Fully differential variable gain instrumentation amplifier based on a fully differential DDA topology

Gano, A.J.; Franca, J.E.

doi:10.1109/icecs.1999.813225

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…3) illustrates the architecture of the feedback circuitry and the comparator, which converts the sinusoidal oscillation signal into a square wave that serves as the input of the digital counter. The variable-gain amplifier [33], which is based on a differential difference amplifier (DDA) [34], provides a tunable gain between 30 and 45 dB by changing one of the bias currents. The possibility to adjust the loop gain is very important because the variation in cantilever properties, such as resonance frequency, quality factor, and peak gain, can reach a maximum of 10% as a consequence of the fabrication spread.…”

Section: Resonant Cantilever and Feedback Circuitrymentioning

confidence: 99%

Monolithic CMOS multi-transducer gas sensor microsystem for organic and inorganic analytes

Li¹,

Vancura²,

Barrettino³

et al. 2007

Sensors and Actuators B: Chemical

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Section: Resonant Cantilever and Feedback Circuitrymentioning

confidence: 99%

Monolithic CMOS multi-transducer gas sensor microsystem for organic and inorganic analytes

Li¹,

Vancura²,

Barrettino³

et al. 2007

Sensors and Actuators B: Chemical

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“…The transistors M1-M2 and M7-M8 are the transistors must have at least V dsat , to offer good common mode rejection ratio and dc gain [8][9].In figure 1, 1 and 2 are the capacitors used for further improvement in the dc gain and bandwidth of the amplifier. In addition to that two load capacitors are employed to further more enhance the DC gain and also the output swing.…”

Section: Architecturementioning

confidence: 99%

Design and Analysis of Low Power Pseudo Differential Class-Ab Telescopic Operational Amplifier

Shylu¹

2014

IJRET

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“…Figure 2 shows the block diagram of the system. The variable-gain amplifier [5] based on a differential difference amplifier (DDA) [6] provides a tunable gain between 30 dB and 45 dB by changing one bias current. The oscillation can only occur, if the loop gain is greater than unity at the frequency where the phase requirement is met.…”

Section: Cantilever Gas Sensor Systemmentioning

confidence: 99%

Advanced chemical microsensor systems in CMOS technology

Vancura²,

Barrettino³

et al.

Proceedings of IEEE Sensors, 2004.

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We report on results achieved with three different chemical microsensor systems featuring three different types of transducers, all of which are monolithically integrated with associated driving and readout circuitry. The capacitive sensor, which is sensitive to changes in dielectric properties of the polymer layer upon analyte absorption, and the cantilever which is sensitive to predominantly mass changes, are two polymer-based gas sensors. An on-chip integrated -converter is used to detect the minute capacitance changes of the capacitive sensor. The cantilever is magnetically excited and its vibration is detected using a piezoresistive Wheatstone bridge. Selfoscillation of the cantilever is achieved through monolithic integration of the feedback circuitry. The third transducer is a microhotplate-based gas sensor, which relies on the resistance changes of a metal oxide upon gas exposure at an operation temperature of 300 -400 o C. The ultimate goal is the monolithic integration of all the different transducers with driving and signal-processing electronics and a digital communication interface on the same single chip.

show abstract

Fully differential variable gain instrumentation amplifier based on a fully differential DDA topology

Cited by 9 publications

References 11 publications

Monolithic CMOS multi-transducer gas sensor microsystem for organic and inorganic analytes

Monolithic CMOS multi-transducer gas sensor microsystem for organic and inorganic analytes

Design and Analysis of Low Power Pseudo Differential Class-Ab Telescopic Operational Amplifier

Advanced chemical microsensor systems in CMOS technology

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