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Browsing by Author "Chien, Hwey"

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    Temperature Insensitive PA Bias Circuit With Digital Control Interface Using InGaP/GaAs HBT Technology
    (2015-01-01)
    Chang, Wei-Ling
    ;
    Meng, Chinchun
    ;
    Wong, Shyh-Chyi
    ;
    Chien, Hwey
    ;
    Huang, Guo-Wei
    This paper demonstrates a new temperature insensitive bias circuit using a Wilson current mirror for the InGaP/GaAs HBT power amplifier. The Wilson current mirror has a high impedance node for connecting an on/off digital interface and a stable voltage node for injection of feedback signals to achieve a temperature insensitive bias. The fabricated output stage of the power amplifier with the feedback through the Wilson current source shows a stable bias current with current variation from 186 mA to 182 mA for the temperature range from 25 degrees C to 200 degrees C. A bias circuit without the feedback through the Wilson current source is also fabricated for comparison and shows a strong bias current variation over temperature.
  • Thumbnail Image
    Item type:Item,
    Temperature Insensitive PA Bias Circuit With Digital Control Interface Using InGaP/GaAs HBT Technology
    (2015)
    Chang, Wei-Ling
    ;
    Meng, Chinchun
    ;
    Wong, Shyh-Chyi
    ;
    Chien, Hwey
    ;
    Huang, Guo-Wei
    This paper demonstrates a new temperature insensitive bias circuit using a Wilson current mirror for the InGaP/GaAs HBT power amplifier. The Wilson current mirror has a high impedance node for connecting an on/off digital interface and a stable voltage node for injection of feedback signals to achieve a temperature insensitive bias. The fabricated output stage of the power amplifier with the feedback through the Wilson current source shows a stable bias current with current variation from 186 mA to 182 mA for the temperature range from 25 degrees C to 200 degrees C. A bias circuit without the feedback through the Wilson current source is also fabricated for comparison and shows a strong bias current variation over temperature.