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    • 53. 发明公开
    • Low power high speed analog to digital converter
    • Hochgeschwindigkeits-Analog / Digital-Wandler mit niedriger Leistungsaufnahme。
    • EP0159709A2
    • 1985-10-30
    • EP85104992.4
    • 1985-04-24
    • VITAFIN N.V.
    • Mensink, Kornelis A.Brouwer, Henk L.
    • H03M1/38
    • H03M1/44
    • Apparatus and method for converting an analog signal into a digital signal, utilizing three closely matched capacitors C 1 , C 2 , C 3 ) on a CMOS chip. A reference voltage is first sampled, divided and then compared with a sampled analog voltage, the comparison resulting in a first bit signal. If the bit signal is a 1, the divided signal is substracted from the sampled analog signal. After the initial sampling, the series of steps is carried n times to generate an n bit signal. The utilization of CMOS circuitry and just the three low capacitance capacitors, only two of which are charged during a conversion, results in extremely low power operation.
    • 在CMOS芯片上利用三个紧密匹配的电容器C1,C2,C3将模拟信号转换为数字信号的装置和方法。 参考电压首先被采样,分频,然后与采样的模拟电压进行比较,比较产生第一位信号。 如果位信号为1,则分频信号从采样的模拟信号中减去。 在初始采样之后,执行一系列步骤n次以产生n位信号。 CMOS电路的利用和仅三个低容量电容器,其中只有两个在转换期间被充电,导致极低的功率操作。
    • 58. 发明公开
    • A/D CONVERTER CIRCUIT
    • 模拟 - 数字 - WANDLERSCHALTKREIS
    • EP2528236A1
    • 2012-11-28
    • EP11734761.7
    • 2011-01-21
    • NEC Corporation
    • NOGUCHI, Hidemi
    • H03M1/44
    • H03M1/445H03M1/204H03M1/44
    • There are provided an A/D conversion circuit and a method for avoiding an unstable operation caused by discontinuity in a direct-current transfer characteristic of the A/D conversion circuit. Each of cascade-connected one-bit A/D converters (10) includes first and second amplifier circuits (11, 12), a third amplifier circuit (13) that outputs an interpolation value (intermediate value) of outputs of the first and second amplifier circuits, a comparator (14) that outputs a binary signal whose value is determined by a polarity of an output of the third amplifier circuit, and a selector (16) that selects two of three outputs (Va, Vb, Vc) of the first to third amplifier circuits (11∼13), based on a value of the comparator (14). In the one-bit A/D converter, a voltage segment [A - C] or [C - B], where C indicates the midpoint of a voltage segment [A - B] of an input voltage, is identified to output a 1-bit signal. A logic configuration of the selector (16) is set such that direct-current transfer characteristics of two outputs of the selector of the one-bit A/D converter are folded at the midpoint C of the voltage segment [A - B] and are symmetrical relative to the midpoint C of the voltage segment [A - B].
    • 提供了A / D转换电路和避免由于A / D转换电路的直流传递特性的不连续性引起的不稳定操作的方法。 每个级联连接的一位A / D转换器(10)包括第一和第二放大器电路(11,12),第三放大器电路(13),其输出第一和第二放大器的输出的内插值(中间值) 放大器电路,输出二值信号的比较器(14),该二进制信号的值由第三放大器电路的输出的极性决定;以及选择器(16),其选择三个输出(Va,Vb,Vc)中的两个 第一到第三放大器电路(11¼13),基于比较器(14)的值。 在一位A / D转换器中,识别输入电压的电压段[A-B]的中点,其中C表示电压段[A-C]或[C-B],以输出1 位信号。 选择器(16)的逻辑配置被设置为使得一比特A / D转换器的选择器的两个输出的直流传输特性在电压段[A-B]的中点C被折叠,并且是 相对于电压段[A-B]的中点C对称。