| 摘要 |
Charge pump for providing an output current for charging and discharging a filter in accordance with an input signal, said charge pump comprising a first current source connectable with the input signal for driving the current source and adapted to providing a first current equal to a constant current Io plus a variable current Deltax, said variable current Deltax being directly proportional to the input signal, a second current source connectable with the input signal for driving the current source and adapted to providing a second current equal to the constant current I0 minus said variable current Deltax, and an output for providing the output current, wherein said output is connected to both the first and second current source in such a way, that the output current is equal to a difference between the first and second current.
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