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Browsing by Author "Wong, Shyh-Chyi"

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    5-6 GHz 9.4 mW CMOS Direct-Conversion Passive-Mixer Receiver With Low-Flicker-Noise Corner
    (2012-01-01)
    Hsiao, Yu-Chih
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    Meng, Chinchun
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    Syu, Jin-Siang
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    Lin, Chung-Yo
    ;
    Wong, Shyh-Chyi
    This paper demonstrates a low-power and low-flicker-noise direct-conversion receiver using double-balanced passive mixer. The deep-n-well vertical-NPN bipolar junction transistor is placed as at the input stage of the IF amplifier to reduce the flicker noise in the 0.18 um standard CMOS process. As a result, conversion gain achieves 50-dB gain when the LO power is 10 dBm and the noise figure is 7-dB at 100 kHz. The totally power consumption is 9.4 mW at 1.8 V voltage supply.
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    Temperature Insensitive PA Bias Circuit With Digital Control Interface Using InGaP/GaAs HBT Technology
    (2015-01-01)
    Chang, Wei-Ling
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    Meng, Chinchun
    ;
    Wong, Shyh-Chyi
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    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.