%0 Conference Paper %1 10186184 %A Lotfi, Hadi %A Kern, Michal %A Striegler, Nico %A Unden, Thomas %A Scharpf, Jochen %A Schalberger, Patrick %A Schwartz, Ilai %A Neumann, Philipp %A Anders, Jens %B 2023 IEEE Radio Frequency Integrated Circuits Symposium (RFIC) %D 2023 %K from:michalkern myown %P 253-256 %R 10.1109/RFIC54547.2023.10186184 %T A Diamond Quantum Magnetometer Based on a Chip-Integrated 4-way Transmitter in 130-nm SiGe BiCMOS %X Solid-state magnetometers based on color centers in diamond are emerging as one of the leading quantum sensors due to their outstanding room-temperature properties, such as high sensitivity and calibration-free long-term stability. However, their integration into compact systems is still an active area of research. To tackle this challenge, in this paper, we present a quantum magnetometer based on negatively charged nitrogen-vacancy (NV) centers using a custom-designed, chip-integrated 4-way transmitter. In combination with a custom-designed microcoil array, the 4-way transmitter delivers microwave magnetic fields up to 226 µT for carrier frequencies around 7 GHz with a conversion gain of ≥32 dB to NV centers. The local oscillator (LO) signal required to drive the on-chip quadrature upconversion mixer is generated by a custom-designed quadrature PLL, which provides a 22% tuning range between 6.4 and 8 GHz, and a low phase noise of -122 dBc/Hz at 1 MHz offset from a 7 GHz carrier, to enable broadband, low-noise magnetometry. To verify the excellent performance of the integrated electronics, we have embedded them into a widefield diamond magnetometer using off-chip scanning optics, achieving a state-of-the-art AC-magnetic field limit of detection of 300 pT/Hz1/2.

@inproceedings{10186184, abstract = {Solid-state magnetometers based on color centers in diamond are emerging as one of the leading quantum sensors due to their outstanding room-temperature properties, such as high sensitivity and calibration-free long-term stability. However, their integration into compact systems is still an active area of research. To tackle this challenge, in this paper, we present a quantum magnetometer based on negatively charged nitrogen-vacancy (NV) centers using a custom-designed, chip-integrated 4-way transmitter. In combination with a custom-designed microcoil array, the 4-way transmitter delivers microwave magnetic fields up to 226 µT for carrier frequencies around 7 GHz with a conversion gain of ≥32 dB to NV centers. The local oscillator (LO) signal required to drive the on-chip quadrature upconversion mixer is generated by a custom-designed quadrature PLL, which provides a 22% tuning range between 6.4 and 8 GHz, and a low phase noise of -122 dBc/Hz at 1 MHz offset from a 7 GHz carrier, to enable broadband, low-noise magnetometry. To verify the excellent performance of the integrated electronics, we have embedded them into a widefield diamond magnetometer using off-chip scanning optics, achieving a state-of-the-art AC-magnetic field limit of detection of 300 pT/Hz1/2.}, added-at = {2023-07-28T14:01:43.000+0200}, author = {Lotfi, Hadi and Kern, Michal and Striegler, Nico and Unden, Thomas and Scharpf, Jochen and Schalberger, Patrick and Schwartz, Ilai and Neumann, Philipp and Anders, Jens}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2db976a1a1a1895da5af2bd1f08df6601/iis}, booktitle = {2023 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)}, doi = {10.1109/RFIC54547.2023.10186184}, interhash = {11fb03c29af84a44db5e2d8a55adc663}, intrahash = {db976a1a1a1895da5af2bd1f08df6601}, issn = {2375-0995}, keywords = {from:michalkern myown}, month = {June}, pages = {253-256}, timestamp = {2023-07-28T14:01:43.000+0200}, title = {A Diamond Quantum Magnetometer Based on a Chip-Integrated 4-way Transmitter in 130-nm SiGe BiCMOS}, year = 2023 }