公开(公告)号：US5565869A

公开(公告)日：1996-10-15

申请号：US288416

申请日：1994-08-09

申请人： Benjamin T. Brodie ,  John D. Witters

发明人： Benjamin T. Brodie ,  John D. Witters

IPC分类号： H03M1/16 ,  H03M1/52

CPC分类号： H03M1/162 ,  H03M1/52

摘要： A multiple slope integrating analog-to-digital converter (ADC) includes an integrator and a comparator in which an input voltage to be measured is applied to a summing node at the input of the integrator during an integrate cycle, while at the same time positive and negative reference currents are selectively applied to the summing node by a controller which monitors the output of the comparator in order to come as close as possible to nulling the voltage magnitude at the output of the integrator. A controller keeps track of the charge that has been added to and removed from the integrator during the integrate cycle, and provides a coarse conversion value. The residual voltage is de-integrated to provide a fine conversion value, which is added to the coarse conversion value to provide a final value.The switches which control selection of the positive and negative reference currents are implemented and operated in such a way that linear error due to current injected into the integrator is minimized, and increased conversion speed is exhibited. At any given time during the integrate cycle, only one switch at a time is ON.

摘要翻译： 集成模数转换器（ADC）的多重斜率包括积分器和比较器，其中待测量的输入电压在积分周期内被加到积分器输入端的求和节点，同时为正 并且负参考电流由监控比较器的输出的控制器选择性地施加到求和节点，以便尽可能接近于积分器的输出处的电压幅值。 控制器跟踪在积分周期内已经加入积分器和从积分器中移除的电荷，并提供粗转换值。 剩余电压被去积分以提供精细转换值，其被加到粗转换值以提供最终值。 控制正参考电流和负参考电流选择的开关以这样的方式被实现和操作，使得由于注入到积分器中的电流引起的线性误差被最小化，并且显示出提高的转换速度。 在集成周期中的任何给定时间，每次只有一个开关为ON。