1. A circuit comprising: an integrator configured to receive an input current, wherein the integrator includes: a first amplifier and a second amplifier, wherein first amplifier is configured to receive the input current at a first input of the first amplifier, and an output of the first op-mp is configured to drive a first input of the second amplifier; a pull-up current source selectively coupled to the first input of the second amplifier; and a pull-down current source selectively coupled to the first input of the second amplifier; wherein if the absolute value of the input current is larger than a predefined threshold current: the pull-up current source is configured to drive current into the first input of the second amplifier for a first polarity of the input current, and the pull-down current source is configured to sink current from the first input of the second amplifier for a second polarity of the input current.