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A 600MHz CMOS OFDM LINC transmitter with a 7 bit digital phase modulator

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5 Author(s)
Kwan-Woo Kim ; Georgia Inst. of Technol., Atlanta, GA ; Sangjin Byun ; Kyutae Lim ; Chang-Ho Lee
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This paper presents a new architecture for a LINC transmitter adopting a digital phase modulator (DPM). The DPM uses a 7 bit digital input to directly modulate the RF phase of each path, thus simplifying gain/phase mismatch compensation. Furthermore, this feature needs only one set of test signals for gain and phase mismatch detection. The implemented LINC transmitter IC consumes 140 mA from a 1.9V supply including an LC quadrature VCO, two DPMs, and two PA driver amplifiers, and it transmits a 6 MHz bandwidth 64-QAM OFDM signal in the UHF TV band with external switching PAs and a power combiner.

Published in:

Radio Frequency Integrated Circuits Symposium, 2008. RFIC 2008. IEEE

Date of Conference:

June 17 2008-April 17 2008