公开(公告)号：US20090039924A1

公开(公告)日：2009-02-12

申请号：US11891211

申请日：2007-08-09

申请人： Alfio Zanchi ,  Randall V. Jack ,  David Thomas ,  Richard Reay ,  Fwurong Marco Pan

发明人： Alfio Zanchi ,  Randall V. Jack ,  David Thomas ,  Richard Reay ,  Fwurong Marco Pan

IPC分类号： G11C27/02

CPC分类号： G11C27/024

摘要： Circuits and methods that improve the performance of electronic sampling systems are provided. Parasitic capacitance associated with bootstrap circuitry is reduced, thereby decreasing signal distortion caused by capacitive loading at the input of the sampling circuit. The impedance of a sampling semiconductor switch is maintained substantially constant during sample states, at least in part, by accounting for non-linear parasitic capacitances associated with a sampling switch control terminal in order to reduce or minimize signal distortion associated with sampled signals that pass through the sampling switch.

摘要翻译： 提供了提高电子采样系统性能的电路和方法。 与自举电路相关联的寄生电容减少，从而降低由采样电路的输入处的电容性负载引起的信号失真。 采样半导体开关的阻抗在采样状态期间保持基本恒定，至少部分地通过考虑与采样开关控制端子相关联的非线性寄生电容，以便减少或最小化与通过的采样信号相关联的信号失真 采样开关。

公开(公告)号：US08324957B2

公开(公告)日：2012-12-04

申请号：US12949722

申请日：2010-11-18

申请人： David Thomas ,  Richard Reay

发明人： David Thomas ,  Richard Reay

IPC分类号： H03K17/04 ,  H03K17/687

CPC分类号： G05F3/262

摘要： A current source is switchable between two precisely defined output currents. A terminal of a coupling capacitor is coupled to the gate of an output MOSFET. The other terminal of the capacitor is switched between two reference voltages to toggle the output MOSFET to output the selected one of the two currents. A switchable bias voltage source is coupled to the gate only during the on state of the output MOSFET to set the gate voltage of the output MOSFET. The current output of the current source is quickly and accurately changed. A reference MOSFET is not directly coupled to the output MOSFET, so there are no slow settling components coupled to the gate of the output MOSFET.

摘要翻译： 电流源可在两个精确定义的输出电流之间切换。 耦合电容的端子耦合到输出MOSFET的栅极。 电容器的另一个端子在两个参考电压之间切换，以切换输出MOSFET以输出两个电流中选择的一个。 仅在输出MOSFET的导通状态下，可切换偏置电压源才耦合到栅极，以设置输出MOSFET的栅极电压。 电流源的当前输出快速准确地改变。 参考MOSFET不直接耦合到输出MOSFET，因此没有与输出MOSFET的栅极耦合的缓慢的稳定元件。