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This paper describes an immunoassay-based biosensor which is composed of a disposable sensor device and a prototype electric reader with 14 × 10 × 4 cm3 in size. The sensor devices are fabricated using a 250 MHz shear horizontal surface acoustic wave (SH-SAW) delay-line on quartz substrates, which is composed of a transmitting interdigital transducer (IDT), receiving IDT, and a biochemical reaction...
In this paper we describe liquid-phase two-channel Shear Horizontal Surface Acoustic Wave (SH-SAW) sensors to detect conductivity and permittivity of the liquids. In the case of the low-permittivity liquids, the SH-SAWs in the delay-line having an unmetallized propagation area can be degraded owing to the lack of SH-SAW energy concentration of the surface. Then the obtained permittivity and conductivity...
The ADC is fabricated in 90 nm digital CMOS process. The chip consumes 34 mW at 300MS/s (fin=fs/2) from 1.2 V analog/digital and 2.5 V T/H-switches supply. At 100 MS/s (fin= fs/2), it consumes 6.7 mW from 0.75 V analog/digital and 1.5 V T/H-switches supplies. FOMs are 780 fJ/conversion-step at 300 MS/s (fin=fs/2), 680fJ/conversion-step at 300MS/s (fin=2MHz), 350 fJ/conversion- step at 100 MS/s (fin=fs/2)...
A wafer-level assembled SAW filter on 36Y-X LiTaO3 with a size of 1.6x0.8 mm is presented. The SAW filter has six solder balls with a size of 0.25 mm diameters. The reason of the use of the 0.25 mm balls is that it is easy to mount the devices onto a printed circuit board using a conventional placement machine. The SAW filter is designed for a GPS RF stage application and has a center frequency of...
This paper describes an SH-SAW based sensor device which can be directly dipped into a liquid. The sensor device is composed of a two-channel SH-SAW delay line on a 36Y-X LiTaO3. Those IDTs are surrounded with epoxy walls with a 50 mum height and a 160 mum thickness. Since the epoxy walls are constructed by a photo-lithography technique using a thick epoxy based photo resist, the thickness of wall...
Developments of sensors using surface acoustic wave (SAW) devices have been attractive. A shear horizontal SAW (SH-SAW) sensor can detect liquid properties and chemical reactions in liquid. For practical applications of the SAW sensor, it is necessary to discuss its properties. In this paper, the SH-SAW sensors with a floating electrode unidirectional transducer (FEUDT) or an interdigital transducer...
One-chip sensor system using two different acoustic waves on ST-cut quartz is presented; one is shear horizontal surface acoustic wave (SH-SAW) and the other is surface acoustic wave (SAW). On the sensor chip, there is a SH-SAW delay-line that is composed of a transmitting interdigital transducer (IDT), receiving IDT and a biochemical reaction area in between them. And there is another IDT on the...
Power flow angles (PFAs) on the langasite (LGS) substrate with Euler angle of (0deg, 138.5deg,Psi), Psi = 25.7deg to 27.7deg are investigated for slanted finger interdigital transducer (SFIT) SAW filters to realize an optimum design. A tilted 380 MHz SFIT SAW filter with an aperture of 40 wavelengths and number of finger pairs of 500 for input and 300 for output is designed for the appropriate PFA...
A 12b 40MS/s 2-step subranging ADC is realized in a 90nm digital CMOS process. It uses a 7b coarse quantizer with a high-gain offset-canceling positive-feedback amplifier. ENOB is 10.2b at a 0.7V supply and 11.0b at a 1.0V supply. The ADC consumes 30mW at 40MS/s
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