Abstract: A static random access memory cell comprising a first inverter, a second inverter, a first transistor, a second transistor, and a third transistor. The first inverter is cross-coupled with the second inverter. The first transistor is connected with a write word line, a write bit line, and a first output node of the first inverter. The second transistor is connected with a complementary write bit line, the write word line, and a second output node of the second inverter. The third transistor is connected with a read bit line, a read word line, and the first input node of the first inverter to form a read port transistor, and a read port is formed. The read port transistor has a feature of asymmetric threshold voltage, and the read bit line swing can be expanded by the decrease of clamping current or the boosted read bit line.

Abstract: A static random access memory cell comprising a first inverter, a second inverter, a first transistor, a second transistor, and a third transistor. The first inverter is cross-coupled with the second inverter. The first transistor is connected with a write word line, a write bit line, and a first output node of the first inverter. The second transistor is connected with a complementary write bit line, the write word line, and a second output node of the second inverter. The third transistor is connected with a read bit line, a read word line, and the first input node of the first inverter to form a read port transistor, and a read port is formed. The read port transistor has a feature of asymmetric threshold voltage, and the read bit line swing can be expanded by the decrease of clamping current or the boosted read bit line.

Abstract: A low-noise fan-filter unit for providing filtered airflow is disclosed. The fan-filter unit includes a housing having at least an air inlet and a coaxial air outlet; a centrifugal fan installed in the housing for drawing air into the housing and propelling it out of the air outlet; a filter installed between the fan and the air outlet for removing impurities from the air; and a noise reduction arrangement installed between the fan and the filter for reducing noise. The noise reduction arrangements includes three parting plates incorporating with the housing to form a tortuous air passageway which U-turns the airflow at least two times. The tortuous and extended air passageway, and some sound-absorbing materials furnished along the air passageway increase the contact area between the airflow and the sound-absorbing materials, and enhance the effect of noise absorption.