A 5-Gb/s 2.1-2.2-GHz Bandpass Delta Sigma Modulator for Switch-Mode Power Amplifier

作者：Ostrovskyy Philip^*; Gustat Hans; Ortmanns Maurits; Scheytt J Christoph

来源：IEEE Transactions on Microwave Theory and Techniques, 2012, 60(8): 2524-2531.

DOI：10.1109/TMTT.2012.2203143

• Analog-to-digital converters
• RF and mixed-signal ingrated-circuit (IC) design
• SiGe BiCMOS
• switching power amplifiers (PAs)
• WCDMA

A 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.

• 出版日期2012-8