A CMOS mixed-signal interface with a RF transmitter for a micromachined soil moisture sensor. Morais, R., Valente, A., Correia, J., H., J., Couto, C., Morais, R., Correia, J., H., J., & Couto, C. In Industrial Electronics, 2003. ISIE '03. 2003 IEEE International Symposium on, volume 2, pages 952-955, 6, 2003. Ieee.
A CMOS mixed-signal interface with a RF transmitter for a micromachined soil moisture sensor [link]Website  doi  abstract   bibtex   
This paper describes a CMOS mixed-signal interface with a RF transmitter. This die is assembled in a multi-chip-module (MCM) micro-system together with the micromachined soil moisture sensor to achieve a cost-effective solution with accurate and reliable measurements for soil moisture in agriculture. The soil moisture probe, based on dual-probe heat-pulse (DPHP) method, is fabricated in bulk-micromachining technology. The DPHP method is based on the measurement of the maximum temperature rise at some distance from the heater, after applying a heat-pulse. The measurement of the temperature rise is obtained by subtracting soil temperature from the probe temperature. The mixed-signal interface Ls based on a pre-amplification stage and first-order sigma-delta modulator. The bit-stream output of the modulator is then applied to a counter as a first order decimation filter thus providing a 12-bit readout sample. Prior to transmission, data is encoded as a pulse width modulated (PWM) signal and then transmitted by means of an amplitude shift-keying (ASK) modulation. The transmitter features a VCO phase locked to the quartz crystal reference of 13.56 MHz to achieve a carrier frequency of 433.92 MHz. A RF power amplifier based on class E topology was chosen. The CMOS mixed-signal interface with a RF transmitter has been implemented in a single-chip using a standard CMOS process (AMI 0.7 ?m, n-well, 2 metals and 1 poly).
@inproceedings{
 title = {A CMOS mixed-signal interface with a RF transmitter for a micromachined soil moisture sensor},
 type = {inproceedings},
 year = {2003},
 keywords = {433.92 MHz,ASK modulation,CMOS integrated circuits,CMOS mixed-signal interface,PWM signal,RF power amplifier,RF transmitter,VCO phase locked,amplitude shift keying,amplitude shift-keying modulation,bulk-micromachining technology,carrier frequency,dual-probe heat-pulse method,first-order sigma-delta modulator,micromachined soil moisture sensor,micromachining,micromechanical devices,mixed analogue-digital integrated circuits,moisture,multichip modules,multichip-module microsystem,probe temperature,pulse width modulation,pulse width modulation signal,quartz crystal reference,sigma-delta,sigma-delta modulation,soil,soil moisture probe,soil temperature,soil-moisture sensors,temperature measurement,temperature rise measurement,voltage-controlled oscillators 13.56 MHz,wireless},
 pages = {952-955},
 volume = {2},
 websites = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=1267950,http://apps.isiknowledge.com/full_record.do?product=UA&search_mode=GeneralSearch&qid=1&SID=N1A58cdn2C@kCAhmIJD&page=2&doc=13},
 month = {6},
 publisher = {Ieee},
 id = {f9ecf90e-4eb4-38a1-a227-fdee5aeb2280},
 created = {2020-04-14T16:15:43.493Z},
 accessed = {2012-07-27},
 file_attached = {false},
 profile_id = {8f53583f-94e1-3d98-83ad-e84ae5eab9e4},
 last_modified = {2020-04-14T16:16:19.402Z},
 read = {true},
 starred = {false},
 authored = {true},
 confirmed = {true},
 hidden = {false},
 citation_key = {1267950},
 source_type = {inproceedings},
 notes = {Article <br/>English},
 folder_uuids = {4226032a-d8d6-102e-ac9a-0024e85ead87},
 private_publication = {false},
 abstract = {This paper describes a CMOS mixed-signal interface with a RF transmitter. This die is assembled in a multi-chip-module (MCM) micro-system together with the micromachined soil moisture sensor to achieve a cost-effective solution with accurate and reliable measurements for soil moisture in agriculture. The soil moisture probe, based on dual-probe heat-pulse (DPHP) method, is fabricated in bulk-micromachining technology. The DPHP method is based on the measurement of the maximum temperature rise at some distance from the heater, after applying a heat-pulse. The measurement of the temperature rise is obtained by subtracting soil temperature from the probe temperature. The mixed-signal interface Ls based on a pre-amplification stage and first-order sigma-delta modulator. The bit-stream output of the modulator is then applied to a counter as a first order decimation filter thus providing a 12-bit readout sample. Prior to transmission, data is encoded as a pulse width modulated (PWM) signal and then transmitted by means of an amplitude shift-keying (ASK) modulation. The transmitter features a VCO phase locked to the quartz crystal reference of 13.56 MHz to achieve a carrier frequency of 433.92 MHz. A RF power amplifier based on class E topology was chosen. The CMOS mixed-signal interface with a RF transmitter has been implemented in a single-chip using a standard CMOS process (AMI 0.7 ?m, n-well, 2 metals and 1 poly).},
 bibtype = {inproceedings},
 author = {Morais, R. and Valente, A. and Correia, JH H J.H. and Couto, C. and Morais, R. and Correia, JH H J.H. and Couto, C.},
 doi = {10.1109/ISIE.2003.1267950},
 booktitle = {Industrial Electronics, 2003. ISIE '03. 2003 IEEE International Symposium on}
}
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