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The shearing process for the sheet metal is normally used in the precision elements such as a lead frame of IC chips. In these precision elements, the burr formation brings a bad effect on the system assembly and demands the additional deburring process. In this paper, we developed the small size precision punching system to investigate burr formation mechanism and to present kinematically punch-die aligning methodology between the rectangular shaped punch and die. The punch is driven by an air cylinder and the sheet metal is moving on the X-Y table system which is driven by two stepping motors. The whole system is controlled by microprocessor and is communicated with each other by RS232C serial communication protocol. Punching results are measured manually using the SEM photographs and are compared aligning result with miss aligning one.
We have designed and fabricated a low power and high linearity up down convertor for wireless repeaters using 0.35 ㎛ SiGe Bipolar CMOS technology. Repeater is composed of a wideband up/down converting mixer, programmable gain amplifiers (PGA), input buffer, LO buffer, filter driver amplifier and integer-N phase locked loop (PLL). As of the measurement results, OIP3 of the down conversion mixer and up conversion mixer are 32 dBm and 17.8 dBm, respectively. The total dynamic gain range is 31 dB with 1 dB gain step resolution. The adjacent channel leakage ratio (ACLR) is 59.9 dBc. The total power consumption is 240 mA at 3.3 V.
Punching tools like an electrodes are made by milling or etching or EDM. These methods had time consuming, low efficiency and air pollution. So, we have developed a shearing device which counter punching method for burr less cutting of micro wire. Using the straightened SUS304 wire with 200 ㎛ diameter, we confirmed the tendency of the shear plane for punch tools. It was impossible to completely remove the burr in the shearing process. In order to minimize the burr size and fine shear plane, we have accomplished the various experiment conditions such as the U-groove, the effect of the counter punch, shear angle and clearance. The results of the experiments show that indentation, slip plane and bent shape were related to the shear angle and clearance.
We have designed and fabricated a linear drive amplifier with a novel intermodulation distortion (IMD) canceller using 0.18 ㎛ CMOS process. The drive amplifier with IMD canceller is composed of a cascode main amplifier and an additional common-source IMD canceller. Since the IMD canceller generates IM3 (3<SUP>rd</SUP>-order imtermodulation) signal with 180° phase difference against the IM3 of the cascode main amplifier, the IM3 power is drastically eliminated. As of the measurement results, OP1㏈, OIP3, and power-add efficiency are 5.5 ㏈m, 15.5 ㏈m, and 21 %, respectively. Those are 5 ㏈, 6 ㏈, and 13.5 % enhanced values compared to a conventional cascode drive amplifier. The IMD3 of the drive amplifier with IMD canceller is enhanced more than 10 ㏈ compared to that of the conventional cascode drive amplifier for input power ranges from -22 to -14 ㏈m.
We have designed and fabricated a 220V @ 60Hz AC non contact detection for AC power line detector using 180nm megna BCDMOS technology. AC line detector is composed of a 60Hz band pass filter, fixed gain amplifier, comparator and current generator. The 220V AC power line detector with non-contact is designed and fabricated by BCDMOS process. As of the measurement results, maximum detection range of the AC power line detector and differential gain are 30 cm and 20 dB, respectively. The total power consumption is 3mA at 3.3 V coin battery.