Title :
A 90nm CMOS Doherty Power Amplifier with Integrated Hybrid Coupler and Impedance Transformer
Author :
Elmala, Mostafa ; Bishop, Ralph
Author_Institution :
Intel Corp., Hillsboro
Abstract :
An OFDM capable Doherty PA is implemented in 90 nm CMOS with integrated quadrature hybrid and impedance transformer. The two amplifiers are optimized to minimize AM-PM distortion. The PA achieves 25 dBm Psa, using 1.4 V supply with 24% PAE, and operates over 1 GHz of frequency range (from 4 GHz to 5 GHz). 3 dB to 6 dB back-off from P1dB is required to achieve -25 dB measured EVM across this band, making it suitable for WLAN and WiMAX applications. The measured AM-PM distortion varies from 4deg to 12.5deg across the 1 GHz range.
Keywords :
CMOS integrated circuits; WiMax; application specific integrated circuits; frequency division multiplexing; impedance convertors; microwave integrated circuits; microwave power amplifiers; wireless LAN; AM-PM distortion; CMOS Doherty power amplifier; OFDM; WLAN applications; WiMAX applications; frequency 4 GHz to 5 GHz; impedance transformer; integrated hybrid coupler; linear power amplifier; size 90 nm; voltage 1.4 V; Capacitors; Distortion measurement; Impedance matching; Inductors; OFDM; Power amplifiers; Slabs; Transmission lines; WiMAX; Wireless LAN; AM-PM distortion; Doherty amplifier; Linear power amplifier;
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 2007 IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
1-4244-0530-0
Electronic_ISBN :
1529-2517
DOI :
10.1109/RFIC.2007.380915
