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The error amplifier for PWM controller is designed. The amplifier has high open loop gain and power supply rejection ratio (PSRR). The circuit is simulated by CADENCE Spectre, and layout is done based on the process flow and layout levels of bipolar 45V process provided by HUAYUE Microelectronics Company. The test results proved that the error amplifier present in this paper meet the design requirements.
Considered lumen elastic deformation, modified Reynolds equation is deduced based on body fluid non-Newtonian model in this paper. The influence of main structure parameters of the medical micro-robot on minimum mucus film thickness and driving force is studied. Under the given condition optimal values of structure parameters are predicted and this can be used in practical condition.
To promote students' learning interest and improve teaching effect, this paper establishes a virtual teaching platform of digital design and manufacturing for teaching reform of numerical control (NC) specialty. Based on analyzing the problems existing in current major teaching with traditional teaching method, the significance of adopting virtual teaching platform is illuminated firstly. Then the...
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