M. Sawan

Learn More
  • M. Sawan
  • 2004
This invited paper covers circuit techniques and design methods employed to build high reliability systems dedicated to implement implantable and wirelessly controlled smart medical devices such as sensors and microstimulators. A global view of typical microdevices such us neural signals monitoring device, cortical multichannel stimulator, as well as(More)
In this paper, a new design for a voltage-controlled ring oscillator (VCO) is presented. Implemented in 0.8 µm High-Voltage CMOS/DMOS technology provided by DALSA semiconductor with 5V power supply, this circuit uses relatively devices dimensions and low stages number to operate at low frequency. The new VCO combines three control methods to vary the(More)
The design of an ultra low-power CMOS chopper stabilized front-end suitable for a fully implantable cortical data acquisition system (CDAS) is presented The proposed low-power front-end improves recording quality and is area efficient. It removes low frequency noise and achieves submicrovolt input offset. The key to its performances is chopper modulation(More)
This paper describes a low-noise, low-power and low-voltage analog front-end amplifier integrated in implantable electronic devices and dedicated to very low amplitude signal acquisition. Low noise and low DC offset are obtained by means of Chopper Stabilization (CHS) technique. In addition, due to adding a rail to rail input stage, low power supply (1.8V)(More)
A CMOS image sensor with pixel level analog to digital conversion is presented. Each 13.8µm x 13.8µm pixel area contains a photodiode and a dynamic comparator using the maximum voltage swing available (0V-1.8V). The comparator does not need any bias current and is insensitive to fabrication process variations. Also a digital to analog converter (DAC) is(More)
Hardware acceleration in high performance computing context is of growing interest, particularly in the field of Monte Carlo methods where the resort to FPGA technology enhances execution speed by several orders. For this purpose, a particular attention has been given lately to hardware-based non-uniform random variate generators. In this paper we present(More)
In this paper, we present a hybrid capacitive sensor featuring a 0.18mum CMOS integrated circuit incorporated with a microfluidic channel and a polyelectrolyte sensing layer (PSL). We describe the formation of ultrathin PSL atop a microfabricated gold electrode (MGE) and CMOS sensor, and thereafter demonstrate the viability of this new approach for Lab-(More)
A system integration for High Voltage (HV) electrostatic MicroElectroMechanical Systems (MEMS) actuators is introduced on a micro-Printed Circuit Board (PCB). The system includes a programmable microcontroller, a programmable DC/DC converter, a multi output HV interface and electrostatic MEMS actuators. The system produces high output voltages (10-300V) and(More)
A 4th-order bandpass /spl Sigma//spl Delta/ modulator for ultrasound applications is presented. By cascading 2 identical 2nd-order Gm-C filters, the 4th-order modulator is designed with high power efficiency, stability and programmability. The modulator dynamic range is 78dB over a 200kHz bandwidth around IF frequency of 3 MHz. The modulator has been(More)
We present a biochemical sensor array based on a flexible conducting polymer biointerface for multifunctional monitoring. The large area and highly sensitive bioelectrodes are fabricated on a low cost nylon fabric for potential environmental lab-on-chips. Based on experimental results, a high resistive change is observed on such electrodes (30(More)