Saqib Mohamad

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In this paper we present a temperature sensor based on a ring oscillator. The ring oscillator uses the CMOS thyristor delay element and has an extremely low power consumption of about 47nW at room temperature with a supply of 0.5V. Low power operation is achieved by eliminating the use of power hungry analog to digital converters (ADCs) at the sensor(More)
A CMOS on-chip ID generation scheme is proposed. Using the antenna effect during the chip fabrication, one gate in a transistor pair is physically randomly broken down due to the process variation and an on-chip ID number is thus created depending on its polarity. The generated ID not only is permanently immune from environment changes such as supply(More)
This paper presents a passive RFID tag with an embedded temperature sensor intended for the EPC Gen-2 protocol operating in the 902-928 MHz ISM band. The design is implemented as a node of a low cost temperature sensors network. The system is powered by a remote power through the RF energy received from the reader in order to create autonomous temperature(More)
In this paper we propose a temperature sensor, based on a voltage to time converter cell (VTC). A VTC is frequently employed in time to digital converters for generating a delay that is proportional to the input voltage. The delay can then be digitized using a simple ripple counter at the output driven by a temperature independent clock. The power(More)
A nested chopped current-feedback instrumentation amplifier (CFIA) designed for micro-fluidic applications is reported in this work. The proposed CFIA is chopped at 50kHz to bring input-referred offset below 12μV and flicker-noise corner around 100mHz. In order to further suppress the residue offset to nV-level, the CFIA is again chopped with a(More)
In this paper, we presented a wafer-level encapsulated Thermoresistive Micro Calorimetric Flow (TMCF) sensor with the integrated packaging by using the proprietary InvenSense CMOS MEMS technology. For the nitrogen gas flow from &#x2212;26m/s to 26m/s, the pulsed operated TMCF sensor (device size &#x003D; 3.4mm<sup>2</sup>) under the Constant Temperature(More)
We present an integrated complimentary metal-oxide-semiconductor (CMOS) MEMS flow sensor, which demonstrates a very compact system on chip (SoC) that can sense <inline-formula> <tex-math notation="LaTeX">$N_{\mathbf {2}}$ </tex-math></inline-formula> gas flow ranging from 0 to 26 m/s (0&#x2013;50 sccm). Implemented in the proprietary InvenSense AlN process,(More)
Incremental analog to digital converters (lADCs) are aimed at converting low frequency signals with high accuracy. However the use of high oversampling ratios (OSR) usually decreases the conversion speed making them energy inefficient. The first integrator also consumes a lot of power due to high settling requirements, if a single bit quantizer is used.(More)
A micro-power incremental delta-sigma (I-&#x03A3;S) ADC is presented. This ADC uses its decimation filter's output to estimate the input signal level and dynamically adjusts the modulator feedback voltage, thereby reducing the integrator input range and power. For further power saving, integrator time-multiplexing is also employed. Fabricated in(More)
An integrated low-cost micro BTU (&#x03BC;&#x0392;&#x03A4;&#x03C5;) sensor system, including a thermoresistive micro calorimetric flow (TMCF) sensor and a resistance temperature detector (RTD), is reported for the first time using a proprietary InvenSense CMOS MEMS technology integrated with a digital signal processing (DSP) unit. The proposed BTU sensor(More)