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An integrated capacitance sensor interface is proposed with three programmable gain stages to measure femto-farad capacitance. The capacitance sensor interface is a differential measurement set-up to measure the change in capacitance over a fixed nominal capacitance. The programmable gain stages are used to change the gain settings to operate for a wide-range capacitance measurement. The implemented...
CMOS-integrated capacitance based cell sensing has shown promising results for the monitoring cell volume growth. The process utilizes the direct correlation between cell health and measured capacitance. Prior sensors have used charge based capacitance measurement, which has limitations in offset correction, range and resolution. An alternative approach to monitoring small changes in the electrode...
A non intrusive temperature sensing based performance compensation of an integrated CMOS power amplifier is presented here. A differential-amplifier based temperature sensor, having an area of 25µm x 25µm, is used to measure the temperature around the RF circuits. The sources of temperature increase are analysed and their contribution to self heating are presented. The effects of self heating and...
Biomedical sensors use capacitance measurement for a variety of detection applications and capacitance measurement in the tens of femto-farad range need a low-noise environment. The capacitance sensor interface converts the capacitance change to frequency change to mitigate the noise and to operate in a noisy environment. Using differential sensing architecture and calibration, the frequency domain...
A frequency domain capacitance interface system is proposed for a femto-farad capacitance measurement. In this technique, a ring oscillator circuit is used to generate a change in time period, due to a change in the sensor capacitance. The time-period difference of two such oscillators is compared and is read-out using a phase frequency detector and a charge pump. The output voltage of the system,...
Radio frequency backscatter involves the modulation of antenna load with the message signal. The information content of the message signal appears in the amplitude of the reflected signal from the antenna. The message can either be a digital signal or an analog signal. The former results in a digital backscatter communication while the latter results in an analog backscatter communication. In this...
A novel technique to transmit identification and sensor information measured at the tag to the reader. The proposed system incorporates a technique to avoid collision in multi-tag environment without increasing complexity of the reader. The proposed device presents a novel idea to modulate a sensor and identification information in a single spike. It has ability to operate at low power as the system...
A time-frequency localization-based implementation of a novel technique to transmit identification and sensor information measured at the tag to the reader is presented. The proposed device presents a novel idea to modulate a sensor and ID information in a single spike. It has the ability to operate at low power as the system uses the proposed spike modulation technique with an analog backscatter...
Temperature variations significantly affect the performance and reliability of RF integrated circuits, which necessitates for thermal management in RF circuits. In this paper, an integrated analog temperature sensor (ATS) which operates with simple, low-cost one-point calibration is proposed. The temperature to voltage conversion is achieved in two steps i.e. temperature to frequency, followed by...
A multiphase, delay-locked loop (DLL) based frequency synthesizer is designed for harmonic rejection mixing in reconfigurable radios. This frequency synthesizer uses a 1 GHz input reference frequency, and achieves ≤ 20ns settling time by utilizing a wide loop bandwidth. The circuit has been designed in 0.13-µm CMOS technology. It is designed for a frequency range of 500 MHz to 3 GHz with stuck/harmonic...
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