Patent ID: 7969247
Filing Date: 2011-06-28
Classification: H03L

Abstract:
1. A charge pump circuit comprising: a first charge pump branch having a first charging current source that supplies a first charging current from a first supply terminal to a common node, and a first discharging current source that supplies a first discharging current from the common node to a second supply terminal; a second charge pump branch having a second charging current source that supplies a second charging current from the first supply terminal to the common node, and a second discharging current source that supplies a second discharging current from the common node to the second supply terminal; and an error cancellation circuit having a third charging current source that supplies a third charging current from the first supply terminal to the common node, and a third discharging current source that supplies a third discharging current from the common node to the second supply terminal, wherein the first charging current, the second charging current and the third discharging current are equal, and the first discharging current, the second discharging current and the third charging current are equal.