Charge pump of a phase locked loop with switchable system bandwidth and method for controlling such a charge pump

A charge pump of a phase locked loop and method thereof, includes a first current source that supplies a first additive partial current to a node, a first current sink that draws a first subtractive partial current from the node, a second current source that supplies a second additive partial current to a node, and a second current sink that draws a second subtractive partial current from the node, wherein a sum of the currents (I- 2 +, I- 1 -) provides a charge current for a loop filter of the phase locked loop and a sum of the currents (I- 1 +, I- 2 -) provides a discharge current for the loop filter. The charge pump also includes a first current control element and a second current control element. The first current control element controls the sum of the first additive partial current (I- 1 +) and the second subtractive partial current (I- 2 -), and the second current control element controls the sum of the first subtractive partial current (I- 1 -) and the second additive partial current (I- 2 +).