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改进了一种精确恒定跨导偏置电路,通过对电流和晶体管尺寸的设计使主电路跨导恒等于外接高精度电阻跨导,与传统结构相比具有更高的精度。将该偏置电路应用于无线传感网芯片中9阶Gm-C椭圆低通滤波器的设计,使该滤波器省去了片上调谐电路的设计,在降低功耗的同时提高了精度,节省了面积。设计基于SMIC 0.18μm 1.8 V 1P6M CMOS工艺,芯片面积仅为0.9 mm×0.22 mm,测试结果表明,该滤波器的截止频率与设计值相差在1%以内,输入噪声电压小于25 nV/Hz,消耗电流仅为0.9 mA,满足无线传感网节点芯片的要求。
An accurate and constant transconductance biasing circuit is improved. By designing the current and transistor dimensions, the transconductance of the main circuit is equal to the transconductance of an external high-precision resistor, which has higher accuracy than the conventional structure. The bias circuit is applied to the design of 9-order Gm-C elliptic low-pass filter in wireless sensor network chip, which eliminates the need of on-chip tuning circuit design, improves the precision while reducing the power consumption, saves The area. The design is based on the SMIC 0.18μm 1.8 V 1P6M CMOS process with a chip area of only 0.9 mm × 0.22 mm. The test results show that the cut-off frequency of the filter is within 1% of the designed value and the input noise voltage is less than 25 nV / Hz. Current is only 0.9 mA, to meet the wireless sensor network node chip requirements.