Samsung Electro-mechanics Co., Ltd.

Moon Sun Kim

Yoo Sam Na

Hyeon Seok Hwang

Byeong Hak Jo

Won Jin Baek

Moon Suk Jeong

Gyu Suck Kim

Kyoung Seok Park

Byung Sung Kim

There is provided a complementary metal oxide semiconductor (CMOS) power amplifier including: a load unit connected between an operating voltage supply terminal and an output terminal; an amplifying unit formed as a cascode structure between the load unit and a ground, amplifying a power of an input signal input through an input terminal and outputting the amplified signal through an output terminal; and a threshold voltage control unit varying a threshold voltage of the amplifying unit according to a magnitude of the input signal input through the input terminal.

Power amplifier

Disclosed is a step variable gain amplifier for linearly amplifying a signal received from an antenna. The step variable gain amplifier includes: an amplification unit for converting and amplifying a voltage component of a received signal into a current voltage according to a step amplification control signal; a controller for generating a step amplification control signal of the received signal and controlling on/off of the amplification unit according to the control signal; and an output unit connected to the amplification unit, the output unit outputting a voltage component from the signal that has been subjected to conversion into the current component and amplification processes.

Step variable gain amplifier

There is provided an active balun circuit including: a load circuit unit including a first and a second load; a differential amplifying unit including a first amplifying unit connected to the first load, and a second amplifying unit connected to the second load and forming a differential amplifying unit together with the first amplifying unit, the differential amplifying unit differentially amplifying an input signal, and outputting first and second output signals out-of-phase with each other through first and second output terminals, respectively; a current source connected between a ground and a common connection node of the first and second amplifying units, and maintaining a constant amount of current flowing through the differential amplifying unit; and a compensation amplifying unit amplifying the input signal supplied through the input terminal, transmitting the amplified input signal to the second amplifying unit, and rejecting common mode noise of the differential amplifying unit.

Active balun circuit

A derivative superposition circuit for linearization includes a first active element that is provided with first to third terminals and in which the magnitude and direction of current flowing from the second terminal to the third terminal changes on the basis of the magnitude of a voltage applied between the first and second terminals; and a second active element that is provided with first to third terminals and has complementary characteristics with the first active element. The first terminals of the first and second active elements are connected to each other so that a predetermined operational bias voltage is maintained by first and second power supplies through a first impedance, and are connected to an input end through a second impedance. The third terminals of the first and second active elements are connected to an output end, and the second terminals of the first and second active elements are connected to the second power supply through a third impedance.

Derivative superposition circuit for linearization

There is provided a step attenuator having two Pi-type attenuators and one bridged-T type attenuator that share some resistors. The step attenuator is used to prevent a reduction in frequency range caused by use of MOS transistors and reduce attenuation of signal power and frequency band by the MOS transistors, thereby obtaining a low attenuation value and reducing input and output mismatch.

Step attenuator

The invention relates to a feedback or feedforward type variable gain wideband amplifier. The variable gain wideband amplifier includes a feedback-type inversion amplifier circuitfor amplifying input Vin, a feedback-type non-inversion amplifier circuitfor amplifying input Vin, a power source circuitfor controlling the gain of the non-inversion amplifier circuitand a load circuitconnected between a junction of output terminals of the inversion and non-inversion amplifier circuitsandand power voltage potential VDD to control the gain of the amplifier circuitsandThe variable gain wideband amplifier of the invention is feedforward type, and outputs signals from the inversion and non-inversion amplifier circuitsandvia a single output terminal in order to attenuate third order intermodulation frequency IMgenerated from the amplifier circuitsandThen, predetermined frequencies fand fincluded in the input signal are amplified.

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Gyunggi-do, South Korea

Moon Sun Kim