Samsung Electronics Co., Ltd.

Jong-Dae Bae

Jae-Wan Kim

Hyun-Won Mun

Il-Ku Nam

Jung-wook Heo

Byeong-Ha Park

Ho-Jung Ju

Jeong-Hyun Choi

A programmable variable gain amplifier includes at least three amplifiers. A first amplifier is configured to amplify an input signal. A second amplifier, which includes a programmable output load stage, is configured to receive an output signal from the first amplifier and to output a first differential output signal. The output load stage includes multiple first switches and multiple first diode-connected transistors that are open-circuited or short-circuited by the first switches. A third amplifier, which includes a programmable current mirror input stage, is configured to receive the first differential output signal from the second amplifier through the current mirror input stage and to output a second differential output signal. The current mirror input stage includes multiple second switches and multiple second transistors that are open-circuited or short-circuited by the plurality of second switches. The second transistors respectively form current mirrors with the first diode-connected transistors corresponding to the second transistors.

Programmable variable gain amplifier and RF receiver including the same

An RF transmitter includes a modulating circuit adapted to modulating an RF signal, an output amplifier adapted to amplify the modulated RF signal; an auto tuner generating a tuning voltage that varies in accordance with operating temperature fluctuations and/or manufacturing process variances, and a reference current generating circuit adapted to generate a reference current in response to the tuning voltage.

RF transmitter for efficiently compensating output power variation due to temperature and process

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Suwon-si, South Korea

Jong-Dae Bae