一种具有快速电压跟随和宽输出电压范围的电压模式DC-DC降压型变换器

A high switching frequency voltage-mode buck converter with fast voltage-tracking speed and wide output voltage range has been proposed. A novel error amplifier （EA） is presented to achieve a high DC gain and get high phase margin, including a resistor and capacitor net, a unit gain block and a high gain block. The investigated converter has been fabricated with GF 0.35 μm CMOS process and can operate at 6 MHz with the output voltage range from 0.6 to 3.4 V. The experimental results show that the voltage-tracking speed can achieve 8.8 μs/V for up-tracking and 6 μs/V for down-tracking. Besides, the recovery time is less than 8 μs while the load current suddenly changes 400 mA.     

沙棘黑全麦生鲜面的配方优化及品质评价

以黑全麦粉为主要原料,添加适量沙棘粉,以模糊数学感官得分为评价指标,通过响应面试验确定沙棘黑全麦生鲜面最佳配方.采用质构仪、电子鼻和电子舌辅助感官进行品质评价,并测定产品血糖生成指数(glycemic index,GI).结果 表明:沙棘黑麦生鲜面最佳配方为黑全麦粉100 g、食盐1.6 g、沙棘粉3.0 g、加液量4...