Title :
Continuous-Time Bandpass Delta-Sigma Modulator for a Signal Frequency of 2.2 GHz
Author :
Schmidt, Martin ; Heck, Stefan ; Dettmann, Ingo ; Grözing, Markus ; Berroth, Manfred ; Wiegner, Dirk ; Templ, Wolfgang
Author_Institution :
Inst. of Electr. & Opt. Commun. Eng., Univ. Stuttgart, Stuttgart
Abstract :
A continuous-time bandpass delta-sigma modulator (CT BPDSM) for class-S power amplifier applications with a center frequency of 2.2 GHz is presented. Class-S amplifiers are considered to provide a very power efficient way to amplify signals with high dynamic range. The modulator has a multi-feedback architecture. It features a low noise transconductor with series emitter degeneration, tunable LC resonators with Q-enhancement and an optimized clock tree operating at 7.5 GHz. The circuit is implemented in a 200 GHz-fT SiGe-bipolar technology. A peak SNDR of 43 dB in a bandwidth of 20 MHz is measured. The circuit dissipates 450 mW from a 3.6 V supply.
Keywords :
band-pass filters; bipolar integrated circuits; continuous time filters; delta-sigma modulation; power amplifiers; bipolar integrated circuit; class-S power amplifier; continuous-time bandpass delta-sigma modulator; frequency 2.2 GHz; frequency 7.5 GHz; multifeedback architecture; power 450 mW; voltage 3.6 V; Bandwidth; Circuit noise; Clocks; Delta modulation; Dynamic range; Frequency; High power amplifiers; Power amplifiers; Transconductors; Tunable circuits and devices; Delta-sigma modulator; bipolar integrated circuit; class-S power amplifier;
Conference_Titel :
Microwave Conference, 2009 German
Conference_Location :
Munich
Print_ISBN :
978-3-9812668-0-1
Electronic_ISBN :
978-3-8007-3150-3
DOI :
10.1109/GEMIC.2009.4815872
