A 375 mW, 2.2 GHz signal bandwidth DAC-based transmitter with an in-band IM3 < −58 dBc in 40 nm CMOS

A 40 nm DAC-based CMOS wideband transmitter (WBTX) for cable applications is presented. It has a 2.2 GHz signal bandwidth and exhibits an in-band IM3 of less than -58 dBc. The WBTX consists of a current-steering DAC with digital sinc equalization and roll-off compensation. By implementing high-speed, feed-forward pipelined digital logic, the DAC sampling rate extends to 5 GHz. The WBTX can deliver up to +11 dBm of output power while consuming only 375 mW. The WBTX occupies 1.65 mm2 of area.

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