The invention discloses an
integrator with a wide output range and high precision. The inverting input end of an
operational amplifier is connected with one end of a first switch, one end of an integrating
current source, one end of an integrating
capacitor and one end of a reset switch, the other end of the first switch is connected with one end of a first
current source, the other end of the integrating
capacitor is connected with the output end of the
operational amplifier, the other end of the reset switch is connected with one end of the first
resistor, the other end of the first resistoris connected with the output end of the
operational amplifier, and the non-inverting input end of the operational
amplifier is connected with a reference
signal VCM; the current directions of the integral
current source and the first current source are opposite, and the current value output by the first current source is larger than that output by the integral current source. The output
voltage of the
integrator in the reset state can be flexibly set, the operational
amplifier structure can be flexibly adopted to improve the performance of the whole circuit, and the performance of the integral current source generation circuit can be improved.