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比例积分(PI)控制器是微陀螺自动增益控制(AGC)闭环驱动电路中的重要模块,常被用来改善闭环驱动电路的瞬态响应特性.但是,传统的PI控制器电路存在功耗、面积大的缺点.针对此问题,提出了一种Gm-C结构的PI控制器,其仅由一个片内的跨导放大器和片外电容电阻网络即同时实现了减法、比例和积分功能,显著减小了芯片功耗和面积.此外,提出了一种带温度补偿的跨阻放大器(TIA)结构的读出电路,将驱动轴振动速度幅值的温漂系数从补偿前的1 640×10-6/℃提高到了114×10-6/℃.设计的驱动电路芯片在0.35μm标准CMOS工艺下实现,工作电压为5 V.其中PI控制器的静态功耗小于1 mW,面积仅为0.18 mm×0.08 mm.芯片与微陀螺的联合测试结果表明,在PI控制器的比例系数和积分系数分别设置为10和200时,闭环驱动电路有最佳的瞬态响应.
Proportional-integral-integral (PI) controller is an important module in the gyro AGC closed-loop drive circuit and is often used to improve the transient response characteristics of the closed-loop drive circuit.However, the traditional PI controller circuit has power consumption, Large area.Aiming at this problem, a PI controller with Gm-C structure is proposed, which only achieves the functions of subtraction, scaling and integration by only one on-chip transconductance amplifier and off-chip capacitor resistance network, which is significant Reduce the chip power consumption and area.In addition, a readout circuit with a temperature-compensated transimpedance amplifier (TIA) structure is proposed, which converts the temperature drift coefficient of the vibration amplitude of the drive shaft from 1 640 × 10 -6 / ℃ to 114 × 10-6 / ℃. The designed driving circuit chip is implemented in a 0.35μm standard CMOS process with a working voltage of 5 V. The PI controller has a quiescent power consumption of less than 1 mW and an area of only 0.18 mm × 0.08 mm The combined test results of the chip and the micro-gyro show that the closed-loop drive circuit has the best transient response when the PI coefficient and the integral coefficient are set to 10 and 200, respectively.