【 中文摘要 】本发明公开一种片上有源RC滤波器的分压积分型时常数校准电路，本发明包括比较器电路、数字控制器、积分器电路、成比例电阻电路和开关电路。所述成比例电阻电路与积分器电路的双端输入端相连，积分器电路的输出与开关电路的输入端相连。所述开关电路的输出端与比较器电路相连，比较器电路与数字控制器相连。所述的数字控制器与积分器电路的数字可编程电容的数字控制字端相连。本发明采用积分器电路、成比例电阻电路和开关电路，省去对精确电流源的需求，降低了电路设计的复杂程度，减少了芯片的功耗，提高校准精度且易于片上集成。

【 英文摘要 】The invention discloses a voltage division integral type time constant calibration circuit of an on-chip active RC filter. The voltage division integral type time constant calibration circuit comprises a comparator circuit, a digital controller, an integrator circuit, a proportional resistance circuit and a switching circuit. The proportional resistance circuit is connected with the double-end input end of the integrator circuit, and the output end of the integrator circuit is connected with the input end of the switch circuit. The output end of the switch circuit is connected with the comparator circuit, and the comparator circuit is connected with the digital controller. The digital controller is connected with the digital control word end of the digital programmable capacitor of the integrator circuit. By adopting the integrator circuit, the proportional resistance circuit and the switching circuit, the requirement on an accurate current source is saved, the complexity of circuit design is reduced, the power consumption of a chip is reduced, the calibration precision is improved, and on-chip integration is easy.

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