Abstract: The present invention relates to a pharmaceutical composition, a pharmaceutical composition for animals, and a food composition, each composition comprising a Scutellaria baicalensis extract, a Liriope platyphylla extract, a Sophora flavescens extract, a Dictamnus root bark extract, and a Phellodendron amurense Ruprecht extract, and preparation methods therefor.

Abstract: Provided is a voltage-controlled oscillator (VCO) using an LC resonator circuit which includes a first resonance circuit in which two serially connected varactor diodes and an inductor are connected in parallel, a second resonance circuit in which one or more inductor L1 and one or more capacitor C1 are connected in parallel, the second resonance circuit being serially connected to a port of the first resonance circuit, and a third resonance circuit in which one or more inductor L2 and one or more capacitor C2 are connected in parallel, the third resonance circuit being serially connected to the other port of the first resonance circuit.

Abstract: Provided is a voltage-controlled oscillator (VCO) using an LC resonator circuit which includes a first resonance circuit in which two serially connected varactor diodes and an inductor are connected in parallel, a second resonance circuit in which one or more inductor L1 and one or more capacitor C1 are connected in parallel, the second resonance circuit being serially connected to a port of the first resonance circuit, and a third resonance circuit in which one or more inductor L2 and one or more capacitor C2 are connected in parallel, the third resonance circuit being serially connected to the other port of the first resonance circuit.

Abstract: The present invention relates to a tuning circuit, more specifically to a tuning circuit for continuous-time filter capable of making exact the Gm value to minimize the variation of the cutoff frequency due to the variation of process in the Gm-C type of continuous-time filter.

Abstract: There is disclosed a low frequency filter. A low frequency cutoff filter includes a filter circuit having a capacitor connected between an input terminal and an output terminal and an active resistor connected to the output terminal, having a very large resistance, and a bias circuit having a negative feedback to set a biasing voltage of the active resistor to a desired value, thereby implementing the cutoff filter within a semiconductor chip as one set with the capacitor having a small capacitance. A low frequency pass filter includes an active resistor having a very large resistance, means for setting a biasing voltage of the active resistor to a desired value, and a capacitor connected between the output terminal and the ground. Therefore, the low pass filter can be integrated-circuited using even small capacitor.

Abstract: A double mode modulator, particularly, for a portable telephone, which is adapted to realize both digital and analog modulations and have a low phase noise and a reduced locking time with a device readily integrated in an integrated circuit, including: a frequency synthesizer for synthesizing a particular frequency from an external reference clock signal; a digital modulator for performing a quadrature modulation for an output signal of the frequency synthesizer; and an analog modulator for performing a frequency modulation for the output signal of the frequency synthesizer.

Abstract: The digital logic level conversion circuit is for converting a small sinusoidal signal or an unbalanced digital signal to a balanced digital signal with 50% duty ratio, and includes an input level shift circuit, two differential amplifiers, an RS flip-flop, a charge-pump circuit, and a bias circuit. The input level shift circuit for AC coupling a sinusoidal wave with a small amplitude (with a minimum of 0.4 Vpp) and converting it into a middle logic level. The two differential amplifiers is used as comparators having hysteresis each other, operates inversely, and outputs digital signals into the RS flip-flop; the bias circuit for controlling a driving current of the differential amplifiers; the RS flip-flop for driving the charge-pump circuit by outputting a digital signal upon receiving outputs from the differential amplifiers; and the charge-pump circuit for generating a reference potential level of the differential amplifiers.