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This paper presents a design of a four phase 25% duty cycle of 400MHz DLL with calibration. To avoid the disadvantages of digital calibration method, it introduced an all-analog calibration method. Instead of DAC, CP is used in calibration loop to save power consumption and area occupying. With a 4 channel time-interleaved 6 bit flash ADC, the simulated results show that SNR is 30.8dB and 43.6dB with...
Based on Brokaw bandgap cell, an improved implementation of BGR which consists of a temperature compensated circuit and a simple feedback loop circuit is presented. The circuit exploits a high-order compensation method to realize a low TC and uses an op-amp-avoided feedback loop circuit to save the power dissipation. Implemented in 0.5μm BCD process, the proposed circuit achieves a TC of 1.9 ppm/°C...
Bacillus globisporus A95, a novel strain isolated from tea rhizosphere soil, showed broad-spectrum antifungal activity. Statistical optimization of the medium was applied to enhance the antifungal metabolites production. The Plackett-Burman Design revealed that soybean meal and CaCO3 significantly affected the active substances production. A 24-Central composite design was used for response surface...
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