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    • 4. 发明授权
    • Inverting logic buffer BICMOS switching circuit using an enabling switch
for three-state operation with reduced dissipation
    • 反相逻辑缓冲器BICMOS开关电路使用启用开关进行三态操作,减少耗散
    • US4678943A
    • 1987-07-07
    • US704209
    • 1985-02-22
    • Akira UragamiYukio SuzukiShinji KadonoMasahiro IwamuraIkuro MasudaTatsumi Yamauchi
    • Akira UragamiYukio SuzukiShinji KadonoMasahiro IwamuraIkuro MasudaTatsumi Yamauchi
    • H03K19/0175H03K17/04H03K17/60H03K19/0944
    • H03K19/09448
    • A switching circuit comprises a pre-stage circuit coupled to receive an input signal and an output stage, wherein an output signal having a phase opposite to that of a signal of an input terminal IN can be obtained from an output terminal OUT of the output stage. The pre-stage circuit includes a p-channel MOSFET M1 and an n-channel MOSFET M2 that receive input signals at their gates. The output stage includes two NPN transistors Q1 and Q2 that are connected in series. The drain output of the p-channel MOSFET M1 is applied to the base of one of the transistors of the output stage, and the source output of the n-channel MOSFET M2 is applied to the base of the other of the transistors of the output stage. A third MOSFET M3 is coupled between a power supply and the p-channel MOSFET M1 and the n-channel MOSFET M2. When the MOSFET M3 is rendered non-conductive by a control signal EN, both MOSFETs M1 and M2 and both NPN transistors Q1 and Q2 become non-conductive irrespective of the signal of the input terminal IN. Under this condition, the output terminal OUT is in a floating state. Thus, the switching circuit is a tri-state circuit.
    • 开关电路包括耦合以接收输入信号的预级电路和输出级,其中可以从输出级的输出端OUT获得具有与输入端IN的信号相反的相位的输出信号 。 该前级电路包括在其栅极接收输入信号的p沟道MOSFET M1和n沟道MOSFET M2。 输出级包括串联连接的两个NPN晶体管Q1和Q2。 p沟道MOSFET M1的漏极输出被施加到输出级的一个晶体管的基极,并且n沟道MOSFET M2的源极输出被施加到输出的晶体管的另一个的基极 阶段。 第三个MOSFET M3耦合在电源和p沟道MOSFET M1和n沟道MOSFET M2之间。 当通过控制信号EN使MOSFET M3不导通时,无论输入端子IN的信号如何,MOSFET M1和M2以及两个NPN晶体管Q1和Q2都不导通。 在这种情况下,输出端子OUT处于浮置状态。 因此,开关电路是三态电路。