Abstract: An operational amplifier circuit is provided. The operational amplifier circuit includes a differential input stage circuit and a loading stage circuit. The differential input stage circuit includes a first current source, a first transistor, a second transistor, a third transistor, and a fourth transistor. The control terminal of the first transistor receives a first input signal. The control terminal of the second transistor receives a second input signal. The third transistor has a first terminal coupled to the second terminal of the first transistor, a second terminal coupled to the first current source, and a control terminal coupled to the control terminal of the second transistor. The fourth transistor has a first terminal coupled to the second terminal of the second transistor, a second terminal coupled to the first current source, and a control terminal coupled to the control terminal of the first transistor.

Abstract: A capacitive touch apparatus and a sensing method thereof are provided. The capacitive touch apparatus includes an electrostatic detection panel, and a sensing device. The sensing device is coupled to the electrostatic detection panel, and configured to sense a variation of electrostatic field on the electrostatic detection panel, and generate at least one touch sensing signal accordingly.

Abstract: When a NAS apparatus is directly connected to a network and an external apparatus simultaneously, the external apparatus is able to access the NAS apparatus, and the NAS apparatus concurrently communicates with the network for executing a specific function. A method of configuring the NAS apparatus includes: allocating a first storage unit in the NAS apparatus; and setting an attribute of the first storage unit such that the first storage unit is allowed to be read by the NAS apparatus or the external apparatus, and written by the NAS apparatus or the external apparatus.

Abstract: A source driver eliminates the need for a level shifter and enables the use of a low voltage digital-to-analog converter by using an operational buffer that performs voltage amplification in addition to driving a TFT panel.

Abstract: A low DC power rail-to-rail buffer amplifier is suitable for liquid crystal display application. The buffer amplifier comprises: a dc bias stage, a pair of complementary differential amplifiers, a second stage amplifier, and output stage. The dc bias stage is used for the dc bias of the differential amplifiers and the second stage to obtain a rail-to-rail operation. This buffer amplifier can be operated in the power supply ranges of 5.5 V to the breakdown voltage. Simulated results show that the circuit draws only 5.3 ?A static current.

Abstract: A low DC power rail-to-rail buffer amplifier is suitable for liquid crystal display application. The buffer amplifier comprises: a dc bias stage, a pair of complementary differential amplifiers, a second stage amplifier, and output stage. The dc bias stage is used for the dc bias of the differential amplifiers and the second stage to obtain a rail-to-rail operation. This buffer amplifier can be operated in the power supply ranges of 5.5 V to the breakdown voltage. Simulated results show that the circuit draws only 5.3 ?A static current.

Abstract: A water filtering apparatus with water flow switch valve device includes a water container filled with filtering materials and a switch valve device. The switch valve device includes a valve seat, a split valve, a control rod, and a valve cover. The valve seat is provided with threaded holes for connection with water pipes. The split valve has an interior divided into two isolated and non-communicating chambers. The outer wall of the split valve enclosing the chambers is provided with spaced water holes. When the split valve is installed in the valve seat and the valve cover is assembled to the valve seat, the split valve may be used to control the direction of flow of water into the water container for purposes of filtering water or purging the water container.