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This paper reports a flexible direct digital modulation based low power transmitter in 90 nm CMOS that supports constant-envelope modulation using phase or frequency modulation for carrier frequencies from 100 MHz to 2.5 GHz. For rectangular filtered 8-PSK modulation from 1 K symbol/s to 20 M symbol/s the RMS phase error is less than 4 deg. Frequency modulation is measured via filtered frequency shift...
This paper describes a fundamentally flexible low power transceiver implemented in 90 nm CMOS. Novel circuit architectures have been implemented to overcome problems that have encumbered wideband transceivers in the past. Flexible programming allows the RFIC to process signals of multiple wireless protocols from 100 MHz - 2.5 GHz with channel bandwidths from 8 KHz to 20 MHz. At 1.8 GHz the receiver...
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