公开(公告)号：EP1899979A1

公开(公告)日：2008-03-19

申请号：EP06774451.6

申请日：2006-06-30

申请人： Cambridge Analog Technology, LLC

发明人： LEE, Hae-Seung

IPC分类号： G11C27/02

CPC分类号： G11C27/024 ,  H03H19/004 ,  Y10T307/74

摘要： A sampled-data analog circuit includes a level-crossing detector (30). The level-crossing detector controls sampling switches (s22n, s23n, s22p, s23p) to provide a precise sample of the output voltage when the level-crossing detector senses the predetermined level crossing of the input signal. The level-crossing detection may be a zero-crossing detection. An optional common-mode feedback circuit (400) can keep the output common-mode voltage substantially constant.

摘要翻译： 采样数据模拟电路包括电平交叉检测器（30）。 当电平交叉检测器检测到输入信号的预定电平交叉时，电平交叉检测器控制采样开关（s22n，s23n，s22p，s23p）以提供输出电压的精确采样。 电平交叉检测可以是零交叉检测。 可选的共模反馈电路（400）可以保持输出共模电压基本恒定。

公开(公告)号：EP1899980A1

公开(公告)日：2008-03-19

申请号：EP06786562.6

申请日：2006-06-30

申请人： Cambridge Analog Technology, LLC

发明人： LEE, Hae-Seung

IPC分类号： G11C27/02

CPC分类号： G11C27/024 ,  G11C27/026 ,  Y10T307/74

摘要： A sampled-data analog circuit includes a level-crossing detector (30). The level-crossing detector controls sampling switches (S22, S23) to provide a precise sample of the output voltage when the level-crossing detector senses the predetermined level crossing of the input signal. The level-crossing detection may be a zero-crossing detection. An optional common-mode feedback circuit can keep the output common-mode voltage substantially constant.

公开(公告)号：EP1999758A2

公开(公告)日：2008-12-10

申请号：EP07758608.9

申请日：2007-03-15

申请人： Cambridge Analog Technology, LLC

发明人： LEE, Hae-Seung

IPC分类号： G11C27/02 ,  H03K5/00 ,  H03K17/00

CPC分类号： H03H19/004 ,  G11C7/06 ,  G11C27/026 ,  H03M1/0607 ,  H03M1/403 ,  H03M1/442 ,  H03M3/356

摘要： A comparator based circuit with effective offset cancellation includes first and second amplifiers and an offset capacitor operatively connected to the first and second amplifiers. An offset voltage source generates an offset voltage. A first switch connects the offset voltage source to ground during a first time period. The first amplifier generates an output voltage in response to the first switch connecting the offset voltage source to ground during the first time period. A second switch connects the offset capacitor to ground during a second time period. The first switch disconnects the offset voltage source from ground during a third time period, and the second switch disconnects the offset capacitor from ground during the third time period.

公开(公告)号：EP1911161A1

公开(公告)日：2008-04-16

申请号：EP06800132.0

申请日：2006-07-18

申请人： Cambridge Analog Technology, LLC

发明人： LEE, Hae-seung

IPC分类号： H03M1/00 ,  G11C27/02

CPC分类号： G11C27/026 ,  G11C27/024 ,  H03K5/1536

摘要： A sample-data analog circuit includes a level-crossing detector. The level- crossing detector controls sampling switches to provide a precise sample of the output voltage when the level-crossing detector senses the predetermined level crossing of the input signal. A multiple segment ramp waveform generator is used in the sample-data analog circuits. The ramp waveform generator includes an amplifier, a variable current source, and a voltage detection circuit coupled to the current source to control the change in the amplitude of the current. The ramp generator produces constant slope within each segment regardless of the load condition. The sample-data analog circuit also utilizes variable bandwidths and thresholds.

摘要翻译： 采样数据模拟电路包括电平交叉检测器。 当电平交叉检测器检测到输入信号的预定电平交叉时，电平交叉检测器控制采样开关以提供输出电压的精确采样。 采样数据模拟电路使用多段斜坡波形发生器。 斜坡波形发生器包括放大器，可变电流源和耦合到电流源的电压检测电路，以控制电流幅度的变化。 无论负载情况如何，斜坡发生器都会在每个段内产生恒定斜率。 采样数据模拟电路还利用可变带宽和阈值。