公开(公告)号：US06445623B1

公开(公告)日：2002-09-03

申请号：US09934931

申请日：2001-08-22

Applicant: Haoran Zhang ,  Gregory S. Waterfall

Inventor： Haoran Zhang ,  Gregory S. Waterfall

IPC: G11C700

CPC classification number: H02M1/44 ,  G11C5/145 ,  H02M3/07

Abstract: A charge pump circuit is provided for reducing the voltage ripple and EMI associated with prior art circuits. The charge pump circuit is configured with at least one current source for suitably controlling the charging and/or discharging current in the charge pump capacitors the currents of the current sources are determined by the load current requirements, rather than the on-resistance of any switches or the ESR of any capacitors, thus allowing a significant reduction of the peak current drawn from the power supply as well as the peak current injected into the output reservoir capacitor. The charge pump circuit can be configured with a current source in series with the input supply voltage to control the total current in the charge pump. In addition, the charge pump circuit can be configured with current limited switches for controlling the total current. For example, current sources can be suitably configured to replace one or more switches in the charge pump circuit to effectively control the total current in the charge pump circuit. By feeding the charge pump capacitors with switched current sources, the voltage across the current sources can be suitably limited to the supply voltage or the output voltage. In addition, the current sources can operate as resistor devices with adjustable impedances, and be configured to suitably reduce or eliminate the excessive supply voltage across the current sources. Further, the switched current sources can comprise various current mirror configurations. As a result, the requirement for the breakdown voltage can be significantly reduced. In addition, through use of a low voltage process, the cost and packaging size can be suitably reduced.

Abstract translation: 提供电荷泵电路用于降低与现有技术电路相关联的电压纹波和EMI。 电荷泵电路配置有至少一个电流源，用于适当地控制电荷泵电容器中的充电和/或放电电流，电流源的电流由负载电流要求决定，而不是任何开关的导通电阻 或任何电容器的ESR，从而允许从电源吸取的峰值电流以及注入输出储能电容器的峰值电流显着降低。 电荷泵电路可以配置有与输入电源电压串联的电流源，以控制电荷泵中的总电流。 此外，电荷泵电路可以配置有用于控制总电流的电流限制开关。 例如，电流源可以被适当地配置成替换电荷泵电路中的一个或多个开关，以有效地控制电荷泵电路中的总电流。 通过向电荷泵电容器馈送开关电流源，电流源两端的电压可以适当地限于电源电压或输出电压。 此外，电流源可以作为具有可调阻抗的电阻器件工作，并且被配置为适当地减少或消除电流源上的过大电源电压。 此外，开关电流源可以包括各种电流镜配置。 结果，可以显着地降低击穿电压的要求。 此外，通过使用低电压工艺，可以适当降低成本和封装尺寸。

公开(公告)号：US5367302A

公开(公告)日：1994-11-22

申请号：US111113

申请日：1993-08-24

Applicant: Timothy V. Kalthoff ,  Gregory S. Waterfall

Inventor： Timothy V. Kalthoff ,  Gregory S. Waterfall

IPC: H03M1/80 ,  H03M1/50

CPC classification number: H03M1/804

Abstract: A current integrating analog-to-digital converter includes a comparator having a non-inverting input coupled to receive a ground voltage and an inverting input coupled to an input conductor, with an input current flowing through the input conductor, an integrating capacitor having a first terminal coupled by an isolation switch to the input conductor. A reset circuit is coupled to the integrating capacitor and is operative to reset the integrating capacitor before each integrating cycle. A digital-to-analog converter, which may be a CDAC, has an output coupled to a second terminal of the integrating capacitor, which may constitute the capacitors of the CDAC. An input of a tracking circuit is coupled to an output of the comparator to produce digital signals on digital inputs of the digital-to-analog converter to maintain the input of the comparator close to a virtual ground voltage, a digital signal on the inputs of the digital-to-analog converter representing the integral of the input current. The isolation switch opens during transients occurring on a charge summing conductor during digital-to-analog converter update and reset operations. An internal reset switch is coupled between a reference conductor and the first level. An external switch is coupled between ground and the input conductor.

Abstract translation: 电流积分模数转换器包括具有耦合以接收接地电压的非反相输入和耦合到输入导体的反相输入的比较器，其中输入电流流过输入导体，积分电容器具有第一 端子通过隔离开关耦合到输入导体。 复位电路耦合到积分电容器，并且可操作以在每个积分周期之前复位积分电容器。 可以是CDAC的数/模转换器具有耦合到积分电容器的第二端子的输出，其可以构成CDAC的电容器。 跟踪电路的输入耦合到比较器的输出端，以在数/模转换器的数字输入端产生数字信号，以保持比较器的输入接近虚拟接地电压，输入端的数字信号 数模转换器表示输入电流的积分。 在数模转换器更新和复位操作期间，在充电求和导体发生瞬变期间，隔离开关打开。 内部复位开关耦合在参考导体和第一电平之间。 外部开关耦合在地和输入导体之间。