教師著作

Permanent URI for this collectionhttp://rportal.lib.ntnu.edu.tw/handle/20.500.12235/31268

Browse

Author: search.filters.author.Shih-Yu Chen

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    A Q-band miniature monolithic subharmonically pumped resistive mixer
    (2006-12-01) Shih-Yu Chen; Jeng-Han Tsai; Pei-Si Wu; Tian-Wei Huang; Huei Wang
    This paper proposes a miniature Q-band monolithic subharmonically pumped resistivemixer, consisting of two pHEMT transistors, a LOreduced-size Marchand balun and RF/IF filters. Thecompact RF/IF diplex circuit and a reduced-sizebalun were used to minimize the chip size whichresults only 0.72 mm 2 . Besides, 5 dBm LO inputpower is needed which is one-third of othersubharmonically pumped mixers with more than 10dBm LO power. This mixer exhibits 12.5 � 1.5 dBup-conversion loss and 12 � 1 dB down-conversionloss with 5 dBm LO input power. Up-conversion 1-dB compression output power is -15dBm and down-conversion 1-dB compression output power is -12dBm. To our knowledge, this mixer has goodconversion with smallest chip size and minimum LOinput power.
  • No Thumbnail Available
    Item
    Minimum ACPR “sweet-spot” using statistical power distribution function
    (2006-12-15) Jeng-Han Tsai; Shih-Yu Chen; Wei-Chien Chen; Tian-Wei Huang
    During the linearity optimization, the ACPR improvement is quite different from the inter-modulation third-order distortion ratio (IM3R) improvement, but there exist some relation between ACPR and IM3R To correlate the IM3R and ACPR, we propose the statistical probability density function (PDF) method to predict the relation between the ACPR improvement and the IM3R improvement for weekly nonlinear amplifiers. There is a 10 dB difference between measured ACPR and IM3R near sweet spot region, however, through our modification process, only 2-3 dB difference between our theoretical prediction and measured ACPR exist. Two of the modulation signals, W-CDMA and QPSK, have been proved that the prediction of ACPR from two-tone IM3R can be much closed to the measured one as long as the modified PDF term is utilized.