Method and circuit of reducing current ripple output by current source

The invention discloses a method and a circuit of reducing current ripple output by a current source, wherein the circuit of reducing current ripple output by the current source comprises an impedance adjustable pipe and a control circuit. The method of reducing current ripple output by the current source includes the steps: controlling a direct current output by a circuit detection current source to obtain a first signal which is proportional to the direct current, controlling the impedance t of the impedance adjustable pipe to increase to enable the amplitude of the first signal not to exceed the amplitude of a preset signal by comparing the amplitude of the first signal and the amplitude of the preset signal when the amplitude of the first signal is larger than the amplitude of the preset signal, and therefore to enable the amplitude of the current output by the current source not to exceed the amplitude of the current output by the preset signal, and finally achieving a goal of reducing current ripple output by the current source.