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    • 4. 发明公开
    • ANALOGUE TO DIGITAL CONVERTER
    • 模拟数字转换器
    • EP1046231A2
    • 2000-10-25
    • EP99947472.9
    • 1999-09-23
    • Koninklijke Philips Electronics N.V.
    • HUGHES, John, B.REDMAN-WHITE, WilliamBRACEY, Mark
    • H03M3/00
    • H03M1/0682H03M1/1215H03M1/1225H03M1/145H03M1/447
    • (57) Abstract A current mode pipelined analogue to digital converter (ADC) has a plurality of serially connected conversion stages. Each conversion stage has an input (40) for receiving a sampled and held current which is connected via a switch (S41) to a first current memory (M42) and via a switch (S40) to a second current memory (M41). The output of the second current memory (M41) is fed via a switch (S44) to one input of a summing junction (48). The output of the first current memory (M42) is fed via a switch (S42) to the input of a comparator (C43) whose output is clocked into a latch (L44) whose Q output is connected to an output (45) as the digital result of the conversion. The Q output of the latch (L44) is also connected to a digital to analogue converter (46) whose analogue output is fed to a second input of the summing junction (48) via a switch (S43) to form the analogue residue signal for application via output (47) to the next conversion stage in the pipeline. The stage has the advantage that the analogue signal is fed from stage to stage using only one current memory (M41) thus reducing transmission loss and that corruption of the analogue signal by comparator 'kick back' is avoided by using a further current memory (M42) in parallel with the signal path current memory (M41).
    • 5. 发明申请
    • SWITCHED-CURRENT ANALOGUE-TO-DIGITAL CONVERTER
    • 开关电流模拟数字转换器
    • WO2004010586A2
    • 2004-01-29
    • PCT/IB0303027
    • 2003-07-08
    • KONINKL PHILIPS ELECTRONICS NVHUGHES JOHN B
    • HUGHES JOHN B
    • H03M1/44H03M1/06H03M1/00
    • H03M1/0695H03M1/447
    • A current mode analogue-to-digital converter uses a conversion stage which operates using a two-phase clock and which requires the input signal to be present during only one of the phases. A sample-and-hold circuit (120, 130, 135) samples the input signal during the first clock phase and during the second clock phase a quantised bit value is generated from a mirror of the held input current by a kickback-free comparator circuit (140). Also during the second clock phase a residue is generated using the quantised value and a non-mirrored version of the held input current. Optionally, two comparator circuits (140, 140") may be used to provide two-level quantisation, enabling errors introduced by the current mirror to be corrected by a Redundant Signed Digit algorithm. Two pipelines of conversion stages (S
    • 电流模式模拟 - 数字转换器使用转换级,其使用两相时钟进行操作,并且需要在仅一个相位期间存在输入信号。 采样和保持电路(120,130,135)在第一时钟相位期间对输入信号进行采样,并且在第二时钟相位期间,通过无反冲比较器电路从保持的输入电流的反射镜产生量化位值 (140)。 同样在第二时钟阶段期间,使用量化值和保持的输入电流的非镜像版本来生成残差。 可选地,可以使用两个比较器电路(140,140“)来提供两级量化,使得由电流镜引入的误差能够通过冗余有符号数字算法来校正。转换级的两条管线(S