differernt vco design for gsm

differernt vco design for gsm @A/k"Ax{r  
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Introduction "/W[gP[y%  
The differential pair of bipolar transistors is the common }Z!D?(  
building block in modern RF integrated circuits.An +
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advantage of this architecture is its high loop gain making R@vcS=m7  
it popular for differential Voltage Controlled Oscillator UiFH*HT  
(VCO) designs in RFICs.Designers of discrete (or hybrid) G=zWhqieh  
VCO circuits usually use the more traditional Colpitts =CX1jrLZ  
design avoiding the added complexity of the differential u^80NR  
VCO configuration. YDt+1Kw}D  
Because of its primary usage in proprietary RFICs, only m~=~DMj  
limited differential VCO design and modeling information zsFzg.$3&  
has been made available.In this application note, we will 5(1:^:LGK  
attempt to build a bridge toward better understanding of Zi!Ta"}8  
the differential VCO by describing a design covering OmYVJt_  
910–980 MHz which is appropriate for use in GSM o5 L^  
handsets.This design will also demonstrate how the wKV4-uyr  
SMV1493-079 varactor diode, an essential element in this 7u):J  
VCO, may .. "W|A^@r}  
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