8 results about "Charge pump" patented technology

A semiconductor integrated circuit having a built-in PLL circuit which has two charge pump circuits for charging and discharging capacitive elements of a loop filter in response to signals generated by a phase comparator circuit. One of the two charge pump circuits has current sources which generate current values smaller than those generated by current sources of the other charge pump circuit. The loop filter has a first capacitive element connected to a charge/discharge node, and a second capacitive element connected to the charge/discharge node through a resistive element. The first capacitive element is charged and discharged by the one charge pump circuit, while the second capacitive element is charged and discharged by the other charge pump circuit. A charging current source of the one charge pump circuit operates simultaneously with a discharging current source of the other charge pump circuit, i.e., the charge pump circuits operate in opposite phase.

The invention relates to a charge pump which comprises a pump capacitor, a switch module, a first switch, a switching switch, an output capacitor and a wave interruption circuit, wherein the pump capacitor is used for generating pump voltage, the switch module and the first switch are respectively coupled with both ends of the pump capacitor, and the switching switch is coupled with the first switch and the pump capacitor to switch the pump capacitor to output the pump voltage. The output capacitor is coupled with the switching switch and the pump capacitor to output the pump voltage output bythe pump capacitor, and the wave interruption circuit is coupled between the pump capacitor and the output capacitor to avoid the conduction of a parasitic transistor of the switching switch so as toavoid charge loss, so that the power efficiency of the charge pump is improved, the ascending or descending time of the output voltage is reduced when started, and the reliability of a circuit underthe environment of high temperature is increased.

A charge pump control circuit that four main parts: a clock control circuit; a clock switch and driver circuit; a pump stage; and a dynamic load control circuit. The clock control circuit has a dynamic load that is controlled by the dynamic load control circuit. When the charge pump control circuit is enabled, the dynamic capacitive load is applied which incorporates a delay allowing the high frequency clock to control the pump stage and quickly charge the output to the desired boosted voltage. This provides a very fast boosted output voltage during a startup condition. Once the desired output voltage is realized, the dynamic capacitive load is disabled and the low frequency clock takes over the operation. During each low frequency clock cycle, the high frequency clock is enabled for several cycles per cycle of the low frequency clock.

A ring boost circuit has a first switching device coupled to a ring node. The first switching device is responsive to a ring operation. A charge pump is connected to the ring node, and the charge pump provides a voltage offset to enhance a differential voltage between the ring node and a tip node when the first switching device is activated during the ring operation.