Papers by jan van der spiegel
2009 European Microwave Conference (EuMC)
ABSTRACT We give an overview of our work on biologically-inspired polarization imaging. We first ... more ABSTRACT We give an overview of our work on biologically-inspired polarization imaging. We first review the biophysical mechanisms of polarization vision, and then we present sample results of our bio-inspired imaging techniques.
Nanostructure science and technology, 2004
A Signal Adaptive Control #SAC# architecture for a second-order ## modulator ###M # design is pre... more A Signal Adaptive Control #SAC# architecture for a second-order ## modulator ###M # design is presented. The proposed architecture e#ectively reduces the power dissipation and the harmonic distortion of the #rst stage integrator in the modulator. The essence of this architecture, is to switch o# the DAC feed-back signal to the #rst stage during some iterations, and to compensate the signal at the input of the second stage, in an adaptive manner. Transistor-level simulations have shown the feasibility of this architecture. 1. INTRODUCTION Recently,work #1,2# has been directed towards lowvoltage #low-power ##M designs with switched opamp techniques. For a better power-resolution-speed trade-o# in the ##M design, the in-band quantization noise should be less than the in-band thermal noise. Even when this is satis#ed, the #rst stage SC integrator usually consumes 60#-75# of the total power of the modulator. The reason for this observation is discussed as follows. For low-voltage design...
IEEE Solid-State Circuits Magazine, 2011
Catheter-Based Sensing and Imaging Technology, 1989
The paper discusses the fabrication and the test results of a blood urea nitrogen sensor (BUN) an... more The paper discusses the fabrication and the test results of a blood urea nitrogen sensor (BUN) and a chloride sensor. The BUN sensor consists of a potentiometric ammonium ion sensor covered by a polymer membrane that contains the immobilized enzyme urease. The chloride sensor is a liquid membrane type electrode. Both electrodes are batch fabricated. The sensors are part of a multispecies sensor chip. The results of the sensor in aqueous solutions and blood will be given. Good uniformity and reproducibility is obtained. The BUN sensor has a linear range of 1 to 20 mM urea and a coefficient of variation of 3% in normal blood.
Journal of Applied Physics, 1991
The growth of ZrSi2 and Zr2CuSi4 has been achieved by rapid thermal processing in vacuum. Fast he... more The growth of ZrSi2 and Zr2CuSi4 has been achieved by rapid thermal processing in vacuum. Fast heating rates and temperatures of at least 950 °C are required to form smooth Zr disilicide with a room-temperature resistivity of 34 μΩ cm. In agreement with the bulk phase diagram, the ternary compound can be prepared by reacting Cu with the disilicide. This phase is formed through the diffusion and the insertion of Cu atoms into the twin faults of the pseudolamellar C 49 Zr silicide structure; it belongs to the same Cmcm space group. Electrical measurements indicate that ZrSi2 is an electron conductor whereas a mixed conduction mechanism is found for the ternary samples.
IEEE Transactions on Circuits and Systems I: Regular Papers, 2014
In this paper, a low-power, multifunctional CMOS smart sensor node is designed for an electronic ... more In this paper, a low-power, multifunctional CMOS smart sensor node is designed for an electronic facade, which provides an alternative solution to the concept of energy-efficient responsive buildings. Various sensing capabilities, including light intensity sensing, temperature sensing, motion tracking, and compressive image acquisition, are implemented on the sensor node. An 80 80 image pixel array is employed for motion tracking and compressive image acquisition. Various operational modes are realized, including: 1) event generation mode; 2) motion tracking mode; and 3) video output mode in full-resolution or compressed by the region of interest (ROI). A low-power, high-throughput motion detection algorithm is proposed in this paper. The power consumption of the proposed work is modeled, analyzed, and compared with traditional motion detection methods. According to numerical analysis, the throughput can be increased by 45% while using the proposed design instead of traditional temporal differential motion tracking methods with simislar power consumption. The proposed algorithm is realized by a pixel-level focal-plane motion detection unit, consisting of switched-capacitor circuit, analog memory, and dual-threshold comparator. The proposed design was fabricated in 0.5 m 3M2P standard CMOS technology, occupying mm silicon area. The total power consumption is 17 W, while the pixel array is performing motion tracking with a frame rate of 30 fps and a supply voltage of 3.3 V.
IEEE Solid-State Circuits Society Newsletter, 2002
Journal of Microelectromechanical Systems, 2000
This paper reports on the first demonstration of multi-frequency (176, 222, 307, and 482 MHz) osc... more This paper reports on the first demonstration of multi-frequency (176, 222, 307, and 482 MHz) oscillators based on piezoelectric AlN contour-mode MEMS resonators. All the oscillators show phase noise values between-88 and-68 dBc/Hz at 1 kHz offset and phase noise floors as low as-160 dBc/Hz at 1 MHz offset. The same Pierce circuit design is employed to sustain oscillations at the 4 different frequencies, while the oscillator core consumes at most 10 mW. The AlN resonators are currently wirebonded to the integrated circuit realized in the AMIS 0.5 μm 5 V CMOS process. This work constitutes a substantial step forward towards the demonstration of a singlechip multi-frequency reconfigurable timing solution that could be used in wireless communications and sensing applications.
Electronics Letters, 2009
An image sensor comprising an array of 128 by 50 super pixels, column parallel current conveyors ... more An image sensor comprising an array of 128 by 50 super pixels, column parallel current conveyors and global difference double sampling (DDS) unit is presented. The super pixel consists of: a reset transistor, a readout transistor, four transfer transistors and four photodiodes. The photo pixel address switch is placed outside the pixel, effectively implementing 1.5 transistors per pixel using a sharing scheme of the readout and reset transistor. The column FPN of 0.43% from saturated level and SNR of 43.9 dB is measured. The total power consumption is 5 mW at 30 frame/s.
Electronics Letters, 1993
Electronics Letters, 1991
Electronics Letters, 2000
The operation waveform of the proposed flip-flop is illustrated in Fig. 2, which is obtained by H... more The operation waveform of the proposed flip-flop is illustrated in Fig. 2, which is obtained by HSPICE simulation. In Fig. 3, we compare the voltage current Z (Vdd) of the previously proposed flip-flop [2] and the flip-flop proposed in this Letter. The proposed flip-flop restrains the ...
Computer Applications in Engineering Education, 2002
The authors report the results of a project to reemphasize high quality, hands-on laboratory cour... more The authors report the results of a project to reemphasize high quality, hands-on laboratory courses in the engineering curriculum while reducing their costs through the application of web-based teaching tools. The project resulted in substantial gains in productivity of faculty and staff, increased utilization of laboratory space, cost reductions in equipment, and improved quality of learning for our students.
Applied Physics Letters, 1990
The growth of copper silicide has been studied by rapid thermal processing (RTP) of 500 A˚ of Cu ... more The growth of copper silicide has been studied by rapid thermal processing (RTP) of 500 A˚ of Cu on Si substrates. Interaction between the diffusing metal and Si starts at 250–300 °C. Annealing at higher temperatures yields complete silicidation to Cu3Si. This leads to strong modifications of the Auger line shapes of both Si and Cu. A plasmon peak located 20 eV below the main peak is the fingerprint in the Cu spectrum. Strong features at 80, 85.6, 89.2, and 93.2 eV as well as a 1 eV shift of the 90.4 eV peak appear in the Si L2,3VV spectrum. Whether for Cu films annealed in nitrogen or in vacuum, exposure of the silicide to air results in the growth of silicon oxide at room temperature and continues until the silicide layer is totally converted. This repeatable and controllable oxidation of silicon is accompanied by changes in resistivity and color reflecting the extent of the process. For Cu/CoSi2/Si structures, the cobalt silicide acts as a transport medium for the growth of the copper silicide and also serves as a cap preventing the oxidation of the final CoSi2/Cu3Si/Si contacts
ABSTRACT A Signal Adaptive Control (SAG) architecture for a second-order ΔΣ modulator (ΔΣM) desig... more ABSTRACT A Signal Adaptive Control (SAG) architecture for a second-order ΔΣ modulator (ΔΣM) design is presented. The proposed architecture effectively reduces the power dissipation and the harmonic distortion of the first stage integrator in the modulator. The essence of this architecture, is to switch off the DAC feedback signal to the first stage during some iterations, and to compensate the signal at the input of the second stage, in an adaptive manner. Transistor-level simulations have shown the feasibility of this architecture
For the first time, this work demonstrates a switch-less dual-frequency (472-MHz and 1.94-GHz) re... more For the first time, this work demonstrates a switch-less dual-frequency (472-MHz and 1.94-GHz) reconfigurable CMOS oscillator using a single piezoelectric AlN MEMS resonator with co-existing S0 and S1 Lamb-wave modes of vibration. High performances (high Q and kt 2 for a resonator and low phase noise for an oscillator) have been achieved for both the resonator and oscillator in terms of dual-mode operation. Especially, the 1.94-GHz operation has the best phase noise performance when compared with all previously reported CMOS oscillators that work at a similar frequency.
Uploads
Papers by jan van der spiegel