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    • 6. 发明授权
    • Bi-directional voltage translator
    • 双向电压转换器
    • US6154057A
    • 2000-11-28
    • US340232
    • 1999-07-01
    • Shuyong ShaoHung VuongCharles BrowderChristine Purcell
    • Shuyong ShaoHung VuongCharles BrowderChristine Purcell
    • H03K19/018H03K19/0175
    • H03K19/01843
    • A bi-directional voltage translator (125) has a first port (201) that communicates a signal at a first voltage level, and second port (202) that communicates a signal at a second voltage level different from the first voltage level. A switching circuit, including a bipolar junction transistor (210) and a switch (220), couples both ports (201, 202). The transistor (210) has a collector (211) coupled, via a pull-up circuit (206), to a voltage source corresponding to the first voltage level, and to the first port (201), and an emitter (212) coupled to the second port. The base (213) of the transistor (210) is coupled, via a pull-up circuit (207), to a voltage source corresponding to the second voltage level. Preferably, the switch (220) is Schottky diode or other diode having a forward voltage drop.
    • 双向电压转换器(125)具有以第一电压电平传送信号的第一端口(201)和以不同于第一电压电平的第二电压电平传送信号的第二端口(202)。 包括双极结型晶体管(210)和开关(220)的开关电路耦合两个端口(201,202)。 晶体管(210)具有经由上拉电路(206)耦合到对应于第一电压电平的电压源和耦合到第一端口(201)的集电极(211),并且发射极(212)耦合 到第二个港口 晶体管(210)的基极(213)经由上拉电路(207)耦合到对应于第二电压电平的电压源。 优选地,开关(220)是具有正向压降的肖特基二极管或其它二极管。
    • 7. 发明授权
    • Bi-directional signal transmission system
    • 双向信号传输系统
    • US07417464B2
    • 2008-08-26
    • US11856009
    • 2007-09-14
    • John Crawford
    • John Crawford
    • H03K19/0175
    • H03K19/01843H03K19/0826
    • A bi-directional signal transmission system including, a first bi-directional signal path having circuitry adapted to generate a logic high level on said first path, one or more first stations connected to the first bi-directional signal path adapted to monitor a logic level on said first path, and to generate a logic low level on said first path, an interface device operatively coupled to the first bi-directional signal path, said interface device having a first receive input also capable of functioning as an output capable of pulling the first path low; and a second bi-directional signal path coupled to a transmit output and a receive input on the buffered side of the interface device, said interface device includes a first means for generating on the first bi-directional signal path a medium logic level in response to a low level on the receive input on the buffered side, and a second means for generating on the transmit output on the buffered side, a low logic level in response to a low level on the first bi-directional signal path, otherwise generating a high level on the said transmit output, wherein the one or more first stations are adapted to detect the medium and the low levels on the first bi-directional signal path as LOW, and the high logic level on the first bi-directional signal path as HIGH, and wherein further the first means for generating the medium logic level on the first signal path includes an open collector transistor, the emitter of which is connected to VEE, with its collector pulling the first signal path low through a diode connected transistor.
    • 一种双向信号传输系统,包括具有适于在所述第一路径上产生逻辑高电平的电路的第一双向信号路径,连接到所述第一双向信号路径的一个或多个第一站适于监视逻辑电平 在所述第一路径上,并且在所述第一路径上生成逻辑低电平,可操作地耦合到所述第一双向信号路径的接口设备,所述接口设备具有第一接收输入,其还能够用作能够拉动 第一路低; 以及耦合到所述接口设备的缓冲侧上的发射输出和接收输入的第二双向信号路径,所述接口设备包括第一装置,用于在第一双向信号路径上响应于 在缓冲侧的接收输入上的低电平,以及用于在缓冲侧的发送输出上产生响应于第一双向信号路径上的低电平的低逻辑电平的第二装置,否则产生高电平 其中所述一个或多个第一站适合于将第一双向信号路径上的介质和低电平检测为低电平,并且第一双向信号路径上的高逻辑电平为HIGH ,并且其中所述用于在所述第一信号路径上产生所述介质逻辑电平的所述第一装置包括开路集电极晶体管,其发射极连接到VEE,其集电极将所述第一信号路径拉低 通过二极管连接晶体管。