Kwan-Woo Kim, S. Byun, K. Lim, Chang-Ho Lee, J. Laskar
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A 600MHz CMOS OFDM LINC transmitter with a 7 bit digital phase modulator
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.
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