Abstract: An amplifier circuit includes an amplifier and a noise suppression block. The amplifier is arranged for receiving an input signal at an input port and generating an output signal at an output port according to the input signal. The noise suppression block is coupled between the input port and the output port of the amplifier, and arranged for receiving the input signal and the output signal and applying noise suppression to the output signal generated from the amplifier according to the received input signal and the received output signal.

Abstract: An amplifier circuit includes an amplifier and a noise suppression block. The amplifier is arranged for receiving an input signal at an input port and generating an output signal at an output port according to the input signal. The noise suppression block is coupled between the input port and the output port of the amplifier, and arranged for receiving the input signal and the output signal and applying noise suppression to the output signal generated from the amplifier according to the received input signal and the received output signal.

Abstract: A single-phase down-converter includes a mixer and a local oscillator (LO) signal generator. The mixer is arranged to generate a mixer output signal by mixing a radio frequency (RF) signal and an LO signal. The LO signal generator is coupled to the mixer, and arranged to generate the LO signal with a frequency shifted from an RF carrier frequency by a specific intermediate frequency, wherein when image interference exists, the specific intermediate frequency makes the image interference translated to guard band(s) of channel(s).

Abstract: An echo cancellation circuit for an RFID reader and the method thereof are provided. The echo cancellation circuit includes a gain calculator, a gain adjustment circuit, and a subtraction circuit. The gain calculator provides a complex gain value according to a carrier signal and a received signal through an adaptive algorithm. The gain adjustment circuit is coupled to the gain calculator. The gain adjustment circuit multiplies the carrier signal by the complex gain value, and outputs the result of the multiplication. The subtraction circuit is coupled to the gain adjustment circuit. The subtraction circuit subtracts the output of the gain adjustment circuit from the received signal, and then provides the result of the subtraction as the output signal of the echo cancellation circuit.

Abstract: A lamp structure for adjusting light to be a high beam and a low beam has a sliding seat which comprises one end installed a lamp component and another end installed an annulate guiding groove on outer surface thereof, and the guiding groove comprises a first groove segment and a second groove segment, and the two groove segments have the same curvature; a lamp seat which comprises a first space for the sliding seat restricting in the first space, and a first through hole which is bored through the lamp seat into the first space and is according to the guiding groove of the sliding seat; and a restricting component comprises one end inserted in the first through hole of the lamp seat to trace the guiding groove for restricting the moving of the sliding seat.

Abstract: An illuminating device for dental handpieces is disclosed. The illumination device comprises a positioning shell, an illuminating component, a cable, a connector and a power supply. The positioning shell may be manufactured by using the plastic injection molding process, and has a shape suitable to accommodate different types of handpieces. The positioning shell comprises a groove on a top side thereof for holding the illuminating component. The illuminating component is electrically coupled to an external power supply. The illuminating device of the present invention may be used for providing the illuminating light during the operations. Thus, the disadvantages of replacing the entire handpieces when the illumination device malfunctions may be effectively eliminated. Thus, not only the cost can be reduced but also the brightness of the illumination can be increased providing convenience during the operations.

Abstract: A printed circuit unit implementing with organic transistors is provided. The printed circuit unit includes an input signal circuit, a load circuit and a level shifter. The input signal circuit includes N serially connected organic transistors. When one of the serially connected organic transistors is cut-off, the signal input circuit is cut-off, so that the circuit is maintained to output a correct voltage level. The level shifter circuit includes an organic transistor having a gate for receiving the input signal. The organic transistor can also serve as a load for improving a gain of the level shifter.

Abstract: An echo cancellation circuit for an RFID reader and the method thereof are provided. The echo cancellation circuit includes a gain calculator, a gain adjustment circuit, and a subtraction circuit. The gain calculator provides a complex gain value according to a carrier signal and a received signal through an adaptive algorithm. The gain adjustment circuit is coupled to the gain calculator. The gain adjustment circuit multiplies the carrier signal by the complex gain value, and outputs the result of the multiplication. The subtraction circuit is coupled to the gain adjustment circuit. The subtraction circuit subtracts the output of the gain adjustment circuit from the received signal, and then provides the result of the subtraction as the output signal of the echo cancellation circuit.

Abstract: A printed circuit unit implementing with organic transistors is provided. The printed circuit unit includes an input signal circuit, a load circuit and a level shifter. The input signal circuit includes N serially connected organic transistors. When one of the serially connected organic transistors is cut-off, the signal input circuit is cut-off, so that the circuit is maintained to output a correct voltage level. The level shifter circuit includes an organic transistor having a gate for receiving the input signal. The organic transistor can also serve as a load for improving a gain of the level shifter.

Abstract: A lamp structure for adjusting light to be a high beam and a low beam has a sliding seat which comprises one end installed a lamp component and another end installed an annulate guiding groove on outer surface thereof, and the guiding groove comprises a first groove segment and a second groove segment, and the two groove segments have the same curvature; a lamp seat which comprises a first space for the sliding seat restricting in the first space, and a first through hole which is bored through the lamp seat into the first space and is according to the guiding groove of the sliding seat; and a restricting component comprises one end inserted in the first through hole of the lamp seat to trace the guiding groove for restricting the moving of the sliding seat. The first groove segment comprises a first position, a second position, and a third position, and the second groove segment comprises a forth position, a fifth position, and a sixth position.