Bipolar Circuits for Readout of an Integrated Silicon Color Sensor. - Reinoud F. Wolffenbuttel; Ger de Graaf; E. Engen (ISCAS, 1995)

A CMOS optical microspectrometer with light-to-frequency converter, bus interface, and stray-light compensation. - José Higino Correia; Ger de Graaf; Marian Bartek; Reinoud F. Wolffenbuttel (IEEE Trans. Instrum. Meas., 2001)

Bulk micromachined electrostatic RMS-to-DC converter. - Ger de Graaf; Marian Bartek; Zhixiong Xiao; Cees J. van Mullem; Reinoud F. Wolffenbuttel (IEEE Trans. Instrum. Meas., 2001)

A single-chip CMOS optical microspectrometer with light-to-frequency converter and bus interface. - José Higino Correia; Ger de Graaf; Marian Bartek; Reinoud F. Wolffenbuttel (IEEE J. Solid State Circuits, 2002)

Quadrature oscillator with pre-distorted waveforms for application in MEMS-based mechanical spectrum analyser. - Ger de Graaf; Lukas Mol; Luís A. Rocha; Edmond Cretu; Reinoud F. Wolffenbuttel (ESSCIRC, 2004)

Circuit for readout and linearisation of sensor bridges. - Ger de Graaf; Reinoud F. Wolffenbuttel (ESSCIRC, 2004)

Illumination source identification using a CMOS optical microsystem. - Ger de Graaf; Reinoud F. Wolffenbuttel (IEEE Trans. Instrum. Meas., 2004)

Systematic Approach for the Linearization and Readout of Nonsymmetric Impedance Bridges. - Ger de Graaf; Reinoud F. Wolffenbuttel (IEEE Trans. Instrum. Meas., 2006)

Dielectric spectroscopy for measuring the composition of gasoline/water/ethanol mixtures. - Ger de Graaf; Giuseppe Lacerenza; Reinoud F. Wolffenbuttel; Jaco H. Visser (I2MTC, 2015)

Active guarding of a four-point impedance probe with one common guard electrode for maximum readout bandwidth. - Reinoud F. Wolffenbuttel; Ger de Graaf (I2MTC, 2015)

Combining impedance spectroscopy with optical absorption spectroscopy in the UV for biofuel composition measurement. - Luke Middelburg; Mohammadamir Ghaderi; Andre Bossche; Jeroen Bastemeijer; Ger de Graaf; Reinoud F. Wolffenbuttel; Rick Soltis; Jaco H. Visser (I2MTC, 2017)

Heart rate monitoring using infrared thermometry in an earpiece. - Daniel Kuratomi Cruz; Ger de Graaf; Jaap C. Haartsen; Frank N. M. Hooijschuur; Paddy J. French (IEEE SENSORS, 2017)

A phase-domain readout circuit for a CMOS-compatible thermal-conductivity-based carbon dioxide sensor. - Zeyu Cai 002; Robert H. M. van Veldhoven; Hilco Suy; Ger de Graaf; Kofi A. A. Makinwa; Michiel A. P. Pertijs (ISSCC, 2018)

A Phase-Domain Readout Circuit for a CMOS-Compatible Hot-Wire CO2 Sensor. - Zeyu Cai 002; Robert H. M. van Veldhoven; Hilco Suy; Ger de Graaf; Kofi A. A. Makinwa; Michiel A. P. Pertijs (IEEE J. Solid State Circuits, 2018)

Heart Rate Extraction in a Headphone Using Infrared Thermometry. - Ger de Graaf; Daniel Kuratomi Cruz; Jaap C. Haartsen; Frank N. M. Hooijschuur; Paddy J. French (IEEE Trans. Biomed. Circuits Syst., 2019)