Patent ID: 6535051
Filing Date: 2003-03-18
Classification: H03L

Abstract:
A charge pump circuit comprising:an output node; a first current source for sourcing pump-up current to the output node; a first switching device connected between a first reference voltage node and the first current source and switched in response to a pump-up control signal; a second current source for sinking pump-down current from the output node; a second switching device connected between the second current source and a second reference voltage node, and switched in response to a pump-down control signal; a first dummy capacitor a first end of which is connected to a junction between the first switching device and the first current source; a second dummy capacitor a first end of which is connected to a junction between the second switching device and the second current source; and a reference current source connected between the first current source and the second current source for providing a reference current between the first current source and the second current source.