Samsung Electro-mechanics Co., Ltd.

Je Hee Cho

Kyu Jin Choi

Jae Hyouck Choi

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 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.

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Suwon-si, South Korea

Je Hee Cho