A Differential VCO Design for GSM Handset Applications

A Differential VCO Design for GSM Handset Applications qche7kg!a  
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Introduction dRTpG
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The differential pair of bipolar transistors is the common VE/~tT;  
building block in modern RF integrated circuits.An *c@]c~hY,  
advantage of this architecture is its high loop gain making SHCVjI6  
it popular for differential Voltage Controlled Oscillator w2tkJcQ3  
(VCO) designs in RFICs.Designers of discrete (or hybrid) FRTvo  
VCO circuits usually use the more traditional Colpitts 
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design avoiding the added complexity of the differential gOk^("@  
VCO configuration. c:}K(yAdd  
Because of its primary usage in proprietary RFICs, only U3w*z6OG  
limited differential VCO design and modeling information UOIZ8Po  
has been made available.In this application note, we will BCHI@a  
attempt to build a bridge toward better understanding of q{.~=~  
the differential VCO by describing a design covering D7$xY\0r  
910–980 MHz which is appropriate for use in GSM >2)!w  
handsets.This design will also demonstrate how the Alpha y] ~X{v  
SMV1493-079 varactor diode, an essential element in this P+3)YO1C  
VCO, .. sQT,@'"  
S[uHPYhlA  

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很不错，再次感谢

很不错，再次感谢