Abstract: A capacitive ultrasonic transducer device includes a substrate, a first capacitive structure, a second capacitive structure, a first film structure and a second film structure. The first capacitive structure is disposed on the substrate, and includes a first electrode and a second electrode. A first gap and a dielectric layer are located between the first electrode and the second electrode. The second capacitive structure is disposed on the substrate, and includes a third electrode and a fourth electrode. A second gap is located between the third electrode and the fourth electrode. The first film structure is configured to seal the first gap. The second film structure is connected to the third electrode and the fourth electrode, and configured to seal the second gap. A first width between the first electrode and the second electrode is different from a second width of the second gap.

Abstract: An operational transconductance amplifier includes a fully-differential amplifying circuit, a bias driving circuit, and a common mode feedback circuit. The fully-differential amplifying circuit is configured for receiving a differential input voltage and providing a differential output voltage. The fully-differential amplifying circuit includes a plurality of diffusor-differential-pair circuits. The bias driving circuit is configured for providing at least one first bias current to drive the fully-differential amplifying circuit and adjust the transconductance of the transconductance amplifier. The common mode feedback circuit is configured for stabilizing the differential output voltage. An operational transconductance amplifier-capacitor (OTA-C) filter and a high order filter are disclosed herein as well.

Abstract: An operational transconductance amplifier includes a fully-differential amplifying circuit, a bias driving circuit, and a common mode feedback circuit. The fully-differential amplifying circuit is configured for receiving a differential input voltage and providing a differential output voltage. The fully-differential amplifying circuit includes a plurality of diffusor-differential-pair circuits. The bias driving circuit is configured for providing at least one first bias current to drive the fully-differential amplifying circuit and adjust the transconductance of the transconductance amplifier. The common mode feedback circuit is configured for stabilizing the differential output voltage. An operational transconductance amplifier-capacitor (OTA-C) filter and a high order filter are disclosed herein as well.

Abstract: A pair of spectacles has a first frame, a second frame, a first temple, a second temple, a first lens, and a second lens. The first temple has a first annular end. The second temple has a second annular end. The first frame has a first joint, a second joint, a first middle portion, a first notch, and a second notch. The second frame has a third joint, a fourth joint, a second middle portion, a third notch, and a fourth notch. The first middle portion intersects the second middle portion. The first notch engages with the third notch. The second notch engages with the fourth notch. The first annular end is disposed between the first joint and the third joint. The second annular end is disposed between the second joint and the fourth joint.

Abstract: A lens locator positions a pair of lenses. The lens locator has a plurality of buckles and a connector which is made a of titanium-nickel alloy. The buckle has a hook extending from one end of the buckle and a generally U-shaped groove defined by the buckle. The U-shaped groove receives a lens of the sunglasses while folded and the U-shaped groove receives a lens of regular glasses while the sunglasses are in.