W-band double-balanced down-conversion mixer with Marchand baluns in silicon-germanium technology

2014 11th International Symposium on Wireless Communications Systems (ISWCS)

2014

A W-band double-balanced down-conversion mixer for automotive radars using standard 90 nm CMOS technology is reported. The mixer comprises a doublebalanced Gilbert cell with inductive source-degeneration RF transconductance stage for RF-port input matching bandwidth and conversion gain (CG) enhancement, a Marchand balun for converting the single RF input signal to differential signal, a Marchand balun for converting the single LO input signal to differential signal, and a baseband amplifier. The mixer consumes 13 mW and achieves excellent RF-port input reflection coefficient of −13.1~ −19.4 dB and LO-port input reflection coefficient of −9.1~ −11.8 dB for frequencies of 75~85 GHz. In addition, for frequencies of 75~85 GHz, the mixer achieves CG of −1~1.5 dB, LO-RF isolation of 43.5~49.2 dB, LO-IF isolation of 56.5~64.5 dB and RF-IF isolation of 35.9~39.4 dB, one of the best CG and port-to-port isolation results ever reported for a CMOS down-conversion mixer with operation frequency around 80 GHz.

Section: Resultsmentioning

confidence: 99%

A W-band down-conversion mixer in 90 nm CMOS with excellent matching and port-to-port isolation for automotive radars

2014 11th International Symposium on Wireless Communications Systems (ISWCS)

2014

“…Compared with the 76–77 GHz CMOS mixer in , the proposed mixer exhibits better CG, port‐to‐port isolations, and FOM. Compared with the 75–110 GHz SiGe HBT mixer in , the proposed mixer exhibits much lower power consumption, and better port‐to‐port isolations and FOM. These results indicate that the proposed down‐conversion mixer with integrated Marchand baluns is suitable for W‐band transceiver systems.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, several excellent CMOS and SiGe BiCMOS down‐conversion mixers for operation frequencies around 80 GHz have been reported . For example, in , a 76–77 GHz downconversion mixer consisting of a double‐balanced Gilbert‐cell core and two transformer‐based baluns in 65 nm CMOS process is demonstrated.…”

Section: Introductionmentioning

confidence: 99%

“…Although low‐power consumption of 6 mW was achieved, its CG of −8 dB, LO‐RF isolation of 21 dB, and LO‐IF isolation of 32 dB were not good enough. In , a 75–110 GHz double‐balanced Gilbert cell down‐conversion mixer in a 200 GHz f T SiGe process is demonstrated. Although high CG of 14.4 dB was achieved, its LO‐RF isolation of 30 dB and power consumption of 92.4 mW were not satisfactory.…”

Section: Introductionmentioning

confidence: 99%

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A 75–85 GHz down‐conversion mixer with integrated Marchand baluns in 90 nm CMOS with excellent matching and port‐to‐port isolation for automotive radars

Micro & Optical Tech Letters

Hiếu³

2014

A 75-85 GHz double-balanced down-conversion mixer for automotive radars using standard 90 nm CMOS technology is reported. The down-conversion mixer comprises a double-balanced Gilbert cell with inductive source-degeneration RF transconductance stage for RF-port input matching bandwidth and conversion gain (CG) enhancement, a Marchand balun for converting the single RF input signal to differential signal, a Marchand balun for converting the single LO input signal to differential signal, and a baseband amplifier. The mixer consumes 13 mW and achieves excellent RF-port input reflection coefficient of 213.1 to 219.4 dB and LO-port input reflection coefficient of 29.1 to 211.8 dB for frequencies of 75-85 GHz. In addition, for frequencies of 75-85 GHz, the mixer achieves CG of 21 to 1.5 dB, LO-RF isolation of 43.5-49.2 dB, LO-IF isolation of 56.5-64.5 dB and RF-IF isolation of 35.9-39.4 dB, one of the best CG and port-to-port isolation results ever reported for a CMOS down-conversion mixer with operation frequency around 80 GHz. Furthermore, the mixer achieves an excellent input third-order intercept point of 2.7 dBm at 79 GHz. These results demonstrate the proposed down-conversion mixer architecture is promising for W-band transceivers.

“…The two most popular types of doubly balanced mixers (DBMs) are doubly balanced star mixers (DBSMs) and doubly balanced ring mixers (DBRMs). Research on broadband doubly balanced star mixer (DBSM) and doubly balanced ring mixer (DBRM) has been welldeveloped for decades [6,7,8,9,10,11,12,13,14,15,16].…”

Section: Introductionmentioning

confidence: 99%

Design of a 35–95 GHz fundamental monolithic mixer based on a novel IF extraction structure

IEICE Electron. Express

Zhang²,

Jia³

et al. 2019

The letter presents a high-performance doubly balanced ring mixer (DBRM) fabricated by a 0.1 µm GaAs pHEMT process that achieves ultrawide radio-frequency (RF) and intermediate frequency (IF) bandwidths. A multiple-coupled-line Marchand balun is optimized to extend the RF bandwidth. A novel structure is designed to directly extract the IF current from the RF balun without an additional IF coupler. Due to the proposed IF extraction structure, the IF bandwidth is broadened with decreased complexity. The size of the whole chip including the probe GSG pads is 0.95×0.65 mm 2 . The measured results show that the conversion loss is 7.2-11.9 dB for the RF frequency range of 35-95 GHz with an LO power level of 14 dBm and a fixed IF frequency of 1 GHz. In addition, the conversion loss is better than 12 dB for the IF frequency range from DC to 30 GHz under a fixed LO frequency. key words: ultrawide bandwidth, doubly balanced ring mixer (DBRM), Marchand balun, monolithic microwave integrated circuit (MMIC) Classification: Microwave and millimeter-wave devices, circuits, and modules