Samsung Electro-mechanics Co., Ltd.

Kyung Hee Hong

Yong Il Kwon

Tah Joon Park

Joon Hyung Lim

Sang Hoon Hwang

Myeung Su Kim

Kwang Du Lee

Jae Hyouck Choi

Han Jin Cho

Suk Chan Kang

Jeong Hoon Kim

Shinichi Iizuka

Jong Ok Ha

Ho Kwon Yoon

Joong Jin Nam

Kyu Jin Choi

A power amplifier may include a first amplifying circuit configured to amplify an input RF signal; a second amplifying circuit connected to the first amplifying circuit in parallel configured to amplify the input RF signal; and a controller connected to at least one of the first amplifying circuit and the second amplifying circuit and configured to output a control signal in order to control an on-off state of at least one of the first amplifying circuit and the second amplifying circuit. Such an approach provides high efficiency without adding significant complexity to the power amplifier.

Power amplifier and method of controlling output of power amplifier

A power amplifier apparatus includes: an amplifier configured to amplify an input signal; a sensing circuit connected to the amplifier and configured to sense a bias of the amplifier; and a biasing circuit connected to the sensing circuit and configured to provide a biasing current to the amplifier, wherein the sensing circuit is configured to change the biasing current based on the bias of the amplifier.

Power amplifier and method for limiting current in power amplifier

Disclosed herein is a delay circuit for a low power ring oscillator. The delay circuit includes: a pair of N type transistors that receive first differential input signals Vin+ and Vin&#x2212;; a pair of P type transistors that receive second differential input signals Vin+ and Vin&#x2212;; a differential output terminal that outputs differential output signals Vout+ and Vout&#x2212; generated from the pair of N type transistors and the pair of P type transistors; an N type detector that supplies a body voltage to the pair of N type transistors; and a P type detector that supplies a body voltage to the pair of P type transistors.

Delay circuit for low power ring oscillator

Disclosed is a wireless communication apparatus having a self sensing function, which can detect an object by use of a wake-up function without employing a separate sensor. The wireless communication apparatus includes a communication unit wirelessly communicating with a server forming a wireless network, and a wake-up unit waking up the communication unit under the control of the server when the communication unit is in sleep mode, and sensing the presence of an object within a preset communication range according to a reflection signal, which is a signal reflected by the object after being transmitted from the communication unit.

Wireless communication apparatus having self sensing function

In a key scanning circuit, a key input unit has a parallel connection of a plurality of circuits having a series connection of resistors and switches between a power supply input terminal and a key scanning terminal. The resistors connected in parallel have different resistances. A current mirror has a first terminal connected to the key scanning terminal. A reference current source is connected between a second terminal of the current mirror and the power supply input terminal.

Key scanning circuit

The present invention relates to a broadband voltage controlled oscillator and a method for generating a broadband oscillation frequency; and, more particularly, to a broadband voltage controlled oscillator and a method for generating a broadband oscillation frequency capable of operating over a wide frequency band by including a weighted current cell to select two frequency band modes, generating various levels of total 64 oscillation frequencies by including a variable frequency tank and a capacitor bank, and further facilitating adjustment of the total 64 oscillation frequencies distributed over the wide frequency band by including a control signal generator for generating control signals each of which is applied to the weighted current cell, the variable frequency tank and the capacitor bank by a BDD (Binary Decision Diagram) technique.

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Seoul, South Korea

Kyung Hee Hong