A Differential VCO Design for GSM Handset Applications

A Differential VCO Design for GSM Handset Applications SG3qNM: g  
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Introduction .w~zW*M0  
The differential pair of bipolar transistors is the common mvBUm-X  
building block in modern RF integrated circuits.An +|Qe/
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advantage of this architecture is its high loop gain making "cX*GTNi8  
it popular for differential Voltage Controlled Oscillator >c@1UEwkm  
(VCO) designs in RFICs.Designers of discrete (or hybrid) 0Yc
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VCO circuits usually use the more traditional Colpitts b
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design avoiding the added complexity of the differential xW'(]Z7_  
VCO configuration. $g)X,iQu  
Because of its primary usage in proprietary RFICs, only B ? D|B  
limited differential VCO design and modeling information Fy]j33E  
has been made available.In this application note, we will [3hOc/]s  
attempt to build a bridge toward better understanding of _qhYG1t  
the differential VCO by describing a design covering RkBbu4uQ-  
910–980 MHz which is appropriate for use in GSM T8J[B( )L  
handsets.This design will also demonstrate how the Alpha 1)h+xY  
SMV1493-079 varactor diode, an essential element in this J+8T Ie  
VCO, .. lmr:PX  
^1+&)6s7V  

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ding好贴就顶么

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正接手一个720M的  没做过 先学下

很不错，再次感谢

很不错，再次感谢