管的基极(B)节点的偏置/耦合模块。 该块在逻辑块的输入晶体管中确保DC中节点的适当极化,而不需要外部参考电压发生器和低阻抗路径,用于在AC中将节点M到节点B的输出信号快速信号传输 上。 和基本节点。 通常由肖特基势垒二极管(SBD)组成的抗饱和块(AB)可用于防止下拉晶体管(TDN)的饱和,从而进一步加速电路。
    • 4. 发明授权
    • GaAs MESFET logic circuits including push pull output buffers
    • GaAs MESFET逻辑电路包括推挽输出缓冲器
    • US4922135A
    • 1990-05-01
    • US271124
    • 1988-11-14
    • Pierre MollierPascal Tannhof
    • Pierre MollierPascal Tannhof
    • H01L27/095H03K5/02H03K19/017H03K19/0185H03K19/094H03K19/0952
    • H03K19/09436H03K19/01721
    • The present invention relates to a family of new GaAs MESFET logic circuits including push pull output buffers, which exhibits very strong output driving capability and very low power consumption at fast switching speeds. A 3 way OR/NOR circuit of this invention includes a standard differential amplifier, the first branch of which is controlled by logic input signals. The second branch includes a current switch controlled by a reference voltage. The differential amplifier provides first and second output signals simultaneously and complementary each other. The circuit further includes two push pull output buffers. The first output buffer comprises an active pull up device connected in series with an active pull down device, and the first circuit output signal is available at their common node or at the output terminal. The active pull up device is controlled by a first output signal of the differential amplifier, and the active pull down device is preferably controlled by the second output signal through an intermediate source follower buffer. The second output buffer is of similar structure. The depicted circuit is of the dual phase type. However, if only one phase of the circuit output signal is needed, the output buffer and the intermediate buffer can be eliminated. The number of devices can be even further reduced by eliminating the other remaining intermediate buffer.