公开(公告)号：US09341655B2

公开(公告)日：2016-05-17

申请号：US14501587

申请日：2014-09-30

Applicant: GLOBALFOUNDRIES INC.

Inventor： Paul D. Muench ,  Donald W. Plass ,  Michael A. Sperling

IPC: G11C16/30 ,  H02M3/07 ,  G01R19/00 ,  G05F1/00 ,  G06F1/26 ,  G06F1/30

CPC classification number: G01R19/0023 ,  G05F1/00 ,  G06F1/26 ,  G06F1/30 ,  H02M3/07

Abstract: A method for operating a charge pump that supplies switching current for a plurality of transistors includes a capacitor generating a pumped voltage. A comparator generates a pump control signal for turning on and off charging of the pump capacitor based on a difference between a comparison voltage and a reference voltage. A direct voltage sensor receives a feedback signal reflecting the pumped voltage and generates the comparison voltage in response to the feedback signal. The sensor includes a sensor resistor, a current source configured to drive a sensor current through the sensor resistor, and a differential op-amp that drives the sensor current to cause the voltage drop across the sensor resistor to remain constant as the pumped voltage experiences the voltage drop. The charge pump may include two similar direct voltage sensor controlling positive and negative pumped voltages.

Abstract translation: 用于操作为多个晶体管提供开关电流的电荷泵的操作方法包括产生泵浦电压的电容器。 比较器基于比较电压和参考电压之间的差产生用于打开和关闭泵电容器的充电的泵控制信号。 直接电压传感器接收反映泵浦电压的反馈信号，并响应于反馈信号产生比较电压。 该传感器包括一个传感器电阻器，一个电流源，用于驱动传感器电流通过传感器电阻器;以及差分运算放大器，驱动传感器电流，导致传感器电阻上的电压降保持不变，因为泵浦电压经历 电压下降。 电荷泵可以包括两个相似的直接电压传感器来控制正和负的泵浦电压。