A 0.13 μm CMOS transmitter with 72-dB RF gain control for mobile WiMAX/WiBro applications

A direct conversion transmitter for mobile WiMAX/WiBro applications is developed. It is composed of a reconstruction filter, an I/Q modulator, a four-stage RF programmable gain amplifier (PGA), and a power amplifier (PA) driver. A 7-bit digital-to-analog converter (DAC) is also implemented to compen...

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Bibliographic Details
Published in2008 IEEE Radio Frequency Integrated Circuits Symposium pp. 105 - 108
Main Authors Hsin-Hung Kuo, Yang-Han Li, Yi-Hsin Pang
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2008
Subjects
direct upconversion
Electronics packaging
Filters
Gain control
Modulation coding
Power amplifiers
programmable gain amplifier (PGA)
Radio frequency
Radiofrequency amplifiers
reconstruction filter
transmitter
Transmitters
Voltage
WiBro
WiMAX
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Summary:A direct conversion transmitter for mobile WiMAX/WiBro applications is developed. It is composed of a reconstruction filter, an I/Q modulator, a four-stage RF programmable gain amplifier (PGA), and a power amplifier (PA) driver. A 7-bit digital-to-analog converter (DAC) is also implemented to compensate the DC offset in the modulator due to device mismatch. A 72-dB gain control range in 1-dB step is available by the RF PGA and the maximum relative gain error is less than 0.5 dB. The transmitter has a maximum voltage gain of 4.3 dB and OP1dB of 9.6 dBm. For a WiMAX OFDMA 64QAM-3/4 modulated signal, the best measured error vector magnitude (EVM) is 1.5% with -5 dBm output power. A 1.2 Vsupply voltage is used for the transmitter except that 2.5 V is used for the PA driver. The chip is fabricated in a 0.13 mum 1P8M CMOS process and consumes 164 mW DC power.
ISBN:9781424418084
1424418089
ISSN:1529-2517
2375-0995
DOI:10.1109/RFIC.2008.4561396