Design considerations of a low-noise receiver front-end and its spiral coil for portable NMR screening. - Diyang Zhao; Ka-Meng Lei; Pui-In Mak; Man-Kay Law; Rui Paulo Martins (APCCAS, 2014)

28.1 A handheld 50pM-sensitivity micro-NMR CMOS platform with B-field stabilization for multi-type biological/chemical assays. - Ka-Meng Lei; Hadi Heidari; Pui-In Mak; Man-Kay Law; Franco Maloberti; Rui Paulo Martins (ISSCC, 2016)

A µNMR CMOS Transceiver Using a Butterfly-Coil Input for Integration With a Digital Microfluidic Device Inside a Portable Magnet. - Ka-Meng Lei; Pui-In Mak; Man-Kay Law; Rui Paulo Martins (IEEE J. Solid State Circuits, 2016)

A 0.4V 4.8μW 16MHz CMOS crystal oscillator achieving 74-fold startup-time reduction using momentary detuning. - Ka-Meng Lei; Pui-In Mak; Rui Paulo Martins (ISCAS, 2017)

A Handheld High-Sensitivity Micro-NMR CMOS Platform With B-Field Stabilization for Multi-Type Biological/Chemical Assays. - Ka-Meng Lei; Hadi Heidari; Pui-In Mak; Man-Kay Law; Franco Maloberti; Rui Paulo Martins (IEEE J. Solid State Circuits, 2017)

A 0.4 V 6.4 μW 3.3 MHz CMOS Bootstrapped Relaxation Oscillator with ±0.71% Frequency Deviation over -30 to 100 °C for Wearable and Sensing Applications. - Ka-Meng Lei; Pui-In Mak; Rui Paulo Martins (ISCAS, 2018)

A regulation-free sub-0.5V 16/24MHz crystal oscillator for energy-harvesting BLE radios with 14.2nJ startup energy and 31.8pW steady-state power. - Ka-Meng Lei; Pui-In Mak; Man-Kay Law; Rui Paulo Martins (ISSCC, 2018)

A Regulation-Free Sub-0.5-V 16-/24-MHz Crystal Oscillator With 14.2-nJ Startup Energy and 31.8-µW Steady-State Power. - Ka-Meng Lei; Pui-In Mak; Man-Kay Law; Rui Paulo Martins (IEEE J. Solid State Circuits, 2018)

A 0.45-V 3.3-µW Resistor-Based Temperature Sensor Achieving 10mK Resolution in 65-nm CMOS. - Ka-Meng Lei; Pui-In Mak; Rui Paulo Martins (ICTA, 2021)

A 0.35-V 5, 200-μm2 2.1-MHz Temperature-Resilient Relaxation Oscillator With 667 fJ/Cycle Energy Efficiency Using an Asymmetric Swing-Boosted RC Network and a Dual-Path Comparator. - Ka-Meng Lei; Pui-In Mak; Rui Paulo Martins (IEEE J. Solid State Circuits, 2021)

Startup Time and Energy-Reduction Techniques for Crystal Oscillators in the IoT Era. - Ka-Meng Lei; Pui-In Mak; Rui Paulo Martins (IEEE Trans. Circuits Syst. II Express Briefs, 2021)

A Portable CMOS-based MRI System with 67×67×83 µm3Image Resolution. - Daniel Krüger; Aoyang Zhang; Henry Hinton; Victor Marrugat Arnal; Yi-Qiao Song; Yiqiao Tang; Ka-Meng Lei; Jens Anders; Donhee Ham (ESSCIRC, 2022)

Fully-Integrated Timers for Ultra-Low-Power Internet-of-Things Nodes - Fundamentals and Design Techniques. - Mikki How-Wen Loo; Harikrishnan Ramiah; Ka-Meng Lei; Chee-Cheow Lim; Nai Shyan Lai; Pui-In Mak; Rui Paulo Martins (IEEE Access, 2022)

Miniaturization of a Nuclear Magnetic Resonance System: Architecture and Design Considerations of Transceiver Integrated Circuits. - Shuhao Fan; Qi Zhou; Ka-Meng Lei; Pui-In Mak; Rui Paulo Martins (IEEE Trans. Circuits Syst. I Regul. Pap., 2022)

Simple-Logic Comparator-Offset Mitigation Technique for Resistor-Based Temperature Sensor in DFLL. - Dan Shi; Ka-Meng Lei; Rui Paulo Martins; Pui-In Mak (ICTA, 2023)

A 12/13.56MHz Crystal Oscillator with Binary-Search-Assisted Two-Step Injection Achieving 5.0nJ Startup Energy and 45.8μs Startup Time. - Haihua Li; Ka-Meng Lei; Pui-In Mak; Rui Paulo Martins (ISSCC, 2023)

A Miniaturized 3-D-MRI Scanner Featuring an HV-SOI ASIC and Achieving a 10 × 8 × 8 mm3 Field of View. - Shuhao Fan; Qi Zhou; Ka-Meng Lei; Pui-In Mak; Rui Paulo Martins (IEEE J. Solid State Circuits, 2023)

A Portable CMOS-Based Spin Resonance System for High-Resolution Spectroscopy and Imaging. - Daniel Krüger; Aoyang Zhang; Behdad Aghelnejad; Henry Hinton; Victor Marrugat Arnal; Yi-Qiao Song; Yiqiao Tang; Ka-Meng Lei; Jens Anders; Donhee Ham (IEEE J. Solid State Circuits, 2023)

An Ultra-Low-Voltage Single-Crystal Oscillator-Timer (XO-Timer) Delivering 16-MHz and 32.258-kHz Clocks for Sub-0.5-V Energy-Harvesting BLE Radios in 28-nm CMOS. - Liwen Lin; Ka-Meng Lei; Pui-In Mak; Rui Paulo Martins (IEEE Open J. Circuits Syst., 2023)

A 0.4-V 0.0294-mm2 Resistor-Based Temperature Sensor Achieving ±0.24 °C p2p Inaccuracy From40 °C to 125 °C and 385 fJ · K2 Resolution FoM in 65-nm CMOS. - Dan Shi; Ka-Meng Lei; Rui Paulo Martins; Pui-In Mak (IEEE J. Solid State Circuits, 2023)

A 0.4-V 8400-μm2 Voltage Reference in 65-nm CMOS Exploiting Well-Proximity Effect. - Chengyu Che; Ka-Meng Lei; Rui Paulo Martins; Pui-In Mak (IEEE Trans. Circuits Syst. II Express Briefs, 2023)

A Miniaturized MRI Scanner Featuring a HighVoltage SOI ASIC for Non-Invasive Object Reconstruction and Flow Analysis. - Shuhao Fan; Qi Zhou; Ka-Meng Lei; Rui Paulo Martins; Pui-In Mak (BioCAS, 2024)

17.2 A Miniature Multi-Nuclei NMR/MRI Platform with a High-Voltage SOI ASIC Achieving a 134.4dB Image SNR with a 173×250×103μm3 Resolution. - Shuhao Fan; Qi Zhou; Ka-Meng Lei; Rui Paulo Martins; Pui-In Mak (ISSCC, 2024)

3.3 A 0.5V 6.14μW Trimming-Free Single-XO Dual-Output Frequency Reference with [5.1nJ, 120μs] XO Startup and [8.1nJ, 200μs] Successive-Approximation-Based RTC Calibration. - Rui Luo; Ka-Meng Lei; Rui Paulo Martins; Pui-In Mak (ISSCC, 2024)

A Fast Startup 38.4-MHz Crystal Oscillator Achieving 99-nJ Startup Energy With Adaptive Chirping. - Abdolraouf Rahmani; Harikrishnan Ramiah; Ka-Meng Lei; Chee-Cheow Lim; Nai Shyan Lai; Pui-In Mak; Rui Paulo Martins (IEEE Access, 2024)

A 12-/13.56-MHz Crystal Oscillator With Binary-Search-Assisted Two-Step Injection Achieving 5.0-nJ Startup Energy and 45.8-μs Startup Time. - Haihua Li; Ka-Meng Lei; Rui Paulo Martins; Pui-In Mak (IEEE J. Solid State Circuits, 2024)

Miniature Magnetic Resonance Imaging System for in situ Monitoring of Bacterial Growth and Biofilm Formation. - Qi Zhou; Shuhao Fan; Ka-Meng Lei; Donhee Ham; Rui Paulo Martins; Pui-In Mak (IEEE Trans. Biomed. Circuits Syst., 2024)

A 16-MHz Crystal Oscillator With 17.5- μ s Start-Up Time Under 104-ppm- Δ F Injection Using Automatic Phase-Error Correction. - Zixuan Wang; Xin Wang 147; Ka-Meng Lei; Wenjing Zhang; Yunjin Yin; Tailong Xu; Zhikuang Cai; Yufeng Guo; Pui-In Mak (IEEE J. Solid State Circuits, 2024)

A Linear-Regression-Assisted Trimming Scheme for CMOS Voltage Reference. - Chengyu Che; Yao Jiang; Xinfei Guo; Ka-Meng Lei; Rui Martins; Pui-In Mak (ISCAS, 2025)

A 0.4V Relaxation Oscillator featuring Double Capacitor-Charging Headroom in CMOS 65nm. - Kanghong Yu; Mingrui Wang; Ka-Meng Lei; Rui Martins; Pui-In Mak (ISCAS, 2025)

A Chip-based Miniature MRI Platform with Integrated PDMS-PCB Coil Frontend for Microlitre-volume Sample Analysis. - Qi Zhou; Shuhao Fan; Ka-Meng Lei; Rui Paulo Martins; Pui-In Mak (ISCAS, 2025)

27.5: A 4, 100µm2 Wire-Metal-Based Temperature Sensor with a Fractional-Discharge FLL and a Time-Domain Amplifier with ±0.2°C Inaccuracy (3σ) from -40 to 125°C and 45fJ·K2 Resolution FoM in 28nm CMOS. - Dan Shi; Ka-Meng Lei; Rui Paulo Martins; Pui-In Mak (ISSCC, 2025)

A 0.35-0.5-V 0.0136-mm² 12 -MHz Digital Frequency-Locked Loop With 1.06%/V Line Sensitivity in 65-nm CMOS. - Dan Shi; Ka-Meng Lei; Rui Paulo Martins; Pui-In Mak (IEEE Trans. Circuits Syst. II Express Briefs, 2025)

A 0.5-V 6.14- μW Trimming-Free Single-XO Dual-Output Frequency Reference With [5.1-nJ, 120- μs] XO Start-Up and [8.1-nJ, 200- μs] Successive-Approximation-Based RTC Calibration. - Rui Luo; Ka-Meng Lei; Rui Paulo Martins; Pui-In Mak (IEEE J. Solid State Circuits, 2025)

A Single-XO Dual-Output Frequency Reference Featuring Adaptive RTC Calibration Achieving 0.63 ppm/°C Temperature Coefficient From -40 °C to 125 °C. - Rui Luo; Ka-Meng Lei; Rui Paulo Martins; Pui-In Mak (IEEE Trans. Circuits Syst. II Express Briefs, 2025)

A Miniature Multinuclei NMR/MRI Platform With a High-Voltage SOI ASIC. - Shuhao Fan; Qi Zhou; Ka-Meng Lei; Rui Paulo Martins; Pui-In Mak (IEEE J. Solid State Circuits, 2025)