Title :
CMOS surface acoustic wave oscillator with low noise synchronous type readout circuits
Author :
Szu-Chieh Liu ; Kea-Tiong Tang
Author_Institution :
Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
Abstract :
In this paper, we present a synchronous passive surface acoustic wave (SAW) sensor system. The SAW resonator structure is composed of LiNbO3 substrate and Au interdigital transducers (IDT). The center frequency of the SAW sensor is 115MHz. The SAW sensor can be used to detect low concentration of gas by monitoring center frequency shift. In this paper, we designed a low noise CMOS oscillator circuit for the SAW sensor and a frequency readout circuit to calculate the frequency variation. The proposed circuit was fabricated in TSMC 0.18μm 1P6M CMOS process technology. The chip operated at an 1V supply for digital circuits and an 1.8V supply for analog circuits.
Keywords :
CMOS integrated circuits; biomedical engineering; interdigital transducers; surface acoustic wave oscillators; surface acoustic wave resonators; CMOS surface acoustic wave oscillator; SAW resonator structure; SAW sensor system; center frequency shift; interdigital transducers; synchronous type readout circuit; Application specific integrated circuits; CMOS integrated circuits; Phase noise; Radiation detectors; Surface acoustic waves;
Conference_Titel :
Biomedical Circuits and Systems Conference (BioCAS), 2012 IEEE
Conference_Location :
Hsinchu
Print_ISBN :
978-1-4673-2291-1
Electronic_ISBN :
978-1-4673-2292-8
DOI :
10.1109/BioCAS.2012.6418508
