Accurate design of low-noise microwave SAW oscillators

Eichinger, L.; Sischka, F.; Olbrich, G.R.; Weigel, Robert

doi:10.1109/ultsym.2000.922500

Cited by 8 publications

(5 citation statements)

References 3 publications

(3 reference statements)

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“…The setup used for Bcl-2 characterization involves the biosensor, two variable gain RF amplifiers (Olympus 5073PR and Olympus 5072PR, Olympus NDT Inc., Waltham, MA, USA), a digital frequency counter (Agilent 53220A, Agilent Technologies Inc, Santa Clara, CA, USA), an oscillator (Tektronix TDS2001C, Textronix Inc., Beaverton, OR, USA) and the specifically-designed analog filter, as illustrated Figure 5 . Two RF amplifiers were used to enable optimization of the loop gain [ 33 ].…”

Section: Measurement Setup and Resultsmentioning

confidence: 99%

A Urinary Bcl-2 Surface Acoustic Wave Biosensor for Early Ovarian Cancer Detection

Onen

Şişman

Gallant

et al. 2012

Sensors

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In this study, the design, fabrication, surface functionalization and experimental characterization of an ultrasonic MEMS biosensor for urinary anti-apoptotic protein B-cell lymphoma 2 (Bcl-2) detection with sub ng/mL sensitivity is presented. It was previously shown that urinary Bcl-2 levels are reliably elevated during early and late stages of ovarian cancer. Our biosensor uses shear horizontal (SH) surface acoustic waves (SAWs) on surface functionalized ST-cut Quartz to quantify the mass loading change by protein adhesion to the delay path. SH-SAWs were generated and received by a pair of micro-fabricated interdigital transducers (IDTs) separated by a judiciously designed delay path. The delay path was surface-functionalized with monoclonal antibodies, ODMS, Protein A/G and Pluronic F127 for optimal Bcl-2 capture with minimal non-specific adsorption. Bcl-2 concentrations were quantified by the resulting resonance frequency shift detected by a custom designed resonator circuit. The target sensitivity for diagnosis and identifying the stage of ovarian cancer was successfully achieved with demonstrated Bcl-2 detection capability of 500 pg/mL. It was also shown that resonance frequency shift increases linearly with increasing Bcl-2 concentration.

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Section: Measurement Setup and Resultsmentioning

confidence: 99%

A Urinary Bcl-2 Surface Acoustic Wave Biosensor for Early Ovarian Cancer Detection

Onen

Şişman

Gallant

et al. 2012

Sensors

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“…Interdigital transducers (IDTs) were widely used for the electric signal excitation and detection of surface acoustic waves [2]. According to the design parameters from the simulation data of delta function model and cross field model, the SAW device was fabricated, using standard photolithographic technology, onto a LiNbO 3 piezoelectric substrate with IDTs of Cr/Au, 20nm/100nm, operating at 99.8MHz.…”

Section: Surface Acoustic Wave (Saw) Sensormentioning

confidence: 99%

A Portable Electronic Nose Based on Bio-Chemical Surface Acoustic Wave (SAW) Array with Multiplexed Oscillator and Readout Electronics

Tang¹,

Yao²,

Yang³

et al. 2009

AIP Conference Proceedings

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Articles you may be interested inTheoretical investigation of conductivity sensitivities of SiC-based bio-chemical acoustic wave sensors Abstract. We have developed a new portable electronic nose based on a SAW sensor array and its readout electronics. The SAW array is based on 2×2 non-continuously working oscillators for sensors coated with different polymer/mesoporous carbon composite materials. Signals of the SAW array can be obtained by a readout PCB and a microprocessor. Experiments indicate good results for this portable system to perform gas detection and recogntion applications.

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“…When using the oscillator together with the SAW sensor, it is possible to analyze, through variations in the frequency, phase, amplitude and sensitivity of the components, the presence or absence and the amount of the substance being analyzed. Among the oscillators most used in the bibliography, Pierce [18][20] [21], Colpitts [19] and Clapp stand out, with no consensus on the oscillator to be used nor a comparison between different types of oscillators based on a specific parameter to determine the best oscillator to use with the SAW sensor.…”

Section: Introductionmentioning

confidence: 99%

“…In [18], the authors performed computational simulations of a Pierce oscillator with an oscillation frequency of 1.9 GHz using the SAW sensor as the frequency controlling element. The authors aimed to compare the measured and simulated values of the oscillation frequency, output power and phase noise, obtaining differences of 3.33%, 1.22% and 4%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Sinusoidal Oscillators with Surface Acoustic Wave Sensor in the Feedback Loop

Silva,

Carlos Silvério Freire,

Fernandes de Araújo

et al. 2023

JICS

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Surface acoustic wave sensors can be implemented within the feedback loop of sinusoidal oscillators for detecting pollutants. This detection process involves analyzing the variation of oscillator output voltage parameters, such as amplitude and oscillation frequency. However, each oscillator topology has a distinct operating range concerning frequency and component values. Therefore, a comparative analysis is necessary to determine the oscillator with optimal performance to use with the sensor. To obtain results, a surface acoustic wave sensor model was chosen based on a piezoelectric crystal with a resonant frequency of 117.6 MHz, and three sinusoidal oscillator topologies were used: Pierce, Colpitts, and Clapp. The oscillators were simulated with the sensor model in the feedback loop using the Montecarlo method. The simulation occurred in two steps: individually varying each component by +/- 20% with 250 iterations, and simultaneously varying all components by +/- 20% with 1000 iterations. The variables analyzed in the simulations were amplitude, oscillation frequency, and a new parameter indicating the percentage of time there is an oscillation, termed "robustness." As a result, it was determined that all three oscillators generated oscillations in the output voltage, making them viable for use with the sensor. Furthermore, it was discovered that the Clapp oscillator had a robustness of 84.5%, while the Colpitts and Pierce oscillators had a robustness of 56.3% and 49.9%, respectively. Therefore, based on the results presented in this study, the Clapp oscillator is the optimal choice for use with the surface acoustic wave sensor.

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Accurate design of low-noise microwave SAW oscillators

Cited by 8 publications

References 3 publications

A Urinary Bcl-2 Surface Acoustic Wave Biosensor for Early Ovarian Cancer Detection

A Urinary Bcl-2 Surface Acoustic Wave Biosensor for Early Ovarian Cancer Detection

A Portable Electronic Nose Based on Bio-Chemical Surface Acoustic Wave (SAW) Array with Multiplexed Oscillator and Readout Electronics

Comparative Analysis of Sinusoidal Oscillators with Surface Acoustic Wave Sensor in the Feedback Loop

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