Abstract: A balanced up-conversion mixer includes: a load circuit permitting a differential radio frequency (DRF) current signal pair (SP) to flow out and outputting a DRF voltage SP based on its impedance, a DC bias voltage and the DRF current SP; a mixing circuit allowing the DRF current SP to flow thereinto based on a differential intermediate frequency voltage SP, a differential oscillating voltage SP generated based on an oscillating voltage signal by a single-ended to differential conversion circuit, and first and second currents generated by a negative resistance compensation circuit based on a DC bias voltage; and a signal amplifier circuit amplifying the DRF voltage SP to generate a differential output voltage SP.

Abstract: A low noise amplifier includes a T-type circuit, a first amplification module and a second amplification module. The T-type circuit is adapted to receive an input signal from a signal source, filters the input signal to generate a filtered signal, and is configured such that an equivalent input impedance seen into the T-type circuit matches an equivalent output impedance seen into the signal source. The first amplification module is coupled to the T-type circuit for receiving the filtered signal therefrom, and amplifies the filtered signal to generate an amplified signal. The second amplification module is coupled to the first amplification module for receiving the amplified signal therefrom, and amplifies the amplified signal to generate an output signal.

Abstract: A power amplifier includes a plurality of power amplification modules, each of which includes an input terminal and an output terminal. Equivalent input impedances seen respectively into the power amplification modules from the input terminals thereof are the same, and equivalent output impedances seen respectively into the power amplification modules from the output terminals thereof are the same. The input terminals of the power amplification modules are coupled together for receiving an input signal. The output terminals of the power amplification modules are coupled together for outputting an output signal. Each of the power amplification modules amplifies a portion of a power of the input signal to obtain a portion of a power of the output signal.

Abstract: A low noise amplifier includes a T-type circuit, a first amplification module and a second amplification module. The T-type circuit is adapted to receive an input signal from a signal source, filters the input signal to generate a filtered signal, and is configured such that an equivalent input impedance seen into the T-type circuit matches an equivalent output impedance seen into the signal source. The first amplification module is coupled to the T-type circuit for receiving the filtered signal therefrom, and amplifies the filtered signal to generate an amplified signal. The second amplification module is coupled to the first amplification module for receiving the amplified signal therefrom, and amplifies the amplified signal to generate an output signal.

Abstract: A power amplifier includes a plurality of power amplification modules, each of which includes an input terminal and an output terminal. Equivalent input impedances seen respectively into the power amplification modules from the input terminals thereof are the same, and equivalent output impedances seen respectively into the power amplification modules from the output terminals thereof are the same. The input terminals of the power amplification modules are coupled together for receiving an input signal. The output terminals of the power amplification modules are coupled together for outputting an output signal. Each of the power amplification modules amplifies a portion of a power of the input signal to obtain a portion of a power of the output signal.

Abstract: A method and a system for voice communication, especially for a user who has voice or speaking problems, are disclosed. The method requires a communication sheet and a digital voice signal processing device. The communication sheet comprises a plurality of communication units and a plurality of function units for a user to click with the digital voice signal processing device. The plurality of function units comprise a whole sentence unit, and the method comprises a method for performing a function of emitting the sound of a whole sentence, which comprises the following steps: receiving sounds of words selected by the user; searching a voice file according to each of the sounds of words; receiving a command generated by the user's clicking the whole sentence unit; and playing voice files in order.

Abstract: A method of reducing the amount of black in an image is disclosed. The method is using a computer to reduce the amount of or eliminate the black in an original digital image. The major procedure is to increase the pixels of the original digital image (by four or nine times) and then change the color information of the pixels.

Abstract: A method of reducing the amount of black in an image is disclosed. The method is using a computer to reduce the amount of or eliminate the black in an original digital image. The major procedure is to increase the pixels of the original digital image (by four or nine times) and then change the color information of the pixels.

Abstract: A method and a system for voice communication, especially for a user who has voice or speaking problems, are disclosed. The method requires a communication sheet and a digital voice signal processing device. The communication sheet comprises a plurality of communication units and a plurality of function units for a user to click with the digital voice signal processing device. The plurality of function units comprise a whole sentence unit, and the method comprises a method for performing a function of emitting the sound of a whole sentence, which comprises the following steps: receiving sounds of words selected by the user; searching a voice file according to each of the sounds of words; receiving a command generated by the user's clicking the whole sentence unit; and playing voice files in order.