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    • 4. 发明公开
    • A/D converter
    • A / D-Wandler
    • EP1239593A2
    • 2002-09-11
    • EP01309751.4
    • 2001-11-20
    • FUJITSU LIMITED
    • Yoshioka, Masato, c/o Fujitsu LimitedTsukamoto, Sanroku, c/o Fujitsu Microelectronics
    • H03M1/16
    • H03M1/1215H03M1/069H03M1/1004H03M1/1023H03M1/146H03M1/205H03M1/365
    • An A/D converter comprises: a differential amplifier row (2) for amplifying differential voltages between an analog input voltage (VIN) and reference voltages (VRL, VR 1 ,..VR 5 , VRH); a first sample/hold circuit row (3) for sampling/holding the individual differential voltages amplified; a second sample/hold circuit row (4) having a pair of second and third sample/hold circuits connected in parallel to each output of the first sample/hold circuit row (3), thereby performing alternate sampling; a plurality of comparators (5) for determining whether the individual differential voltages held by the first sample/hold circuit row are positive or negative; and an encoder (6) for outputting digital code corresponding to the outputs of the comparators.
    • A / D转换器包括:用于放大模拟输入电压(VIN)和参考电压(VRL,VR1,VR5,VRH)之间的差分电压的差分放大器行(2)。 用于采样/保持放大的各个差分电压的第一采样/保持电路行(3) 具有与第一采样/保持电路行(3)的每个输出并联连接的一对第二和第三采样/保持电路的第二采样/保持电路行(4),从而进行交替采样; 多个比较器(5),用于确定由第一采样/保持电路行保持的各个差分电压是正还是负; 以及用于输出与比较器的输出相对应的数字代码的编码器(6)。
    • 5. 发明公开
    • FOLDING STAGE AND FOLDING ANALOG-TO-DIGITAL CONVERTER
    • 折叠舞台折叠模拟/数字转换器
    • EP0722633A1
    • 1996-07-24
    • EP95921102.0
    • 1995-06-27
    • Philips Electronics N.V.
    • NAUTA, BramVENES, Arnoldus, Gerardus, Wilhelmus
    • H03M1
    • H03M1/205H03M1/141
    • A folding stage (FB) for a folding analog-to-digital converter, the folding stage (FB) comprising: reference means having a plurality of consecutive reference terminals (RT1..RT11) for providing ascending different reference voltages; a first summing node (SNa), a second summing node (SNb) and a first output node (ONa); a plurality of differentially coupled transistor pairs (TAi/TBi), each one of the pairs comprising a first transistor (TAi) having a main current path and a control electrode which is coupled to an input terminal (IT) for receiving an input voltage to be folded and a second transistor (TBi) having a main current path and a control electrode which is coupled to a respective one (RTi) of the consecutive reference terminals, the main current path of the first transistor (TAi) of consecutive transistor pairs being coupled alternately to the first summing node (SNa) and the second summing node (SNb), and the main current path of the associated second transistor (TBi) being coupled alternately to the second summing node (SNb) and the first summing node (SNa); and current-to-voltage converter means (IVCONV) comprising a first resistor (12) connected between the first output node (ONa) and the first summing node (SNa) to provide a first output voltage (Va) and a transconductance stage (2) having an inverting input (4) coupled to the first summing node (SNa) and an output (8) coupled to the first output node (ONa). The low input impedance of the current-to-voltage converter means (IVCONV) prevents high voltage swing at the summing nodes and reduces capacitive signal current flow. The current-to-voltage converter means (IVCONV) further provides a high output voltage swing despite of loading with a low-ohmic interpolation network.