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Note that an inverter between the PFD output and the DN or UP input of the charge pump may be required. In order to ensure that the switches turn on and off when the charge pump output voltages is close to the power-supply rails, the signal from the PFD must be a full rail-to-rail output buffer would be needed.....
下文中还有个mid-rail.......
中间的这个rail是什么意思啊? |
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