Abstract:
PURPOSE: A successive approximation analog/digital converter and a time-interleaved successive approximation analog/digital converter are provided to working speed thereof by reducing an operation clock in one cycle. CONSTITUTION: A sample and hold part(11) samples the size of an analog input signal by using one cycle of a clock signal. A first comparison unit(12) compares the size and comparative object voltage of the analog input signal every one cycle of clock. A second comparison unit(15) compares the size of the sampled input signal with half of the preset reference voltage. A successive approximation register block(13) determines the value of the most significant bit of the transformed digital value according to the comparison result of the second comparison unit. A digital to analog converter(14) generates comparative object voltage.
Abstract:
PURPOSE: A converter and a wireless telecommunications system using the same are provided to possessively process a signal for various frequency signals of inputs by controlling a sampling frequency offered to a sigma-delta modulator according to an analog input signal. CONSTITUTION: A converter(200) includes a band pass, a sigma-delta modulator(210) and a detector(220). The sigma-delta modulator outputs a digital frequency signal by sigma-delta-modulating an analog signal using a received set sampling frequency. The detector senses a band of the analog signal. The detector supplies the sampling frequency to the sigma-delta modulator according to the detected signal. The detector includes a frequency-voltage converter(221) for changing the frequency of the analog signal into the voltage, an analog-digital converter(222) for changing the voltage into the digital signal and a clock control part(223) for adjusting the sampling frequency.
Abstract:
The present invention relates to a multiple output crystal oscillator having a plurality of output terminals for implementing multiple output and Integrated Circuit (IC) chips. More particularly, the crystal oscillator comprises a crystal resonator, a first IC chip having an oscillating circuit block and a frequency-adjusting circuit block, a second IC chip having an output-adjusting block, and a substrate structure for mounting said first and second IC chips, wherein said output terminals include a basic output terminal for outputting the oscillating signal from said first IC chip and at least one additional output terminal for outputting at least one wave form-adjusted oscillation signal from said second IC chip. In the present invention, said basic output terminal is placed on one of four underside corners of said substrate, and said additional output terminal is placed on the portion of the underside except the corners.
Abstract:
PURPOSE: A temperature compensated crystal oscillator is provided to reduce the height of the products by providing a structure formed by opening a pair of cavities up and down to mount the crystal oscillator and an integrated circuit(IC) chip and not overlapping the two cavity in a vertical direction so as to omit the substrate to divide the crystal oscillator and the IC chip. CONSTITUTION: A temperature compensated crystal oscillator includes a first substrate structure(41) made of at least one substrate and formed thereon a cavity, a second substrate structure(42), made of at least one substrate, placed on the top of the first substrate structure and not overlapped with the cavity of the first substrate structure(41), an integrated circuit(IC) chip(47) mounted on the cavity of the first substrate structure(41), a crystal oscillator(43) mounted on the cavity of the second substrate structure(42), a molding part(49) having a plane below the first substrate structure(41) by filling the cavity with a resin and a metal cover(45) for covering the cavity formed on the first substrate structure(41).
Abstract:
본 발명은 전원 공급부; 상기 전원 공급부로부터 전원을 공급받고, 송신 신호에 기초한 포락선 정보를 획득하고, 상기 포락선 정보에 근거하여 포락선 전원을 획득하는 포락선 트랙킹 모듈; 상기 전원 공급부 및 상기 포락선 트랙킹 모듈 중 어느 하나로부터 전원을 공급받고, 송신 신호를 증폭하는 송신 신호 증폭기; 및 상기 포락선 트랙킹 모듈의 비안정화 구간인 제1 구간에는 상기 전원 공급부와 상기 송신 신호 증폭기를 연결하고, 상기 포락선 트랙킹 모듈의 안정화 구간인 제2 구간에는 상기 포락선 트랙킹 모듈과 상기 송신 신호 증폭기를 연결하는 스위칭부;를 포함하는 포락선 트랙킹 전원 장치에 관한 것이다.
Abstract:
The present invention relates to a variable capacitance circuit. According to the present invention, disclosed is a variable capacitance circuit which comprises multiple capacitance circuit parts including at least one switched capacitor unit connected in parallel respectively between a first terminal and a second terminal where a signal is inputted and outputted to provide capacitance; and a switch module having multiple switches stacked between the second terminal and a first ground terminal, wherein the switched capacitor unit comprises a switch part switching a forming path of the capacitance; and a capacitor part providing the capacitance through the path formed according to the switching of the switch part.
Abstract:
The present invention relates to a variable capacitance control circuit and a variable capacitance control method by the variable capacitance control circuit including an MIM capacitor, multiple FET switches, and a control unit. The variable capacitance control method of the present invention obtains a desired variable capacitance value by outputting a control signal which turns on an FET among the multiple (n number) FET switches and turns off remaining (n-1) FET switches by the control unit to multiple FET switches. The present invention increases a Q value (Q=1/RC) by reducing an overall FET on-resistance value by using a control way which turns on an FET switch among the N number of FET switches and turns off remaining FET switches and thereby optimizes power consumption in a power amplifier (PA) and a reception rate in a low noise amplifier (LNA). [Reference numerals] (AA) (n-1) number
Abstract:
PURPOSE: A hybrid variable capacity, an RF device, a hybrid variable capacitor manufacturing method, and a variable capacitor adjustment method are provided to increase the tuning range and reduce the step size, thereby enhancing the resolution and enabling fine tuning. CONSTITUTION: A hybrid variable capacitor includes a metal insulator metal (MIM) cap array, an MOS varactor (30), and a FET switch (20). The MIM cap array includes MIM capacitors and has the varied capacitance corresponding to the value of a lower bit domain among digital values of the capacitance to be adjusted. The MOS varactor is connected to the MIM cap array in parallel and has the varied capacitance corresponding to the value of an upper bit domain among the digital values. The FET switch is connected to each capacitor of the MIM cap array and performs switching depending on the value of the lower bit domain to make the MIM cap array have the varied capacitance. [Reference numerals] (AA) Lower bit area; (BB) Upper bit area