Title :
A current-folded up-conversion mixer and VCO with center-tapped inductor in a SiGe-HBT technology for 5-GHz wireless LAN applications
Author :
Grau, Günter ; Langmann, Ulrich ; Winkler, Wolfgang ; Knoll, Dieter ; Osten, Jörg ; Pressel, Klaus
Author_Institution :
Lehrstuhl fur Elektronische Bauelemente, Ruhr-Univ., Bochum, Germany
Abstract :
This paper describes a 5.8-GHz up-conversion mixer core based on a current-folded architecture and a 5-GHz differential emitter-coupled voltage-controlled oscillator (VCO) utilizing a center-tapped inductor and a substrate shield. Both circuits are fabricated in a 0.8-/spl mu/m 45-GHz f/sub T/ SiGe heterojunction bipolar transistor (HBT) technology. The supply voltage range is between -2.3 V and -3.3 V to meet the requirements of mobile circuits. Special care has been taken with the inductor model. A distributed modeling approach was used to generate an inductor model from a geometrical description. This type of model also has the advantage that it can simulate RF effects in both time and frequency domain.
Keywords :
Ge-Si alloys; MMIC mixers; MMIC oscillators; bipolar MMIC; equivalent circuits; heterojunction bipolar transistors; inductors; integrated circuit design; integrated circuit modeling; semiconductor materials; voltage-controlled oscillators; wireless LAN; -2.3 to -3.3 V; 0.8 micron; 5 GHz; 5.8 GHz; SHF; SiGe; SiGe HBT technology; center-tapped inductor; current-folded architecture; differential emitter-coupled VCO; distributed modeling approach; geometrical description; heterojunction bipolar transistor technology; inductor model; mobile circuits; substrate shield; up-conversion mixer; voltage-controlled oscillator; wireless LAN applications; Circuit simulation; Distributed control; Germanium silicon alloys; Heterojunction bipolar transistors; Inductors; Radio frequency; Silicon germanium; Solid modeling; Voltage; Voltage-controlled oscillators;
Journal_Title :
Solid-State Circuits, IEEE Journal of
