A 23dBm fully digital transmitter using ΣΔ and pulse-width modulation for LTE and WLAN applications in 45nm CMOS
作者： Rahmi Hezar , Lei Ding , Joonhoi Hur , Baher Haroun
DOI: 10.1109/RFIC.2014.6851702
关键词:
摘要: This paper presents a 23 dBm fully digital transmitter designed in standard 45 nm CMOS process. The replaces the entire analog/RF signal chain traditional architecture. It utilizes ΣΔ modulation and pulse-width to turn high resolution baseband I Q signals into switching signals, thereby allowing efficient Class-D PA stages be used. In addition, cascaded switched-capacitor combining are incorporated architecture reduced out-of-band quantization noise while maintaining good efficiency. proposed achieves peak output power of with 47% added efficiency (PAE). For OFDM 8.2 dB peak-to-average ratio (PAR), PAE is 23%. linearity meets WiFi spectral mask without any predistortion.
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