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Charge pump system with multiple independently excited charge pumps and relative method

A charge pump, power supply voltage technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve problems such as increasing chip area

Inactive Publication Date: 2004-08-25
IBM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, doing so will directly increase the chip area

Method used

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  • Charge pump system with multiple independently excited charge pumps and relative method
  • Charge pump system with multiple independently excited charge pumps and relative method
  • Charge pump system with multiple independently excited charge pumps and relative method

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Embodiment Construction

[0031] figure 1 Shown is a block diagram of a generator system 10 according to a first embodiment of the present invention. In this embodiment, as with the other embodiments herein, charge transfer from the charge pump 20 to the generated supply voltage Vout is controlled in response to the supply voltage Vout reaching a plurality of predetermined voltage levels. The generator system includes a two-stage limiter 12 that changes the state of control signals C0 and C1 in response to the voltage level reached by Vout. Control signals C0 and C1 serve as inputs to oscillators 15 and 16 and charge pumps 20 and 30, respectively. Charge pumps 20 , 30 and limiter 12 receive a start input P1 from pump start circuit 18 . The control signals C0 and C1 respectively control the switching of the charge pumps 20 and 30 .

[0032] image 3 shown as available as figure 1A schematic diagram of the two-stage limiter 112 of the middle limiter 12. Limiter 112 includes a resistive divider form...

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PUM

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Abstract

A charge pump generator system and method is provided which more precisely maintains the level of an internally generated voltage supply by operating some or all of the available charge pumps depending upon the voltage level reached by the voltage supply. When the voltage supply is far from its target level, a first group and a second group of charge pumps are operated. The first group may preferably have a faster pumping rate or a greater number of charge pumps than the second group. When the voltage supply exceeds a first predetermined level, the first group of charge pumps is switched off while the second group remains on, such that the rate of charge transfer slows. The second group continues operating until a second, e.g. target, voltage level is exceeded. The slower rate of charge transfer then effective reduces overshoot, ringing and noise coupled onto the voltage supply line. Preferably, at least one charge pump operates in both standby and active modes, thereby reducing chip area.

Description

technical field [0001] This application is related to US Patent Application No. 09 / 430,807, filed October 29, 1999, and entitled "Charge Pump System with Multiple Charge Rates and Corresponding Method," which is hereby incorporated by reference in its entirety. [0002] The present invention relates to integrated circuits, and more particularly to methods of maintaining supply voltages generated within integrated circuits. Background technique [0003] It is often necessary to generate supply voltages inside integrated circuits. For example, memory circuits need to internally generate a special supply voltage as an enhanced wordline supply voltage (eg 3.3V) or as a negative wordline low supply voltage (eg -0.5V). A charge pump is a device that is easily incorporated into an integrated circuit and can be used to generate and maintain an internal supply voltage from an external supply voltage. [0004] By way of illustration only, and without intending to limit the meaning o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07
CPCH02M3/07
Inventor 路易斯·L.C.·苏奥利弗·维恩佛特纳马修·R.·沃德曼
Owner IBM CORP