Title :
A 2.5GHz delay-based wideband OFDM outphasing modulator in 45nm-LP CMOS
Author :
Ravi, Ashoke ; Madoglio, Paolo ; Verhelst, Marian ; Sajadieh, Masoud ; Aguirre, Mariano ; Xu, Hongtao ; Pellerano, Stefano ; Lomeli, Ismael ; Zarate, Jorge ; Cuellar, Luis ; Degani, Ofir ; Lakdawala, Hasnain ; Soumyanath, Krishnamurthy ; Palaskas, Yorgos
Author_Institution :
Intel Labs., Intel Corp., Hillsboro, OR, USA
Abstract :
A 2.5 GHz delay-based CMOS outphasing transmitter for wideband OFDM is presented in 45nm LP CMOS. It dynamically delays LO edges to modulate the phase of two outphasing signals. A Tapped-Delay-Line coarse delay modulator allows delay modulation at the LO rate with no glitches. This is used to implement a 11-bit ΣΔ-dithered θ modulator with phase-domain filtering, and a 9-bit open-loop φ modulator. The system meets EVM and ACPR requirements for 802.11g at 2.5GHz.
Keywords :
CMOS digital integrated circuits; OFDM modulation; radio transmitters; sigma-delta modulation; ΣΔ-dithered θ modulator; 802.11g; LP CMOS; delay modulation; delay-based CMOS outphasing transmitter; frequency 2.5 GHz; open-loop φ modulator; phase-domain filtering; size 45 nm; tapped-delay-line coarse delay modulator; wideband OFDM; word length 11 bit; word length 9 bit; CMOS integrated circuits; OFDM; Phase modulation; Radio transmitters; Table lookup; Wideband;
Conference_Titel :
VLSI Circuits (VLSIC), 2011 Symposium on
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-61284-175-5
