A current-folded up-conversion mixer and VCO with center-tappedinductor in a SiGe-HBT technology for 5-GHz wireless LAN applications

摘要

This paper describes a 5.8-GHz up-conversion mixer core based on ancurrent-folded architecture and a 5-GHz differential emitter-couplednvoltage-controlled oscillator (VCO) utilizing a center-tapped inductornand a substrate shield. Both circuits are fabricated in a 0.8-Μmn45-GHz fT SiGe heterojunction bipolar transistor (HBT)ntechnology. The supply voltage range is between -2.3 V and -3.3 V tonmeet the requirements of mobile circuits. Special care has been takennwith the inductor model. A distributed modeling approach was used tongenerate an inductor model from a geometrical description. This type ofnmodel also has the advantage that it can simulate RF effects in bothntime and frequency domain