Resonance Frequency Readout Circuit for a 900 MHz SAW Device
A monolithic resonance frequency readout circuit with high resolution and short measurement time is presented for a 900 MHz RF surface acoustic wave (SAW) sensor. The readout circuit is composed of a fractional-N phase-locked loop (PLL) as the stimulus source to the SAW device and a phase-based reso...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2017-09-01
|
| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/17/9/2131 |
| _version_ | 1798034629663391744 |
|---|---|
| author | Heng Liu Chun Zhang Zhaoyang Weng Yanshu Guo Zhihua Wang |
| author_facet | Heng Liu Chun Zhang Zhaoyang Weng Yanshu Guo Zhihua Wang |
| author_sort | Heng Liu |
| collection | DOAJ |
| description | A monolithic resonance frequency readout circuit with high resolution and short measurement time is presented for a 900 MHz RF surface acoustic wave (SAW) sensor. The readout circuit is composed of a fractional-N phase-locked loop (PLL) as the stimulus source to the SAW device and a phase-based resonance frequency detecting circuit using successive approximation (SAR). A new resonance frequency searching strategy has been proposed based on the fact that the SAW device phase-frequency response crosses zero monotonically around the resonance frequency. A dedicated instant phase difference detecting circuit is adopted to facilitate the fast SAR operation for resonance frequency searching. The readout circuit has been implemented in 180 nm CMOS technology with a core area of 3.24 mm2. In the experiment, it works with a 900 MHz SAW resonator with a quality factor of Q = 130. Experimental results show that the readout circuit consumes 7 mW power from 1.6 V supply. The frequency resolution is 733 Hz, and the relative accuracy is 0.82 ppm, and it takes 0.48 ms to complete one measurement. Compared to the previous results in the literature, this work has achieved the shortest measurement time with a trade-off between measurement accuracy and measurement time. |
| first_indexed | 2024-04-11T20:46:52Z |
| format | Article |
| id | doaj.art-1f9212e61474438fb71f79553a192a08 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T20:46:52Z |
| publishDate | 2017-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-1f9212e61474438fb71f79553a192a082022-12-22T04:04:00ZengMDPI AGSensors1424-82202017-09-01179213110.3390/s17092131s17092131Resonance Frequency Readout Circuit for a 900 MHz SAW DeviceHeng Liu0Chun Zhang1Zhaoyang Weng2Yanshu Guo3Zhihua Wang4Tsinghua National Laboratory for Information Science and Technology, Institute of Microelectronics, Tsinghua University, Beijing 100084, ChinaTsinghua National Laboratory for Information Science and Technology, Institute of Microelectronics, Tsinghua University, Beijing 100084, ChinaTsinghua National Laboratory for Information Science and Technology, Institute of Microelectronics, Tsinghua University, Beijing 100084, ChinaTsinghua National Laboratory for Information Science and Technology, Institute of Microelectronics, Tsinghua University, Beijing 100084, ChinaTsinghua National Laboratory for Information Science and Technology, Institute of Microelectronics, Tsinghua University, Beijing 100084, ChinaA monolithic resonance frequency readout circuit with high resolution and short measurement time is presented for a 900 MHz RF surface acoustic wave (SAW) sensor. The readout circuit is composed of a fractional-N phase-locked loop (PLL) as the stimulus source to the SAW device and a phase-based resonance frequency detecting circuit using successive approximation (SAR). A new resonance frequency searching strategy has been proposed based on the fact that the SAW device phase-frequency response crosses zero monotonically around the resonance frequency. A dedicated instant phase difference detecting circuit is adopted to facilitate the fast SAR operation for resonance frequency searching. The readout circuit has been implemented in 180 nm CMOS technology with a core area of 3.24 mm2. In the experiment, it works with a 900 MHz SAW resonator with a quality factor of Q = 130. Experimental results show that the readout circuit consumes 7 mW power from 1.6 V supply. The frequency resolution is 733 Hz, and the relative accuracy is 0.82 ppm, and it takes 0.48 ms to complete one measurement. Compared to the previous results in the literature, this work has achieved the shortest measurement time with a trade-off between measurement accuracy and measurement time.https://www.mdpi.com/1424-8220/17/9/2131sensor readout circuitSAW deviceresonance frequencyphase-locked loopsuccessive approximation |
| spellingShingle | Heng Liu Chun Zhang Zhaoyang Weng Yanshu Guo Zhihua Wang Resonance Frequency Readout Circuit for a 900 MHz SAW Device Sensors sensor readout circuit SAW device resonance frequency phase-locked loop successive approximation |
| title | Resonance Frequency Readout Circuit for a 900 MHz SAW Device |
| title_full | Resonance Frequency Readout Circuit for a 900 MHz SAW Device |
| title_fullStr | Resonance Frequency Readout Circuit for a 900 MHz SAW Device |
| title_full_unstemmed | Resonance Frequency Readout Circuit for a 900 MHz SAW Device |
| title_short | Resonance Frequency Readout Circuit for a 900 MHz SAW Device |
| title_sort | resonance frequency readout circuit for a 900 mhz saw device |
| topic | sensor readout circuit SAW device resonance frequency phase-locked loop successive approximation |
| url | https://www.mdpi.com/1424-8220/17/9/2131 |
| work_keys_str_mv | AT hengliu resonancefrequencyreadoutcircuitfora900mhzsawdevice AT chunzhang resonancefrequencyreadoutcircuitfora900mhzsawdevice AT zhaoyangweng resonancefrequencyreadoutcircuitfora900mhzsawdevice AT yanshuguo resonancefrequencyreadoutcircuitfora900mhzsawdevice AT zhihuawang resonancefrequencyreadoutcircuitfora900mhzsawdevice |