Bidirectional voltage translator
    1.
    发明授权
    Bidirectional voltage translator 失效
    双向电压转换器

    公开(公告)号:US5877633A

    公开(公告)日:1999-03-02

    申请号:US839732

    申请日:1997-04-15

    摘要: A bidirectional voltage translator (102) includes a first port (200/400), a second port (202/402) and a bidirectional translator circuit (208-215/404-408, 410, 412-415) coupled between the first and second ports (200/400,202/402). The first and second ports (200/400,202/402) communicate signals at a first voltage level and a second voltage level, respectively. The second voltage level is different from the first voltage level. When a first port signal input at the first voltage level at the first port (200/400) is detected, the bidirectional translator circuit (208-215/404-408, 410, 412-415) translates the first port signal into the second voltage level at the second port (202/402) and disables translation of a signal at the second port (202/402) to the first port (200/400). When a second port signal input at the second voltage level at the second port (202/402) is detected, the bidirectional translator circuit (208-215/404-408, 410, 412-415) translates the second port signal into the first voltage level at the first port (200/400) and disables translation of a signal at the first port (200/400) to the second port (202/402).

    摘要翻译: 双向电压转换器(102)包括第一端口(200/400),第二端口(202/402)和双向转换器电路(208-215 / 404-408,410,412-415),其耦合在第一端口 第二个港口(200 / 400,202 / 402)。 第一和第二端口(200 / 400,202 / 402)分别以第一电压电平和第二电压电平传送信号。 第二电压电平与第一电压电平不同。 当检测到在第一端口(200/400)处以第一电压电平输入的第一端口信号时,双向转换器电路(208-215 / 404-408,410,412-415)将第一端口信号转换为第二端口信号 第二端口(202/402)处的电压电平,并禁止在第二端口(202/402)处的信号到第一端口(200/400)的转换。 当检测到在第二端口(202/402)处以第二电压电平输入的第二端口信号时,双向转换器电路(208-215 / 404-408,410,412-415)将第二端口信号转换为第一端口 第一端口(200/400)处的电压电平,并禁用在第一端口(200/400)处的信号到第二端口(202/402)的转换。

    Apparatus and method for securing electronic information in a wireless
communication device
    2.
    发明授权
    Apparatus and method for securing electronic information in a wireless communication device 失效
    一种用于在无线通信设备中确保电子信息的装置和方法

    公开(公告)号:US5954817A

    公开(公告)日:1999-09-21

    申请号:US775656

    申请日:1996-12-31

    摘要: An apparatus (200) for securing electronic information (205) includes a microcontroller (202) and an external memory (204) coupled thereto. The microcontroller (202) comprises a one-time programmable security flag (230) that is programmed when the electronic information (205) is stored in the memory (204). Once programmed, the security flag prevents reprogramming of the memory (204). Additionally, the microcontroller (202) comprises an algorithm (400) that generates electronic authentication information (207) from the electronic information (205). The authentication information (207) is stored in the memory (204) along with the electronic information (205). Upon retrieval from the memory (204) for registration, the electronic information (205) is authenticated by generating new electronic authentication information (508) via the algorithm (400) to compare to the authentication information (207) stored in the memory (204). Such authentication prevents swapping out of the memory (204) to gain system access.

    摘要翻译: 一种用于保护电子信息(205)的装置(200)包括微控制器(202)和耦合到其上的外部存储器(204)。 微控制器(202)包括当电子信息(205)存储在存储器(204)中时被编程的一次可编程安全标志(230)。 一旦被编程,安全标志就防止重新编程存储器(204)。 另外,微控制器(202)包括从电子信息(205)生成电子认证信息(207)的算法(400)。 认证信息(207)与电子信息(205)一起存储在存储器(204)中。 当从用于注册的存储器(204)检索时,电子信息(205)通过经由算法(400)生成新的电子认证信息(508)进行认证,以与存储在存储器(204)中的认证信息(207)进行比较, 。 这种认证防止从存储器(204)中的交换以获得系统访问。

    Power control method and apparatus suitable for use in a radio communication device
    3.
    发明授权
    Power control method and apparatus suitable for use in a radio communication device 失效
    适用于无线通信装置的电力控制方法和装置

    公开(公告)号:US06571091B1

    公开(公告)日:2003-05-27

    申请号:US08453217

    申请日:1995-05-30

    IPC分类号: H04B116

    摘要: A portable radio communication device (303) includes power control circuitry (315) for monitoring the voltage level incoming from a battery (317), and provides power to the rest of the radio communication device (303). The power control circuitry (315) includes a boost regulator (407) that is used to generate an internal reference signal for use throughout the radio communication device including an analog to digital converter (ADC) for digitizing the battery voltage for use by the power control circuitry (315). The power control circuitry (315) compares the digitized battery voltage to thresholds to control power to the remainder of the radio communication device (303). Additionally, a secondary comparator (413) is provided to prevent damage to the battery and radio communication device circuitry. The secondary comparator uses multiple undervoltage thresholds depending upon the power state of the radio communication device (303).

    摘要翻译: 便携式无线电通信设备(303)包括用于监测从电池(317)进入的电压电平的功率控制电路(315),并向无线电通信设备(303)的其余部分提供电力。 功率控制电路(315)包括升压调节器(407),其用于产生用于整个无线电通信设备的内部参考信号,所述内部参考信号包括用于将电池电压数字化以供功率控制使用的模数转换器(ADC) 电路(315)。 功率控制电路(315)将数字化电池电压与阈值进行比较,以控制无线电通信设备(303)的其余部分的功率。 此外,提供了一个次级比较器(413)以防止损坏电池和无线电通信设备电路。 次级比较器根据无线电通信设备(303)的功率状态使用多个欠压阈值。