Samsung Electro-mechanics Co., Ltd.

Kyu Jin Choi

Jae Hyouck Choi

Jeong Hoon Kim

Suk Chan Kang

Je Hee Cho

Kwang Du Lee

Joong Jin Nam

Kyung Pyo Hong

Ho Kwon Yoon

Byeong Hak Jo

Jong Ok Ha

Kyung Hee Hong

A bias circuit includes a current generating circuit generating an internal base current based on a reference current, a bias output circuit generating a base bias current based on the internal base current and outputting the base bias current to an amplifying circuit, and a temperature compensation circuit regulating the base bias current based on a temperature voltage reflecting a change in ambient temperature.

Bias circuit and amplifying device with temperature compensation

An amplifying device includes a current generating circuit, a bias amplifying circuit, and a compensation circuit. The current generating circuit is configured to generate an internal current based on an internal voltage. The bias amplifying circuit, connected to the current generating circuit, is configured to output a bias current generated by amplifying the internal current to a power amplifying circuit. The compensation circuit, connected to the current generating circuit, is configured to adjust the internal voltage based on a bias voltage of the power amplifying circuit.

Amplifying device with adaptive CTAT biasing control

A bias circuit includes a current generating circuit generating a first compensation current and a second compensation current, in which an ambient temperature change is reflected, based on a reference current, a first temperature compensation circuit generating a first base bias current, based on the first compensation current, to output the first base bias current to a base node of an amplifying circuit, and a second temperature compensation circuit generating a second base bias current, based on the second compensation current, to output the second base bias current to the base node of the amplifying circuit.

Bias circuit and amplifying device with dual compensation

A power amplifying apparatus includes a first bias circuit configured to generate a first bias current by adding a boost current to a base bias current generated from a reference current, a first amplification circuit configured to receive the first bias current and amplify a signal input through an input terminal of the first amplification unit to output a first amplified signal, and a bias boosting circuit configured to generate the boost current, based on a magnitude of a harmonic component in the amplified signal output from the first amplification circuit.

Power amplifying apparatus having bias boosting structure with improved linearity

A multistage power amplifier includes a first amplification circuit disposed in a front stage of the multistage power amplifier, a first bias circuit configured to output a first bias current, a bias path circuit, an envelope detection circuit, and an alternating current (AC) path circuit. The envelope detection circuit is configured to output a direct current (DC) detection voltage based on an envelope signal of a radio frequency (RF) signal input to the first amplification circuit. The AC path circuit is configured to branch an AC signal from an input terminal of the first amplification circuit and transfer the AC signal to the first bias circuit, upon the first amplification circuit operating in a high power driving region based on the DC detection voltage. The first bias circuit is configured to compensate for the first bias current based on the AC signal transferred through the AC path circuit.

Multistage power amplifier with bias compensating function

A multistage power amplifier comprises a first amplification circuit which receives a first bias current; a second amplification circuit which receives a second bias current; an envelope detection circuit which outputs a direct current (DC) detection voltage based on an envelope of an input radio frequency (RF) signal; and a bias compensation circuit which compensates for the first bias current based on the second bias current in response to the DC detection voltage.

Multistage power amplifier with linearity compensating function

There is provided a power amplifier and an integrated circuit including the power amplifier. The power amplifier includes a first amplifier configured to amplify a first signal; a phase shifter configured to invert the first signal; and a harmonic sinker connected between an output terminal of the phase shifter and an output terminal of the first amplifier, configured to amplify an output signal of the phase shifter, and configured to have a conduction angle narrower than a conduction angle of the first amplifier.

Power amplifier apparatus and method

A power amplifying apparatus includes a first bias circuit that generates a first bias current having a first magnitude, a first amplification circuit connected between a first node and a second node, and that receives the first bias current, amplifies a signal input through the first node, and outputs a first amplified signal to the second node, a second bias circuit that generates a second bias current having a second magnitude that is different from the first magnitude of the first bias current, and a second amplification circuit connected in parallel with the first amplification circuit between the first node and the second node, and that receives the second bias current, amplifies the signal input through the first node, and outputs a second amplified signal to the second node, wherein the second amplification circuit may have a size that is different from a size of the first amplification circuit.

Power amplifying apparatus with asymmetrical amplification structure and linearity

A power amplifying apparatus includes a first bias circuit configured to generate a first bias current, a first amplification circuit, configured to receive the first bias current, amplify a signal input to the first amplification circuit through a first node, and output a first amplified signal to a second node, a second bias circuit, configured to generate a second bias current which has a magnitude different from a magnitude of the first bias current, and a second amplification circuit, connected in parallel with the first amplification, configured to receive the second bias current, amplify the signal input through the first node, and output a second amplified signal to the second node. The second amplification circuit is configured to output the second amplified signal with a third-harmonic component that has a phase offsetting a third-order intermodulation distortion (IM3) component included in the first amplified signal, based on the second bias current.

Power amplifying apparatus with wideband linearity

A power amplifying device includes a first amplification circuit amplifying a first signal having a first frequency component and a second frequency component; a second amplification circuit amplifying a second signal received through an output node of the first amplification circuit; a filter circuit connected between a ground node of the first amplification circuit and a common ground to pass the first and second frequency components to the common ground through the ground node; and an inverting circuit that phase-inverts a signal including second harmonic components of the first and second frequency components that are received through the ground node of the first amplification circuit and provide the phase inverted signal to the output node of the first amplification circuit.

Power amplifying device

A tunable inductor circuit includes a first common transmission line having one end connected to a first terminal; a first uncommon transmission line having one end connected to another end of the first common transmission line; a first switch circuit configured to selectively connect one of the other end of the first common transmission line and another end of the first uncommon transmission line to a first common node; a second common transmission line having one end connected to the first common node; a second uncommon transmission line having one end connected to another end of the second common transmission line; and a second switch circuit configured to selectively connect one of the other end of the second common transmission line and another end of the second uncommon transmission line to a second terminal.

Tunable inductor circuit

A reference current generating circuit includes a current source circuit configured to generate a reference current based on an internal resistor; and a compensation circuit configured to comprise a first compensation circuit comprising a first compensation resistor and a second compensation resistor, and the first compensation resistor and the second compensation resistor are configured to convert the reference current into a first output current and compensate for process variation of the current source circuit.

Reference current generating circuit with process variation compensation

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

An radio frequency switch according to an example includes a first switching circuit including first switching elements connected in series between an antenna port and a transmission port and operated by a first gate signal, a second switching circuit including second switching elements connected in series between the antenna port and a reception port and operated by a second gate signal, a first shunt circuit connected between the transmission port and a ground and operated by the second gate signal, a second shunt circuit connected between the reception port and the ground and operated by the first gate signal, and a third shunt circuit connected between the reception port and the other end of an inductor grounded at one end and operated by the second gate signal.

Radio frequency switch

A power amplifier may include a first amplifying unit receiving a first bias signal to amplify a power level of an input signal; an envelope detecting unit detecting an envelope of the input signal; a comparing circuit unit comparing a peak value of the detected envelope with a preset reference voltage; and a second amplifying unit amplifying the power level of the input signal according to a second bias signal set depending on a comparison result of the comparing circuit unit.

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Suwon-si, South Korea

Kyu Jin Choi