A 5-Gb/s 2.1–2.2-GHz Bandpass $\Delta \Sigma$ Modulator for Switch-Mode Power Amplifier
2012; IEEE Microwave Theory and Techniques Society; Volume: 60; Issue: 8 Linguagem: Inglês
10.1109/tmtt.2012.2203143
ISSN1557-9670
AutoresP. Ostrovskyy, H. Gustat, Maurits Ortmanns, J. Christoph Scheytt,
Tópico(s)Microwave Engineering and Waveguides
ResumoA tunable fourth-order bandpass $\Delta \Sigma$ modulator (BDSM) designed and fabricated in 0.25- $\mu$ m SiGe BiCMOS technology is presented. The designed modulator relaxes switching conditions for the amplification stage of the switch-mode power amplifier in comparison to the ${ f}_{ S}/4$ BDSM architecture. The BDSM is clocked at 5 GHz, while the notch frequency can be tuned in a range of 2.1–2.2 GHz. The modulator achieves 46.6-dB signal-to-noise and distortion ratio in 10-MHz bandwidth for a sine-wave input at 2.2 GHz consuming 330 mW from a ${-}$ 3-V supply. The BDSM was also tested with a single-channel WCDMA signal. It has demonstrated 42.2-dBc adjacent channel leakage ratio at 5-MHz offset and less than 2.1% error vector magnitude over the tuning range.
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