7.6.3 CMOS Differential Pair

Chapter 7.6.3 CMOS Differential Pair

Radio Frequency Integrated Circuit Design Second Edition Book
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Radio Frequency Integrated Circuit Design Second Edition Book

  • 218 LNA Design7.6.3  CMOS Differential PairThe transfer characteristics of a CMOS differential pair, shown in Figure 7.36, can also be determined using the simple square law model for the transistor.Given that 1GS1GS2vvv=- (7.122)We can solve for v1 as function and of iD1 and iD2 using the square law relationship ox2()2DGSTCWivVLµæö=-ç÷èø (7.123)and noting that 12DDoiiI+= (7.124)The solution for v1 can be found as ()112ox2DDLviiCWµæö=-ç÷èø (7.125)or for iD1 as a function of v1: o1ox21oox1oo1ox21o()1224()1224DmIvWCWiI CvLILIg vCWvILµµµæöæöæö=+-ç÷ç÷ç÷èøèøèøæö=+-ç÷èø (7.126)where oxoomWgCIKILµ== (7.127)Figure 7.36  CMOS differential pair.