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A Digital Envelope Modulator for a WLAN OFDM Polar Transmitter in 90 nm CMOS

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2 Author(s)
van Zeijl Paul, T.M. ; Philips Res., Eindhoven ; Collados, M.

A digital envelope modulator as part of a polar transmitter architecture for the 802.11a/g WLAN OFDM standards is investigated. The digital envelope modulator is quite similar to a state-of-the-art DAC design, but now it has been optimized to deal with envelope signals. A thermometer-coded envelope DAC has been implemented in a 90 nm digital CMOS process. Measurements of a test chip show the digital envelope modulator to reach an OFDM output power of 5 dBm for 54 Mb/s using 64 QAM at 2.45 GHz and fulfilling EVM specifications and in-band spectral mask requirements using just 12.7 mW from a 1.2 V supply. Combining the digital envelope modulator with an off-chip power amplifier gives an output power of 20.4 dBm, while fulfilling EVM specifications and in-band spectral mask requirements. The output power of the presented envelope DAC can be increased in a re-design by scaling device sizes. The envelope DAC is a key component in a software-defined-radio transmitter.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:42 ,  Issue: 10 )
RFIC Virtual Journal, IEEE

Date of Publication:

Oct. 2007

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