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A 250 GHz Wideband Direct-Conversion CMOS Receiver Adopting Baseband Equalized Low-Loss Resistive Passive Mixer
This brief proposes a 250 GHz wideband mixer-first and direct-conversion RX adopting a baseband (BB) equalized single-balanced resistive mixer. The conventional resistive mixer suffers from the trade-off between gain and bandwidth, which hinders the wideband and low-loss mixer implementation. To add...
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Published in: | IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2023-10, Vol.70 (10), p.1-1 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
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Summary: | This brief proposes a 250 GHz wideband mixer-first and direct-conversion RX adopting a baseband (BB) equalized single-balanced resistive mixer. The conventional resistive mixer suffers from the trade-off between gain and bandwidth, which hinders the wideband and low-loss mixer implementation. To address this challenge, the proposed RX employs the BB equalization technique that compensates for the narrowband response of the low-loss mixer by cascading it with the deliberately shaped response of the following BB amplifier, thereby achieving low-loss yet wideband characteristics of the overall receiver chain. Moreover, the conversion gain and the noise figure of the single-balanced mixer are further improved by adopting a λ/4 open stub that suppresses the undesired LO leakage. Implemented in a 65 nm CMOS, the proposed RX achieves an effective 3-dB bandwidth of 26 GHz while dissipating a total dc power of 132 mW. Based on the calculated signal to noise-and-distortion ratio (SNDR), the proposed RX is expected to support a 16QAM demodulation with a data rate higher than 100 Gbps, in principle. |
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ISSN: | 1549-7747 1558-3791 |
DOI: | 10.1109/TCSII.2023.3289215 |