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With the development of digital very large scale integrated circuits (VLSI), how to reduce the power dissipation and improve the operation speed are two aspects among the most concerned fields. Based on sense amplifier technology and bulk-controlled technique, this paper proposes a bulk-controlled sense-amplifier D flip-flop (BCSADFF). Firstly, this flip-flop can change the threshold voltage of the NMOS by inputting control signals from the substrate so as to control the operating current. Secondly, the traditional RS flip-flop composed of two NAND gates is improved to a couple of inverters based on pseudo-PMOS dynamic technology. Therefore, the proposed BCSADFF can both effectively reduce the power dissipation and improve the circuit speed. Thirdly, the designed BCSADFF can work normally with ultra-dynamic voltage scaling from 1.8 V to 0.6V for SMIC 0.18-um standard CMOS process. Lastly, the Hspice simulation result shows that, compared with the traditional sense-amplifier D flip-flop (SADFF), the power dissipation of the BCSADFF is significantly reduced under the same operating conditions. When the power supply voltage is 0.9V, the power dissipation and delay of the SADFF is 6.54uW and 0.386ns while that of the proposed BCSADFF is 2.09uW and 0.237ns.

This paper proposes a tractor hydraulic lighten testing system based on OPC technology. OPC technology is well applied to Tractor Hydraulic Lighten Testing System. The host computer can directly communicate with PLC and AD module through OPC technology.The control circuit is greatly simplified, the entire experiments can be completed on PC.The operation is convenient; the system is reliable;the program is easy to debug;test types can choose automatic or manual mode.The actual test results show that the performance of device is stable and reliable.The automation degree of the test system is greatly improved, and the labor intensity of operators is greatly reduced.