A Novel Concurrent 2229/5764-GHz Dual-Band CMOS Step Attenuator With Low Phase Variations
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2016 IEEE. A novel 22-29/57-64-GHz concurrent dual-band CMOS 4-bit step attenuator with small phase variations is presented. A new integrated diplexer-attenuator possessing both attenuation and diplexer filtering functions is used to achieve the concurrent dual-band response for the 22-29/57-64-GHz concurrent dual-band attenuator, which leads to small size and low insertion loss. The 22-29/57-64-GHz concurrent dual-band attenuator also includes a new distributed attenuator configured to result in small phase variation. The 22-29/57-64-GHz concurrent dual-band attenuator is fabricated using a 0.18-m BiCMOS technology. The measured insertion loss, root-mean-square (rms) amplitude error, and rms phase error are less than 7.9 dB, 0.55 dB, and 4.7 in the first passband of 22-29 GHz, respectively. In the second passband, 57-64 GHz, the measured insertion loss, rms amplitude error, and rms phase error are less than 11 dB, 1.5 dB, and 4.1, respectively. The measured stopband rejections over the 16 states are greater than 28 and 31 dB at 12 and 36 GHz, respectively. The core chip size is 1.8 0.52 mm 2 .